View AS5245_8148886.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

AS5245 programmable 360o magnetic angle encoder with absolute ssi and pwm output www.austriamicrosystems.com/AS5245 revision 1.5 1 - 31 data sheet 1 general description the AS5245 is a contactless magnetic angle encoder for accurate measurement up to 360o and includes two as5145 devices in a punched stacked leadframe. it is a system-on-chip, combining integrated hall elements, analog front end and digital signal processing in a single device. to measure the angle, only a simple two-pole magnet, rotating over the center of the chip is required. the magnet may be placed above or below the ic. the absolute angle measurement provides instant indication of the magnet?s angular position with a resolution of 0.0879o = 4096 positions per revolution. this digital data is available as a serial bit stream and as a pwm signal. an internal voltage regulator allows operation of the AS5245 from 3.3v or 5.0v supplies. the AS5245 is fully automotive qualified to aec-q100, grade 0. 2 key features contactless high resolution rotational position encoding over a full turn of 360o two digital 12-bit absolute outputs quadrature a/b (10- or 12-bit) and index output signal user programmable zero position failure detection mode for magnet placement monitoring and loss of power supply ?red-yellow-green? indicators display placement of magnet in z-axis tolerant to magnet misalignment and air gap variations wide temperature range: - 40oc to +150oc unique chip identifier fully automotive qualified to aec-q100, grade 0 small package: qfn 32 ld (7x7) 3 applications the AS5245 is ideal for applications with an angular travel range from a few degrees up to a full turn of 360o. the device is suitable for automotive applications like throttle position sensors, gas/brake pedal position sensing, headlight position control, contactless rotary position sensing, front panel rotary switches and replacement of potentiometer. dsp hall array & frontend amplifier absolute interface (ssi) incremental interface sin cos ang mag magincn magdecn do pwm clk dtest1_a dtest2_b mode_index pdio csn pwm interface otp register vdd5v vdd3v3 ldo 3.3v mux AS5245 note: this block diagram presents only one die figure 1. AS5245 block diagram
www.austriamicrosystems.com/AS5245 revision 1.5 2 - 31 AS5245 data sheet - contents contents 1 general description ......................................................................................................... ......................................................... 1 2 key features................................................................................................................ ............................................................. 1 3 applications................................................................................................................ ............................................................... 1 4 pin assignments ............................................................................................................. .......................................................... 3 4.1 pin descriptions.......................................................................................................... .......................................................................... 4 5 absolute maximum ratings .................................................................................................... .................................................. 5 6 electrical characteristics.................................................................................................. ......................................................... 6 6.1 system specifications ..................................................................................................... ..................................................................... 7 7 timing characteristics ...................................................................................................... ........................................................ 9 8 detailed description........................................................................................................ ........................................................ 10 8.1 mode_index pin............................................................................................................ ...................................................................... 10 8.2 synchronous serial interface (ssi) ........................................................................................ ............................................................ 11 8.2.1 serial data contents.................................................................................................... .............................................................. 11 8.2.2 z-axis range indication (push button feature, red/yellow/green indicator)............................................... ............................ 12 8.2.3 incremental mode ........................................................................................................ .............................................................. 12 8.2.4 sync mode............................................................................................................... .................................................................. 14 8.2.5 sine/cosine mode ........................................................................................................ ............................................................. 14 8.2.6 daisy chain mode ........................................................................................................ ............................................................. 14 8.3 pulse width modulation (pwm) output....................................................................................... ....................................................... 15 8.3.1 changing the pwm frequency.............................................................................................. .................................................... 16 8.4 analog output............................................................................................................. ........................................................................ 16 9 application information ..................................................................................................... ...................................................... 17 9.1 programming the AS5245 .................................................................................................... .............................................................. 17 9.1.1 zero position programming ............................................................................................... ........................................................ 17 9.1.2 otp memory assignment................................................................................................... ....................................................... 18 9.1.3 user selectable settings ................................................................................................ ........................................................... 18 9.1.4 otp default setting..................................................................................................... .............................................................. 19 9.1.5 redundancy.............................................................................................................. ................................................................. 19 9.1.6 redundant programming option ............................................................................................ ................................................... 19 9.2 alignment mode............................................................................................................ ...................................................................... 20 9.3 3.3v / 5v operation ....................................................................................................... ..................................................................... 21 9.4 choosing the proper magnet................................................................................................ .............................................................. 22 9.5 failure diagnostics ....................................................................................................... ...................................................................... 23 9.5.1 magnetic field strength diagnosis ....................................................................................... ..................................................... 23 9.5.2 power supply failure detection .......................................................................................... ...................................................... 23 9.6 angular output tolerances ................................................................................................. ................................................................ 23 9.6.1 accuracy ................................................................................................................ .................................................................... 23 9.6.2 transition noise........................................................................................................ ................................................................. 25 9.6.3 high speed operation .................................................................................................... ........................................................... 25 9.6.4 propagation delays ...................................................................................................... ............................................................. 26 9.6.5 internal timing tolerance ............................................................................................... ........................................................... 26 9.6.6 temperature ............................................................................................................. ................................................................. 26 9.6.7 accuracy over temperature ............................................................................................... ....................................................... 26 9.7 AS5245 differences to as5045.............................................................................................. ............................................................ 27 10 package drawings and markings .............................................................................................. ........................................... 28 11 ordering information ....................................................................................................... ...................................................... 30
www.austriamicrosystems.com/AS5245 revision 1.5 3 - 31 AS5245 data sheet - pin assignments 4 pin assignments figure 2. pin assignments (top view) AS5245 25 26 27 28 29 30 16 15 14 13 12 11 24 23 22 21 20 19 1 2 3 4 5 6 7 8 18 17 31 32 10 9 vss_bottom pdio_top pdio_bottom clk_top clk_bottom do_top do_bottom csn_bottom vdd3v_bottom nc nc nc nc pwm_top pwm_bottom csn_top dtest1_a_top magdecn_bottom magdecn_top magincn_bottom magincn_top vdda5v_top vdda5v_bottom vdd3v_top dtest1_a_bottom dtest2_b_top dtest2_b_bottom nc nc mode_index_top mode_index_bottom vss_top
www.austriamicrosystems.com/AS5245 revision 1.5 4 - 31 AS5245 data sheet - pin assignments 4.1 pin descriptions table 1. pin descriptions pin name pin number pin type description dtest1_a 1, 32 digital output test output in default mode dtest2_b 2, 3 digital output test output in default mode nc 4, 5 - for internal use. must be left unconnected mode_index 6, 7 digital i/o pull-down select between slow (open, low: vss) and fast (high) mode. internal pull- down resistor. hard wired connection to vdd or gnd recommended. vss 8, 9 supply pin negative supply voltage (gnd) pdio 10, 11 digital input pull-down otp programming input and data input for daisy chain mode. internal pull-down resistor (74k ). should be connected to vss if programming is not used. clk 12, 13 digital input, schmitt- trigger input clock input of synchronous serial interface; schmitt-trigger input do 14, 15 digital output / tri- state data output of synchronous serial interface csn 16, 17 digital input pull-up, schmitt-trigger input chip select. active low. schmitt-trigger input, internal pull-up resistor (50k ) pwm 18, 19 digital output pulse width modulation nc 20, 21 - for internal use. must be left unconnected nc 22, 23 - for internal use. must be left unconnected vdd3v3 24, 25 supply pin 3v-regulator output for internal core, regulated from vdd5v. connect to vdd5v for 3v supply voltage. do not load externally. vdd5v 26, 27 supply pin positive supply voltage, 3.0v to 5.5v magincn 28, 29 digital output open drain magnet field magnitude increase. active low. indicates a distance reduction between the magnet and the device surface. magdecn 30, 31 digital output open drain magnet field magni tude decrease. active low. indicates a distance increase between the device and the magnet.
