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general description the MAX31913 industrial interface serializer translates, conditions, and serializes the 24v digital output of sen - sors and switches used in industrial, process, and build - ing automation to 5v cmos-compatible signals required by microcontrollers. it provides the front-end interface cir - cuit of a programmable logic controller (plc) digital input module. the device features integrated current limiting, lowpass filtering, and channel serialization. input current limiting allows a significant reduction in power consumed from the field voltage supply as compared to traditional discrete resistor-divider implementations. selectable on- chip lowpass filters allow flexible debouncing and filter - ing of sensor outputs based on the application. on-chip serialization allows a drastic reduction in the number of optocouplers used for isolation. the device serializer is stackable so that any number of input channels can be serialized and output through only one spi-compatible port. this reduces the number of optocouplers needed to only three, regardless of the number of input channels. for enhanced robustness with respect to high-frequency noise and fast electrical transients, a multibit crc code is generated and transmitted through the spi port for each 8 bits of data. the on-chip 5v voltage regulator can be used to power external optocouplers, digital isola - tors, or other external 5v circuitry. field-side led drivers recycle the current from the eight inputs to provide visual input status indication without any additional current or power consumption. for ultra-low-power applications, and for the lowest possible heat dissipation. maxim integrated plans to offer a pin-compatible version of this device, the max31912. the max31912 uses patent-pending circuit techniques to achieve further reduction of power beyond what is possible by input current limiting alone. contact the factory for availability. features s eight high-voltage input channels (36v max) s configurable for iec 61131-2 input types 1, 2, 3 s wide operating supply range of 7v to 36v s optional configuration allows 5v supply s selectable input filtering and debouncing from 0ms to 3ms s configurable input current limiting from 0.5ma to 6ma s high hbm esd immunity on all field input pins s on-chip 8-to-1 serialization with spi interface s on-chip 5v regulator s overtemperature indicator s on-chip 24v field supply voltage monitor s very low quiescent current and power/heat dissipation s multibit crc code generation and transmission for error detection and more reliable data transmission to an external micro s field-side energyless led drivers applications digital input modules for plcs industrial, building, and process automation motor control block diagram 19-6641; rev 0; 3/13 ordering information appears at end of data sheet. for related parts and recommended products to use with this part, refer to www.maximintegrated.com/MAX31913.related . sout cs modesel sin db1 db0 faultb 5vout v cc24v riref gnd rt0 in0 rt7 in7 vref input channel 0 vref sensors 24v crc gen. controller or isolation 5v 5v regulator input channel 7 supply monitor temp monitor current limiter lp filter clk voltage comparator serializer MAX31913 MAX31913 industrial, octal, digital input translator/serializer evaluation kit available for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim integrateds website at www.maximintegrated.com.
MAX31913 industrial, octal, digital input translator/serializer 2 (voltages relative to gnd.) voltage range on v cc24v ............................. -0.3v to +45v voltage range on in1Cin8 ............................ -0.3v to +45v voltage range on in1Cin8 (through 2.2k resistors) ............................. -45v to +45v voltage range on db0/db1, clk, sin, cs , modesel .......................... -0.3v to (v 5vout + 0.3v) continuous power dissipation (t a = +70 n c) tssop (derate 27mw/ n c above +70 n c) .......... 2162.2mw operating temperature range ambient temperature .............................. -40 n c to +125 n c junction temperature .............................. -40 n c to +150 n c storage temperature range ...................... -55 n c to +125 n c lead temperature (soldering, 10s) ......................... +300 n c soldering temperature (reflow) ............................... +260 n c tssop junction-to-ambient thermal resistance ( q ja ) .......... 