www.austriamicrosystems.com/AS5245 revision 1.5 5 - 31 AS5245 data sheet - absolute maximum ratings 5 absolute maximum ratings stresses beyond those listed in table 2 may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in electrical characteristics on page 6 is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. table 2. absolute maximum ratings parameter min max units comments dc supply voltage at pin vdd5v -0.3 7 v dc supply voltage at pin vdd3v3 -0.3 5 v input pin voltage -0.3 7 v pins prog, magincn, magdecn, clk, csn input current (latchup immunity) -100 100 ma norm: eia/jesd78 class ii level a electrostatic discharge 2 kv norm: jesd22-a114e storage temperature -55 +150 oc body temperature (lead-free package) 260 oc t=20 to 40s, norm: ipc/jedec j-std-020c lead finish 100% sn ?matte tin? humidity non-condensing 5 85 % ambient temperature -40 150 oc
www.austriamicrosystems.com/AS5245 revision 1.5 6 - 31 AS5245 data sheet - electrical characteristics 6 electrical characteristics t amb = -40 to +150oc, v dd 5v = 3.0-3.6v (3v operation) vdd5v = 4.5-5.5v (5v operation) unless otherwise noted. table 3. electrical characteristics symbol parameter condition min typ max unit operating conditions t amb ambient temperature -40 +150 oc i supp supply current (one die only) 16 21 ma v dd 5v supply voltage at pin v dd 5v 5v operation 4.5 5.0 5.5 v v dd 3v3 voltage regulator output voltage at pin v dd 3v3 3.0 3.3 3.6 v dd 5v supply voltage at pin v dd 5v 3.3v operation (pin v dd 5v and v dd 3v3 connected) 3.0 3.3 3.6 v v dd 3v3 supply voltage at pin v dd 3v3 3.0 3.3 3.6 v on power-on reset thresholds on voltage; 300mv typ. hysteresis dc supply voltage 3.3v ( v dd 3v3) 1.37 2.2 2.9 v v off power-on reset thresholds off voltage; 300mv typ. hysteresis 1.08 1.9 2.6 programming conditions v prog programming voltage voltage applied during programming 3.3 3.6 v v progoff programming voltage off level line must be discharged to this level 0 1 v i prog programming current current during programming 100 ma r programmed programmed fuse resistance (log 1) 10a maximum current@100mv 100k ? r unprogrammed unprogrammed fuse resistance (log 0) 2ma maximum current@100mv 50 100 dc characteristics cmos schmitt-trigger i nputs: clk, csn (csn = internal pull-up) v ih high level input voltage normal operation 0.7 * v dd 5v v v il low level input voltage 0.3 * v dd 5v v v ion- v ioff schmitt trigger hysteresis 1 v i leak input leakage current clk only -1 1 a i il pull-up low level input current csn only, v dd 5v: 5.0v -30 -100 dc characteristics cmos / program input: pdio v ih high level input voltage 0.7 * v dd 5v v dd 5v v v prog high level input voltage during programming, either with 3.3v or 5v supply 3.3 3.6 v v il low level input voltage 0.3 * v dd 5v v i il high level input current v dd 5v: 5.5v 30 100 a dc characteristics cmos output open drain: magincn, magdecn i oz open drain leakage current 1 a v ol low level output voltage v ss +0.4 v
www.austriamicrosystems.com/AS5245 revision 1.5 7 - 31 AS5245 data sheet - electrical characteristics 6.1 system specifications t amb = -40 to +150oc, v dd 5v = 3.0 to 3.6v (3v operation) vdd5v = 4.5 to 5.5v (5v operation) unless otherwise noted. i o output current v dd 5v: 4.5v 4 ma v dd 5v: 3v 2 dc characteristics cmos output: pwm v oh high level output voltage v dd 5v? 0.5 v v ol low level output voltage v ss +0.4 v i o output current v dd 5v: 4.5v 4 ma v dd 5v: 3v 2 dc characteristics cmos output: a, b, index v oh high level output voltage v dd 5v? 0.5 v v ol low level output voltage v ss +0.4 v i o output current v dd 5v: 4.5v 4 ma v dd 5v: 3v 2 dc characteristics tri-state cmos output: do v oh high level output voltage v dd 5v? 0.5 v v ol low level output voltage v ss +0.4 v i o output current v dd 5v: 4.5v 4 ma v dd 5v: 3v 2 i oz tri-state leakage current 1 a table 4. input specification symbol parameter condition min typ max unit res resolution 0.088 deg 12 bit inl opt integral non-linearity (optimum) maximum error with respect to the best line fit. centered magnet without calibration, t amb =25oc. 0.5 deg inl temp integral non-linearity (optimum) maximum error with respect to the best line fit. centered magnet without calibration, t amb = -40 to +150 o c 0.9 deg inl integral non-linearity best line fit = (err max ? err min ) / 2 over displacement tolerance with 6mm diameter magnet, without calibration, t amb = -40 to +150oc 1.4 deg dnl differential non-linearity 12bit, no missing codes 0.044 deg tn transition noise 1 sigma, fast mode (mode = 1) 0.06 deg rms 1 sigma, slow mode (mode = 0 or open) 0.03 table 3. electrical characteristics symbol parameter condition min typ max unit
www.austriamicrosystems.com/AS5245 revision 1.5 8 - 31 AS5245 data sheet - electrical characteristics figure 3. integral and differential non-linearity example integral non-linearity (inl) is the maximum deviation between actual position and indicated position. differential non-linearity (dnl) is the maximum deviation of the step length from one position to the next. transition noise (tn) is the repeatability of an indicated position. t pwrup power-up time fast mode (mode = 1); until status bit ocf = 1 20 ms slow mode (mode = 0 or open); until ocf = 1 80 t delay system propagation delay absolute output : delay of adc, dsp and absolute interface fast mode (mode = 1) 96 s slow mode (mode = 0 or open) 384 f s internal sampling rate for absolute output: t amb = 25 o c, slow mode (mode=0 or open) 2.48 2.61 2.74 khz t amb = -40 to +150 o c, slow mode (mode=0 or open) 2.35 2.61 2.87 f s internal sampling rate for absolute output t amb = 25 o c, fast mode (mode = 1) 9.90 10.42 10.94 khz t amb = -40 to +150 o c, fast mode (mode=1) 9.38 10.42 11.46 clk/sel read-out frequency maximum clock frequency to read out serial data 1mhz table 4. input specification symbol parameter condition min typ max unit 180 360 0 0 512 1023 10bit code 0 1 2 0.35 inl ideal curve actual curve tn 512 1023 dnl+1lsb [degrees]
www.austriamicrosystems.com/AS5245 revision 1.5 9 - 31 AS5245 data sheet - timing characteristics 7 timing characteristics t amb = -40 to +150oc, vdd5v= 3.0 to 3.6v (3v operation) vdd5 v= 4.5 to 5.5v (5v operation), unless otherwise noted. table 5. timing characteristics symbol parameter conditions min typ max units synchronous serial interface (ssi) t doactive data output activated (logic high) time between falling edge of csn and data output activated 100 ns t clkfe first data shifted to output register time between falling edge of csn and first falling edge of clk 500 ns t clk/2 start of data output rising edge of clk shifts out one bit at a time 500 ns t dovalid data output valid time between rising edge of clk and data output valid 413 ns t dotristate data output tri-state after the last bit do changes back to ?tri- state? 100 ns t csn pulse width of csn csn =high; to initiate read-out of next angular position 500 ns f clk read-out frequency clock frequency to read out serial data >0 1 mhz pulse width modulation output f pwm pwm frequency signal period = 4098s 10% at t amb = -40 to +150oc 220 244 268 hz pw min minimum pulse width position 0d; angle 0 degree 0.90 1 1.10 s pw max maximum pulse width position 4098d; angle 359.91 degrees 3686 4096 4506 s programming conditions t prog programming time per bit time to prog. a singe fuse bit 10 20 s t charge refresh time per bit time to charge the cap after t prog 1s f load load frequency data can be loaded at n x 2s 500 khz f read read frequency read the data from the latch 2.5 mhz f write write frequency write the data to the latch 2.5 mhz
www.austriamicrosystems.com/AS5245 revision 1.5 10 - 31 AS5245 data sheet - detailed description 8 detailed description the AS5245 is manufactured in a cmos standard process and uses a spinning current hall technology for sensing the magnetic fiel d distribution across the surface of the chip. the integrated hall elements are placed around the center of the device and delive r a voltage representation of the magnetic field at the surface of the ic. through sigma-delta analog / digital conversion and digital signal-processing (dsp) algorithms, the AS5245 provides accurate hi gh-resolution absolute angular position information. for this purpose, a coordinate rotation digital computer (cordic) calculates the angle a nd the magnitude of the hall array signals. the dsp is also used to provide digital information at the outputs magincn and magdecn tha t indicate movements of the used magnet towards or away from the device?s surface. a small low cost diametrically magnetized (two-pole) st andard magnet provides the angular position information (see figure 16) . the AS5245 senses the orientation of the magnetic field and calculates a 12-bit binary code. this code can be accessed via. a s ynchronous serial interface (ssi). in addition, an absolute angular representation is given by a pulse width modulated signal at pin 12 (p wm). this pwm signal output also allows the generation of a direct proportional analog voltage, by using an external low-pass-filter. the as5 245 is tolerant to magnet misalignment and magnetic stray fields due to differential measurement technique and hall sensor conditioning circuitry. figure 4. typical arrangement of AS5245 and magnet 8.1 mode_index pin the mode_index pin activates or deactivates an internal filter that is used to reduce the analog output noise. activating the f ilter (mode pin = low or open) provides a reduced output noise of 0.03o rms. at the same time, the output delay is increased to 384s. this mode is recommended for high precision, low speed applications. deactivating the filter (mode pin = high) reduces the output delay to 96s and provides an output noise of 0.06o rms. this mode is recommended for higher speed applications. setting up the mode pin affects the following parameters: note: a change of the mode during operation is not allowed. the setup must be constant during power up and during operation. table 6. slow and fast mode parameters parameter slow mode (mode=low or open) fast mode (mode=high, v dd =5v) sampling rate 2.61 khz (384 s) 10.42 khz (96s) transition noise (1 sigma) 0.03o rms 0.06o rms output delay 384s 96s maximum speed @ 4096 samples/rev 38 rpm 153 rpm maximum speed @ 1024 samples/rev 153 rpm 610 rpm maximum speed @ 256 samples/rev 610 rpm 2441 rpm maximum speed @ 64 samples/rev 2441 rpm 9766 rpm
www.austriamicrosystems.com/AS5245 revision 1.5 11 - 31 AS5245 data sheet - detailed description 8.2 synchronous serial interface (ssi) figure 5. synchronous serial interface with absolute angular position data if csn changes to logic low, data out (do) will change from high impedance (tri-state) to logic high and the read-out will be i nitiated. after a minimum time t clk fe , data is latched into the output shift register with the first falling edge of clk. each subsequent rising clk edge shifts out one bit of data. the serial word contains 18 bits, the first 12 bits are the angular information d[11:0], the subsequent 6 bits contain system i nformation, about the validity of data such as ocf, cof, lin, parity and magnetic field status (increase/decrease). a subsequent measurement is initiated by a ?high? pulse at csn with a minimum duration of t csn . 8.2.1 serial data contents d11:d0 ? absolute angular position data (msb is clocked out first). ocf ? (offset compensation finished). logic high indicates the finished offset compensation algorithm. cof ? (cordic overflow). logic high indicates an out of range error in the cordic part. when this bit is set, the data at d9:d0 is invalid. the absolute output maintains the last valid angular value. this alarm may be resolved by bringing the magnet within the x-y-z tole rance limits. lin ? (linearity alarm). logic high indicates that the input field generates a critical output linearity. when this bit is set, th e data at d9:d0 may still be used, but can contain invalid data. this warning may be resolved by bringing the magnet within the x-y-z tolerance limits. even parity ? bit for transmission error detection of bits 1?17 (d11?d0, oc f, cof, lin, maginc, magdec). placing the magnet above the chip, angular values increase in clockwise direction by default. data d11:d0 is valid, when the status bits have the following configurations: note: maginc=magdec=1 is only recommended in yellow mode (see table 8) table 7. status bit outputs ocf cof lin mag inc mag dec parity 10 0 00 even checksum of bits 1:15 01 10 11 csn clk do t do valid angular position data t do active status bits t do tristate t csn t clkfe t clkfe t clk/2 1 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 ocf cof lin mag inc mag dec even par 818 1 d11 d10 d11
www.austriamicrosystems.com/AS5245 revision 1.5 12 - 31 AS5245 data sheet - detailed description 8.2.2 z-axis range indication (push button feature, red/yellow/green indicator) the AS5245 provides several options of detecting movement and distance of the magnet in the z-direction. signal indicators magi ncn and magdecn are available both as hardware pins (pins #1 and 2) and as status bits in the serial data stream (see figure 5) . additionally, an otp programming option is available with bit magcompen that enables additional features: in the default state, the status bits maginc, magdec and pins magincn, magdecn have the following function: note: pin 1 (magincn) and pin 2 (magdecn) are active low via. open drain output and require an external pull-up resistor. if the magn etic field is in range, both outputs are turned off. the two pins may also be combined with a single pull-up resistor. in this case, the signal is high when the magnetic field is i n range. it is low in all other cases (see table 8) . 8.2.3 incremental mode the AS5245 has an internal interpolator block. this function is used if the input magnetic field is too fast and a code positio n is missing. in this case an interpolation is done. with the otp bits outputmd0 and outputmd1 a specific mode can be selected. for the available pre-programmed incremental version s (10bit and 12bit), these bits are set during test at austriamicrosystems. these settings are permanent and can not be recovered. a change of the incremental mode (write command) during operation could cause problems. a power-on-reset in between is recommen ded. during operation in incremental mode it is recommended setting csn = high, to disable the ssi-interface. table 8. magnetic field strength red-yellow-green indicator (otp option) status bits hardware pins opt: mag compen = 1 (red-yellow-green programming option) mag inc mag dec lin mag incn mag decn description 000offoff no distance change magnetic input field ok (green range, ~45?75mt) 110onoff yellow range: magnetic field is ~ 25?45mt or ~75?135mt. the AS5245 may still be operated in this range, but with slightly reduced accuracy. 111onon red range: magnetic field is ~<25mt or >~135mt. it is still possible to operate the AS5245 in the red range, but not recommended. all other combinations n/a n/a not available table 9. incremental resolution mode description output md1 output md0 resolution dtest1_a and dtest2_b pulses index width default mode AS5245 function dtest1_a and dtest2_b are not used. the mode_index pin is used for selection of the decimation rate (low speed/high speed). 00 10 bit incremental mode (low dnl) dtest1_a and dtest2_b are used as a and b signal. in this mode the mode_index pin is switched from input to output and will be the index pin. the decimation rate is set to 64 (fast mode) and cannot be changed from external. 0 1 10 256 1/3 lsb 12 bit incremental mode (high dnl) 1 0 12 1024 sync mode in this mode a control signal is switched to dtest1_a and dtest2_b . 11