37c/w junction-to-case thermal resistance ( q jc ) ................. 2c/w absolute maximum ratings note 1: package thermal resistances were obtained using the method described in jedec specification jesd51-7, using a four-layer board. for detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial . stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only, and functional opera - tion of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. package thermal characteristics (note 1) recommended operating conditions (note 2) parameter symbol conditions min typ max units field supply voltage v cc24v (note 3) 7 36 v field inputs voltage v inn (note 4) -0.3 36 v logic inputs voltage v logic 0 5.5 v current-limit setting resistor r ref 15 k i field input data rate f in (note 5) 200 khz maxim integrated
MAX31913 industrial, octal, digital input translator/serializer 3 dc electrical characteristics (v cc24v = 7v to 36v, t j = -40 n c to +150 n c, unless otherwise noted.) (note 2) parameter symbol conditions min typ max units field-supply current i cc24v in1Cin8 = 24v, 5vout = open, rt1Crt8 = gnd, all logic inputs open 1.6 2.3 ma field-supply uv1 alarm off/on v onuv1 9 10 v field-supply uv1 alarm on/off v offuv1 7 8 v field-supply uv2 alarm off/on v onuv2 16.5 18 v field-supply uv2 alarm on/off v offuv2 14 15.5 v led on-state current i rt-on r ref = 15k i , v cc24v = 18v to 30v 2.2 ma field input threshold high-to- low v in-(inf) 2.2k i external series resistor 7 8.4 v field input threshold low-to- high v in+(inf) 2.2k i external series resistor 9.4 10.2 v field input hysteresis v hys(inf) 2.2k i external series resistor 1 v input threshold high-to-low (at ic pin) v th-(inp) 3 3.4 v input threshold low-to-high (at ic pin) v th+(inp) 4.4 5 v input threshold hysteresis (at ic pin) v hys(inp) 1 v field input pin resistance r inp 0.8 k i field input current limit i inlim r ref = 15k i , v cc24v = 18v to 30v, t a = +25c to +125c (note 6) 2.2 2.4 2.7 ma filter time constant t filter db1/db0 = 0/0: no filtering 0 ms db1/db0 = 0/1 0.008 0.025 0.038 db1/db0 = 1/0 0.25 0.75 1.1 db1/db0 = 1/1 1.0 3 4.5 linear regulator output v 5vout max i load = 50ma 4.75 5.0 5.25 v regulator line regulation dvreg line i load = 50ma 10 20 mv regulator load regulation dvreg load i load = 1ma to 50ma 20 50 mv logic-low output voltage v ol i ol = 4ma 0.4 1.0 v logic-high output voltage v oh i oh = -4ma 4.0 v logic-input trip point v ih-il 0.3 x v 5vout 0.5 x v 5vout 0.7 x v 5vout v logic-input leakage current i il -50 -30 -15 f a overtemperature alarm t alrm 135 n c maxim integrated
MAX31913 industrial, octal, digital input translator/serializer 4 note 2: limits are 100% production tested at t a = +25c and/or t a = +125c. limits over the operating temperature range and relevant supply voltage range are guaranteed by design and characterization. typical values are not guaranteed. note 3: if a 24v supply is not available, the device can be powered through v 5vout . in this mode of operation, the v cc24v sup - ply must be left unconnected. all other specifications remain identical. the field-supply uv1 and uv2 alarms will be acti - vated (set to 1), indicating the absence of the 24v supply in this mode of operation. note 4: when using suggested external 2.2k series resistors, limits of -3v to +36v apply. note 5: f in refers to the maximum pulse frequency (1/f in = shortest pulse width) that can be detected from the field sensors and switches. note 6: external resistor r ref can be adjusted to set any desired current limit between 0.5ma and 6ma. note 7: see figure 8 . note 8: see figure 5 . note 9: see figure 7 . note 10: see figure 6 . note 11: this is the maximum bit transfer rate through the serializer interface. ac electrical characteristics: spi interface (v cc24v = 7v to 36v, t j = -40 n c to +150 n c, unless otherwise noted.) (note 2) ac electrical characteristics (v cc24v = 7v to 36v, t j = -40 n c to +150 n c, unless otherwise noted.) (note 2) parameter symbol conditions min typ max units clk pulse duration t clkpw (note 7) 20 ns cs pulse duration t cspw (note 8) 20 ns sin to clk setup time t su1 (note 9) 5 ns sin to clk hold time t h1 (note 9) 8 ns cs to clk setup time t su2 (note 10) 