www.austriamicrosystems.com/AS5245 revision 1.5 13 - 31 AS5245 data sheet - detailed description figure 6. incremental output the hysteresis trimming is done at the final test (factory trimming) and set to 4 lsb, related to a 12 bit number. incremental output hysteresis. to avoid flickering incremental outputs at a stationary magnet position, a hysteresis is introduced. in case of a rotational direction change, the incremental outputs have a hysteresis of 4 lsb. regardless of the programmed incremental resolution, the hysteresis of 4 lsb always corresponds to the highest resolution of 12 bit. in absolute terms, the hysteresis is set to 0.35 de grees for all resolutions. for constant rotational directions, every magnet position change is indicated at the incremental outputs (see figure 7) . for example, if the magnet turns clockwise from position ?x+3? to ?x+4?, the incremental output would also indicate this position accordingl y. a change of the magnet?s rotational direction back to position ?x+3? means that the incremental output still remains unchanged for the duration of 4 lsb, until position ?x+2?is reached. following this direction, the incremen tal outputs will again be updated with every change of the magn et position. figure 7. hysteresis window for incremental outputs mode_index d test2_b d test1_a 1 lsb programmed zero position clockwise 3 lsb counter clockwise magnet position hysteresis : 0.35 x +2 incremental output indication clockwise direction counterclockwise direction x +4 x x x +2 x +4 x +5 x +3 x +1 x +1 x +3 x +6 x +5 x +6
www.austriamicrosystems.com/AS5245 revision 1.5 14 - 31 AS5245 data sheet - detailed description incremental output validity. during power on the incremental output is kept stable high until the offset compensation is finished and the csn is low (internal pull up) the first time. in quadrature mode a = b = index = high indicates an invalid output. if the inter polator recognizes a difference larger than 128 steps between two samples, it holds the last valid state. the interpolator synchronizes up again wit h the next valid difference. this avoids undefined output burst, e.g. if no magnet is present. 8.2.4 sync mode this mode is used to synchronize the external electronic with the AS5245. in this mode, two signals are provided at the pins dt est1_a and dtest2_b. by setting of md0=1 and md1=1 in the otp register, the sync mode will be activated. figure 8. dtest1_a and dtest2_b every rising edge at dtest1_a indicates that new data in the device is available. with this signal it is possible to trigger an external customer microcontroller (interrupt) and start the ssi readout. dtest2_b indicates the phase of available data. 8.2.5 sine/cosine mode this mode can be enabled by setting the otp factory-bit fs2. if this mode is activated, the 16 bit sinus and 16 bit cosines dig ital data of both channels will be switched out. due to the high resolution of 16 bits of the data stream, an accurate calculation can be done ex ternally. in this mode, the open drain outputs of dtest1_a and dtest2_b are switched to push-pull mode. at pin magdecn the clock impulse, at pin magincn the enable pulse will be switched out. the pin pwm indicates, which phase of signal is being presented. the mode is not available in the default mode. 8.2.6 daisy chain mode the daisy chain mode allows connection of several AS5245s in series, while still keeping just one digital input for data transf er (see ?data in? in figure 9 ). this mode is accomplished by connecting the data output (do; pin 9) to the data input (pdio; pin 8) of the subsequent device . the serial data of all connected devices is read from the do pin of the first device in the chain. the length of the serial bit str eam increases with every connected device, it is n * (18+1) bits: n= number of devices. e.g. 38 bit for two devices, 57 bit for three devices, etc. the last data bit of the first device (parity) is followed by a dummy bit and the first data bit of the second device (d11), et c. (see figure 10) . figure 9. daisy chain hardware configuration dtest1_a dtest1_b 400s (100s) csn csn csn csn clk clk clk clk data in AS5245 top die AS5245 bottom die AS5245 top die c do do do pdio pdio pdio
www.austriamicrosystems.com/AS5245 revision 1.5 15 - 31 AS5245 data sheet - detailed description figure 10. daisy chain mode data transfer 8.3 pulse width modul ation (pwm) output the AS5245 provides a pulse width modulated output (pwm), whose duty cycle is proportional to the measured angle. for angle pos ition 0 to 4094: position = (eq 1) examples: 1. an angle position of 180o will generate a pulse width ton = 2049s and a pause t off of 2049 s resulting in position = 2048 after the calculation: 2049 * 4098 / (2049 + 2049) -1 = 2048 2. an angle position of 359.8o will generate a pulse width ton = 4095s and a pause t off of 3 s resulting in position = 4094 after the cal- culation: 4095 * 4098 / (4095 + 3) -1 = 4094 exception: 1. an angle position of 359.9o will generate a pulse width ton = 4097s and a pause t off of 1 s resulting in position = 4096 after the cal- culation: 4097 * 4098 / (4097 + 1) -1 = 4096 the pwm frequency is internally trimmed to an accuracy of 5% (10% over full temperature range). this tolerance can be cancell ed by measuring the complete duty cycle as shown above. figure 11. pwm output signal csn clk do t do valid angular position data t do active status bits t clk fe t clk/2 1 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 ocf cof lin mag inc mag dec even par 8 18 d d11 1 2 3 d10 d9 angular position data 1 st device 2 nd device d10 d11 t on 4098 ? t on t off + () ------------------------- 1 ? 4097s 4096s 1/f pwm pw max pw min 359.91 deg (pos 4095) 0 deg (pos 0) angle 1s
www.austriamicrosystems.com/AS5245 revision 1.5 16 - 31 AS5245 data sheet - detailed description 8.3.1 changing the pwm frequency the pwm frequency of the AS5245 can be divided by two by setting a bit (pwmhalfen) in the otp register (see programming the AS5245 on page 17) . with pwmhalfen = 0, the pwm timing is as shown in table 10 : when pwmhalfen = 1, the pwm timing is as shown in table 11 : 8.4 analog output an analog output can be generated by averaging the pwm signal, using an external active or passive low pass filter. the analog output voltage is proportional to the angle: 0o= 0v; 360o = vdd5v. using this method, the AS5245 can be used as direct replacement of potentiometers. figure 12. simple 2nd order passive rc low pass filter figure 12 shows an example of a simple passive low pass filter to generate the analog output. r1,r2 4k7 c1,c2 1f / 6v (eq 2) r1 should be greater than or equal to 4k7 to avoid loading of the pwm output. larger values of rx and cx will provide better fi ltering and less ripple, but will also slow down the response time. table 10. pwm signal parameters (default mode) symbol parameter typ unit note f pwm pwm frequency 244 hz signal period: 4097s pw min min pulse width 1 s - position 0d - angle 0 deg pw max max pulse width 4096 s - position 4095d - angle 359,91 deg table 11. pwm signal parameters with half frequency (otp option) symbol parameter typ unit note f pwm pwm frequency 122 hz - position 0d - angle 0 deg pw min min pulse width 2 s - position 4095d - angle 359,91 deg pw max max pulse width 8192 s - position 0d - angle 0 deg r1 r2 analog out pin12 pwm pin7 vss c1 c2 vdd 0v 0o 360o
www.austriamicrosystems.com/AS5245 revision 1.5 17 - 31 AS5245 data sheet - application information 9 application information the benefits of AS5245 are as follows: complete system-on-chip angle measurement with programmable range up to 360o high reliability due to non-contact magnetic sensing ideal for applications in harsh environments robust system, tolerant to magnet misalignment, airgap variations, temperature variations and external magnetic fields no calibration required building of redundancy systems with plausibility checks 9.1 programming the AS5245 after power-on, programming the AS5245 is enabled with the rising edge of csn with pdio = high and clk = low. the AS5245 programming is a one-time programming (otp) method, based on poly silicon fuses. the advantage of this method is tha t a programming voltage of only 3.3v to 3.6v is required for programming. the otp consists of 52 bits, of which 21 bits are available for user programming. the remaining 31 bits contain factory setting s and a unique chip identifier (chip-id). a single otp cell can be programmed only once. per default, the cell is ?0?; a programmed cell will contain a ?1?. while it is not possible to reset a programmed bit from ?1? to ?0?, multiple otp writes are possi ble, as long as only unprogrammed ?0?-bits are programmed to ?1? . independent of the otp programming, it is possible to overwrite t he otp register temporarily with an otp write command at any t ime. this setting will be cleared and overwritten with the hard programmed ot p settings at each power-up sequence or by a load operation. use application note an514x_10 to get more information about the programming options. the otp memory can be accessed in the following ways: load operation: the load operation reads the otp fuses and loads the contents into the otp register. a load operation is automatically executed after each power-on-reset. write operation: the write operation allows a temporary modification of the otp register. it does not program the otp. this operation can be invoked multiple times and will remain set while the chip is supplied with power and while the otp register is not modified with another write or load operation. read operation: the read operation reads the contents of the otp register, for example to verify a write command or to read the otp memory after a load command. program operation: the program operation writes the contents of the otp register permanently into the otp rom. analog readback operation: the analog readback operation allows a quantifiable verification of the programming. for each programmed or unprogrammed bit, there is a representative analog value (in essence, a resistor value) that is read to verify wh ether a bit has been successfully programmed or not. 9.1.1 zero position programming zero position programming is an otp option that simplifies assembly of a system, as the magnet does not need to be manually adj usted to the mechanical zero position. once the assembly is completed, the mechanical and electrical zero positions can be matched by softwa re. any position within a full turn can be defined as the permanent new zero position. for zero position programming, the magnet is turned to the mechanical zero position (e.g. the ?off?-position of a rotary switch ) and the actual angular value is read. this value is written into the otp register bits z35:z46. note: the zero position value may also be modified before programming, e.g. to program an electrical zero position that is 180o (half turn) from the mechanical zero position, just add 2048 to the value read at the mechanical zero position and program the new value in to the otp register.
www.austriamicrosystems.com/AS5245 revision 1.5 18 - 31 AS5245 data sheet - application information 9.1.2 otp memory assignment 9.1.3 user selectable settings the AS5245 allows programming of the following user selectable options: - pwmhalfen_indexwidth : setting this bit, the pwm pulse will be divided by 2, in case of quadrature incremental mode a/b/index setting of index impulse width from 1 lsb to 3lsb. - magcompen: the green/yellow mode can be enabled by setting of this bit. - output md0: setting this bit enables sync- or 10bit incremental mode (see table 9) . it is already set by austriamicrosystems. - output md1: setting this bit enables sync- or 12bit incremental mode (see table 9) - z [11:0]: programmable zero / index position - ccw: counter clockwise bit ccw=0 ? angular value increases in clockwise direction ccw=1 ? angular value increases in counterclockwise direction - ra [4:0]: redundant address: an otp bit location addressed by this address is always set to ?1? independent of the corresponding original otp bit setting table 12. otp bit assignment bit symbol function mbit1 factory bit 1 51 pwmhalfen_index width pmw frequency index pulse width customer section 50 magcompen alarm mode 49 pwmdis disable pwm 48 output md0 default, 10 bit inc, 12 bit inc 47 output md1 sync mode 46 z0 12 bit zero position :: 35 z11 34 ccw direction 33 ra0 redundancy address :: 29 ra4 28 fs 0 factory bit factory section 27 fs 1 26 fs 2 25 fs 3 24 fs 4 23 fs 5 :: 20 fs 9 17 chipid0 18 bit chip id id section 16 chipid1 :: 0chipid17 mbit0 factory bit 0
www.austriamicrosystems.com/AS5245 revision 1.5 19 - 31 AS5245 data sheet - application information 9.1.4 otp default setting the AS5245 can also be operated without programming. the default, un-programmed setting is: - output md0, output md1: 00= default mode - z0 to z11: 00 = no programmed zero position - ccw: 0 = clockwise operation - ra4 to ra0: 0 = no otp bit is selected - magcompen: 1 = the green / yellow mode is enabled. 9.1.5 redundancy for a better programming reliability, a redundancy is implemented. this function can be used in cases where the programming of one bit fails. with an address ra(4:0), one bit can be selected and programmed. 9.1.6 redundant programming option in addition to the regular programming, a redundant programming option is available. this option allows that one selectable otp bit can be set to ?1? (programmed state) by writing the location of that bit into a 5-bit address decoder. this address can be stored in bits ra4?ra0 in the otp user settings. example: setting ra4?0 to ?00001? will select bit 51 = pwhalfen_indexwidth, ?00010? selects bit 50 = magcompen, ?10010? selects bit 34 =ccw, etc. table 13. redundancy addressing address pwmhalfen_indexwidth magcompen pwmdis output md0 output md1 z0 z1 z2 z3 z4 z5 z6 z7 z8 z9 z10 z11 ccw 00000 00000000000000000 0 00001 1 0000000000000000 0 00010 0 1 000000000000000 0 00011 0 0 1 00000000000000 0 00100 0 0 0 1 0000000000000 0 00101 0000 1 000000000000 0 00110 00000 1 00000000000 0 00111 000000 1 0000000000 0 01000 0000000 1 000000000 0 01001 00000000 1 00000000 0 01010 000000000 1 0000000 0 01011 0000000000 1 000000 0 01100 00000000000 1 00000 0 01101 000000000000 1 0000 0 01110 0000000000000 1 000 0 01111 00000000000000 1 00 0 10000 000000000000000 1 00 10001 0000000000000000 1 0 10010 00000000000000000 1 10101 11111111111111111 1
www.austriamicrosystems.com/AS5245 revision 1.5 20 - 31 AS5245 data sheet - application information 9.2 alignment mode the alignment mode simplifies centering the magnet over the center of the chip to gain maximum accuracy. alignment mode can be enabled with the falling edge of csn while pdio = logic high (see figure 13) . the data bits d11-d0 of the ssi change to a 12-bit displacement amplitude output. a high value indicates large x or y displacement, but also higher absolute magnetic fie ld strength. the magnet is properly aligned, when the difference between highest and lowest value over one full turn is at a minimum. under normal conditions, a properly aligned magnet will result in a reading of less than 128 over a full turn. the magincn and magdecn indicators will be = 1 when the alignment mode reading is < 128. at the same time, both hardware pins m agincn (#1) and magdecn (#2) will be pulled to vss. a properly aligned magnet will therefore produce a magincn = magdecn = 1 signal th roughout a full 360o turn of the magnet. stronger magnets or short gaps between magnet and ic may show va lues larger than 128. these magnets are still properly aligned as long as the difference between highest and lowest value over one full turn is at a minimum. the alignment mode can be reset to normal operation by a power-on-reset (disconnect / re-connect power supply) or by a falling edge on csn with pdio = low. figure 13. enabling the alignment mode figure 14. exiting alignment mode pdio csn alignmode enable read-out via ssi 2s min. 2s min. pdio csn exit alignmode read-out via ssi
www.austriamicrosystems.com/AS5245 revision 1.5 21 - 31 AS5245 data sheet - application information 9.3 3.3v / 5v operation the AS5245 operates either at 3.3v 10% or at 5v 10%. this is made possible by an internal 3.3v low-dropout (ldo) voltage regu lator. the internal supply voltage is always taken from the output of the ldo, meaning that the internal blocks are always operating at 3. 3v. for 3.3v operation, the ldo must be bypassed by connecting vdd3v3 with vdd5v (see figure 15) . for 5v operation, the 5v supply is connected to pin vdd5v, while vdd3v3 (ldo output) must be buffered by a 1...10f capacitor, which is supposed to be placed close to the supply pin (see figure 15) . note: the vdd3v3 output is intended for internal use only. it must not be loaded with an external load. the output voltage of the digital interface i/o?s corresponds to the voltage at pin vdd5v, as the i/o buffers are supplied from this pin. figure 15. connections for 5v / 3.3v supply voltages a buffer capacitor of 100nf is recommended in both cases close to pin vdd5v. note that pin vdd3v3 must always be buffered by a capacitor. it must not be left floating, as this may cause an instable internal 3.3v supply voltage, which may lead to larger than normal jit ter of the measured angle. internal vdd ldo i n t e r f a c e vss vdd5v vdd3v3 100n 4.5 - 5.5v + - 1... 10f do pwm clk csn pdio internal vdd ldo i n t e r f a c e vss vdd5v vdd3v3 3.0 - 3.6v + - do pwm clk csn pdio 100n 5v operation 3.3v operation
www.austriamicrosystems.com/AS5245 revision 1.5 22 - 31 AS5245 data sheet - application information 9.4 choosing the proper magnet typically, the magnet should be 6mm in diameter and 2.5mm in height. magnetic materials such as rare earth alnico/smco5 or ndfeb are recommended. the magnetic field strength perpendicular to the die surface has to be in the range of 45mt?75mt (peak). the magnet?s field strength should be verified using a gauss-meter. the magnetic field b v at a given distance, along a concentric circle with a radius of 1.1mm (r1), should be in the range of 45mt?75mt (see figure 16) . figure 16. typical magnet (6x3mm) and magnetic field distribution magnet axis vertical field component (45?75mt) 0 360 360 bv vertical field component r1 concentric circle; radius 1.1mm r1 magnet axis typ. 6mm diameter s n
www.austriamicrosystems.com/AS5245 revision 1.5 23 - 31 AS5245 data sheet - application information 9.5 failure diagnostics the AS5245 also offers several diagnostic and failure detection features, which are discussed in detail further in the document . 9.5.1 magnetic field strength diagnosis by software: the maginc and magdec status bits will both be high when the magnetic field is out of range. by hardware: pins #1 (magincn) and #2 (magdecn) are ope n-drain outputs and will both be turned on (= low with external pull-up resistor) when the magnetic field is out of range. if only one of the outputs are low, the magnet is either moving towards the chip (magi ncn) or away from the chip (magdecn). 9.5.2 power supply failure detection by software: if the power supply to the AS5245 is interrupted, the digital data read by the ssi will be all ?0?s. data is only valid, when bit ocf is high, hence a data stream with all ?0?s is invalid. to ensure adequate low levels in the failure case, a pull-down resistor (~1 0k ) should be added between pin dio and vss at the receiving side. by hardware: the magincn and magdecn pins are open drain outputs and require external pull-up resistors. in normal operation, these pins are high ohmic and the outputs are high (see table 8) . in a failure case, either when the magnetic field is out of range of the power supply is missing, these outputs will become low. to ensure adequate low levels in case of a broken power supply to the AS5245, the pull- up resistors (~10k ) from each pin must be connected to the positive supply at pin 16 (vdd5v). by hardware, pwm output: the pwm output is a constant stream of pulses with 1khz repetition frequency. in case of power loss, these pulses are missing. 9.6 angular output tolerances 9.6.1 accuracy accuracy is defined as the error between measured angle and actual angle. it is influenced by several factors: the non-linearity of the analog-digital converters, internal gain and mismatch errors, non-linearity due to misalignment of the magnet. as a sum of all these errors, the accuracy with centered magnet = (err max ? err min )/2 is specified as better than 0.5 degrees @ 25oc (see figure 19) . misalignment of the magnet further reduces the accuracy. figure 18 shows an example of a 3d-graph displaying non-linearity over xy- misalignment. the center of the square xy-area corresponds to a centered magnet (see dot in the center of the graph). the x- an d y- axis extends to a misalignment of 1mm in both directions. the total misalignment area of the graph covers a square of 2x2 mm (79x79 mil) with a step size of 100m. for each misalignment step, the measurement as shown in figure 19 is repeated and the accuracy (err max ? err min )/2 (e.g. 0.25o in figure 19 ) is entered as the z-axis in the 3d-graph.
www.austriamicrosystems.com/AS5245 revision 1.5 24 - 31 AS5245 data sheet - application information figure 17. example of linearity error over xy misalignment the maximum non-linearity error on this example is better than 1 degree (inner circle) over a misalignment radius of ~0.7mm. f or volume production, the placement tolerance of the ic within the package (0.235mm) must also be taken into account. the total nonlinea rity error over process tolerances, temperature and a misalignment circle radius of 0.25mm is specified better than 1.4 degrees. the magnet us ed for this measurement was a cylindrical ndfeb (bomatec? bmn-35h) magnet with 6mm diameter and 2.5mm in height. -1000 -700 -400 -100 200 500 800 -1000 -800 -600 -400 -200 0 200 400 600 800 1000 0 1 2 3 4 5 6 x y
www.austriamicrosystems.com/AS5245 revision 1.5 25 - 31 AS5245 data sheet - application information figure 18. example of linearity error over 360 o 9.6.2 transition noise transition noise is defined as the jitter in the transition between two steps. due to the nature of the measurement principle ( hall sensors + preamplifier + adc), there is always a certain degree of noise involved. this transition noise voltage results in an angular tr ansition noise at the outputs. it is specified as 0.06 degrees rms (1 sigma) 1 in fast mode (pin mode = high) and 0.03 degrees rms (1 sigma) in slow mode (pin mode = low or open). this is the repeatability of an indicated angle at a given mechanical position. the transition noise has differ ent implications on the type of output that is used: absolute output; ssi interface: the transition noise of the absolute output can be reduced by the user by implementing averaging of readings. an averaging of 4 readings will reduce the transition noise by 6db or 50%, e.g. from 0.03o rms to 0.015o rms (1 sigma ) in slow mode. pwm interface: if the pwm interface is used as an analog output by adding a low pass filter, the transition noise can be reduced by lower- ing the cutoff frequency of the filter. if the pwm interface is used as a digital interface with a counter at the receiving sid e, the transition noise may again be reduced by averaging of readings. incremental mode: in incremental mode, the transition noise influences the period, width and phase shift of the output signals a, b and index. however, the algorithm used to generate the incremental outputs guarantees no missing or additional pulses even at high speeds (up to 30.000 rpm and higher). 9.6.3 high speed operation sampling rate. the AS5245 samples the angular value at a rate of 2.61k (slow mode) or 10.42k (fast mode, selectable by pin mode) samples per second. consequently, the absolute outputs are updated each 384s (96s in fast mode). at a stationary position of the magnet, the sampling rate creates no additional error. absolute mode. at a sampling rate of 2.6khz/10.4khz, the number of samples (n) per turn for a magnet rotating at high speed can be calculated by, n slowmode = (eq 3) n fastmode = (eq 4) the upper speed limit in slow mode is ~6.000rpm and ~30.000rpm in fast mode. the only restriction at high speed is that there w ill be fewer samples per revolution as the speed increases (see table 6) . regardless of the rotational speed, the absolute angular value is always sampled at the highest resolution of 12 bit. 1. statistically, 1 sigma represents 68.27% of readings; 3 sigma represents 99.73% of readings. -0.5 -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 1 55 109 163 217 271 325 379 433 487 541 595 649 703 757 811 865 919 973 transition noise err max err min 60 rpm 384 () s ? ---------------------------------- - 60 rmp 96 s ? -------------------------- -
www.austriamicrosystems.com/AS5245 revision 1.5 26 - 31 AS5245 data sheet - application information incremental mode. incremental encoders are usually required to produce no missing pulses up to several thousand rpms. therefore, the AS5245 has a built-in interpolator, which ensures that there are no missing pulses at the incremental outputs for rotational sp eeds of up to 30.000 rpm, even at the highest resolution of 10 bits (512 pulses per revolution). 9.6.4 propagation delays the propagation delay is the delay between the time that the sample is taken until it is converted and available as angular dat a. this delay is 96s in fast mode and 384s in slow mode. using the ssi interface for absolute data transmission, an additional delay must be considered, caused by the asynchronous samp ling (0 ? 1/ fsample) and the time it takes the external control unit to read and process the angular data from the chip (maximum clock rate = 1mhz, number of bits per reading = 18). angular error caused by propagation delay. a rotating magnet will cause an angular error caused by the output propagation delay. this error increases linearly with speed: e sampling = rpm * 6 * prop.delay (eq 5) where: esampling = angular error [o] rpm = rotating speed [rpm] prop.delay = propagation delay [seconds] note: since the propagation delay is known, it can be automatically compensated by the control unit processing the data from the as52 45. 9.6.5 internal timing tolerance the AS5245 does not require an external ceramic resonator or quartz. all internal clock timings for the AS5245 are generated by an on-chip rc oscillator. this oscillator is factory trimmed to 5% accuracy at room temperature (10% over full temperature range). this tol erance influences the adc sampling rate and the pulse width of the pwm output: absolute output; ssi interface: a new angular value is updated every 96s (typ) in fast mode and every 384s (typ) in slow mode. pwm output: a new angular value is updated every 400s (typ). the pwm pulse timings t on and t off also have the same tolerance as the internal oscillator. if only the pwm pulse width t on is used to measure the angle, the resulting value also has this timing tolerance. however, this tolerance can be cancelled by measuring both t on and t off and calculating the angle from the duty cycle (see pulse width modulation (pwm) output on page 15) . incremental mode: in incremental mode, the transition noise influences the period, width and phase shift of the output signals a, b and index. however, the algorithm used to generate the incremental outputs guarantees no missing or additional pulses even at high speeds (up to 30.000 rpm and higher). position = (eq 6) 9.6.6 temperature magnetic temperature coefficient. one of the major benefits of the AS5245 compared to linear hall sensors is that it is much less sensitive to temperature. while linear hall sensors require a compensation of the magnet?s temperature coefficients, the AS5245 automatically compensates for the varying magnetic field strength over temperature. the magnet?s temperature drift does not need to be consid ered, as the AS5245 operates with magnetic field strengths from 45?75mt. example: a ndfeb magnet has a field strength of 75mt @ -40oc and a temperature coefficient of -0.12% per kelvin. the temperature change is from -40o to +125o = 165k.the magnetic field change is: 165 x -0.12% = -19.8%, which corresponds to 75mt at -40oc and 60mt at 125oc. the AS5245 can compensate for this temperature related field strength change automatically, no user adjustment is required. 9.6.7 accuracy over temperature the influence of temperature in the absolute accuracy is very low. while the accuracy is less than or equal to 0.5o at room te mperature, it may increase to less then or equal to 0.9o due to increasing noise at high temperatures. t on 4097 ? t on t off + () ------------------------- 1 ?
www.austriamicrosystems.com/AS5245 revision 1.5 27 - 31 AS5245 data sheet - application information timing tolerance over temperature. the internal rc oscillator is factory trimmed to 5%. over temperature, this tolerance may increase to 10%. generally, the timing tolerance has no influence in the ac curacy or resolution of the syst em, as it is used mainly for internal clock generation. the only concern to the user is the width of the pwm output pulse, which relates directly to the timing tolerance o f the internal oscillator. this influence, however, can be cancelled by measuring the complete pwm duty cycle instead of just the pwm pulse. 9.7 AS5245 differences to as5045 all parameters are according to as5045 data sheet except for the parameters shown below: table 14. difference between AS5245 and as5045 building block AS5245 as5045 resolution 12bits, 0.088o/step. 12bits, 0.088o/step. ambient temperature range -40oc to +150oc -40oc to +125oc data length read: 18bits (12bits data + 6 bits status) otp write: 18 bits (12bits zero position + 6 bits mode selection) read: 18bits (12bits data + 6 bits status) otp write: 18 bits (12bits zero position + 6 bits mode selection) pins 1 and 2 magincn, magdecn: same feature as as5045, additional otp option for red-yellow-green magnetic range magincn, magdecn incremental encoder pin3 (dtest1_a); pin 4 (dtest2_b); pin 6 (mode_index) 2x1024 ppr (12-bit) 2x256 ppr low-jitter (10-bit) not used pin 3: not used pin 4:not used pin 6 mode_index pin selects fast or slow mode in the default configuration. in case of incremental mode, the fast mode is selected and the pin is configured as output. mode_index pin selects fast or slow mode in the default configuration. pin 12 pwm output: frequency selectable by otp: 1s / step, 4096 steps per revolution, f=244hz 2s/ step, 4096 steps per revolution, f=122hz pwm output: frequency selectable by otp: 1s / step, 4096 steps per revolution, f=244hz 2s/ step, 4096 steps per revolution, f=122hz sampling frequency selectable by mode input pin: 2.5khz, 10,4khz selectable by mode input pin: 2.5khz, 10,4khz propagation delay 384s (slow mode) 384s (slow mode) 96s (fast mode) 96s (fast mode) transition noise (rms; 1sigma) 0.03 degrees maximum (slow mode) 0.03 degrees maximum (slow mode) 0.06 degrees maximum (fast mode) 0.06 degrees maximum (fast mode) otp programming options pptrim; programming voltage 3.3v ? 3.6v <70oc; 3.5v ? 3.6v >70oc; 52-bit serial data protocol; csn, pdio and clk easyzap; programming voltage 7.3v ? 7.5v; csn; prog and clk; 16-bit (32-bit) serial data protocol;
www.austriamicrosystems.com/AS5245 revision 1.5 28 - 31 AS5245 data sheet - pack age drawings and markings 10 package drawin gs and markings the device is available in a qfn 32 (7mm x 7mm) package. figure 19. package drawings table 15. package dimensions symbol mm inch min typ max min typ max d 7 bsc 0.28 bsc e 7 bsc 0.28 bsc d1 4.18 4.28 4.38 0.165 0.169 0.172 e1 4.18 4.28 4.38 0.165 0.169 0.172 l 0.45 0.55 0.65 0.018 0.022 0.026 b 0.25 0.30 0.35 0.010 0.012 0.014 e 0.65 bsc a 0.80 0.90 1.00 0.031 0.035 0.039 a1 0.203 ref 0.008 ref 25 32 8 1 16 9 17 24 AS5245 top view side view b otto m vi e w
www.austriamicrosystems.com/AS5245 revision 1.5 29 - 31 AS5245 data sheet - revision history revision history note: typos may not be explicitly mentioned under revision history. revision date owner description 1.0 june 08, 2007 apg initial revision july 24, 2008 changes made to values in table 9 - incremental resolution feb 13, 2009 updated min, typ, max values for t dovalid parameter in table 5 - timing characteristics july 15, 2009 rfu 1) note added under table 6 - slow and fast mode parameters 2) output md0, md1 description updated, (see user selectable settings on page 18) july 22, 2009 mub updated values in table 5 - timing characteristics for the following parameters: -t dovalid -f pwm -pw min -pw max july 23, 2009 updated sections electrical characteristics on page 6 , timing characteristics on page 9 and detailed description on page 10 according to as5145 datasheet. 1.1 oct 19, 2009 apg deleted the following -- 1) ?otp programming connection? figure 2) physical placement of the magnet, magnet placement, simulation modeling 1.2 nov 05, 2009 timing characteristics (page 9) - deleted the parameter ?pwm frequency? (f pwm ) 1.3 dec 04, 2009 updated section internal timing tolerance (page 26) 1.4 apr 01, 2010 updated standards in absolute maximum ratings on page 5 apr 13, 2010 updated package drawings and markings on page 28 1.5 jun 17, 2010 mub updated mode_index , pwm , electrical characteristics (page 6) , fpwm (page 9) , figure 9 , table 11 . info on ?magnet input specification? deleted from the document.
www.austriamicrosystems.com/AS5245 revision 1.5 30 - 31 AS5245 data sheet - ordering information 11 ordering information the devices are available as the standard products shown in table 16 . note: all products are rohs compliant and pb-free. buy our products or get free samples online at icdirect: http://www.austriamicr osystems.com/icdirect for further information and requests, please contact us mailto:sales@austriamicrosystems.com or find your local distributor at http://www.austriamicros ystems.com/distributor table 16. ordering information ordering code description delivery form package AS5245hqft 12-bit fully redundant magnetic rotary encoder tape & reel qfn 32 (7mm x 7mm)
www.austriamicrosystems.com/AS5245 revision 1.5 31 - 31 AS5245 data sheet - copyrights copyrights copyright ? 1997-2010, austriamicrosystems ag, tobelbaderstrasse 30, 8141 unterpremstaetten, austria-europe. trademarks registe red ?. all rights reserved. the material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. all products and companies mentioned are trademarks or registered trademarks of their respective companies. disclaimer devices sold by austriamicrosystems ag are covered by the warranty and patent indemnification provisions appearing in its term of sale. austriamicrosystems ag makes no warranty, express, statutory, implied, or by description regarding the information set forth he rein or regarding the freedom of the described devices from patent infringement. austriamicrosystems ag reserves the right to change specificatio ns and prices at any time and without notice. therefore, prior to designing this product into a system, it is necessary to check with austriamic rosystems ag for current information. this product is intended for use in normal commercial applications. applications requiring extended temper ature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by austriamicrosystems ag for each application. for shipments of les s than 100 parts the manufacturing flow might show deviations from the st andard production flow, such as test flow or test location. the information furnished here by austriamicrosystems ag is believed to be correct and accurate. however, austriamicrosystems ag shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. no obligation or liability to recipient or any third party shall arise or flow out of austriamicrosystems ag rendering of technical or other services. contact information headquarters austriamicrosystems ag tobelbaderstrasse 30 a-8141 unterpremstaetten, austria tel: +43 (0) 3136 500 0 fax: +43 (0) 3136 525 01 for sales offices, distributors and representatives, please visit: http://www.austriamicrosystems.com/contact

▲Up To Search▲

Price & Availability of AS5245

	To Download AS5245 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .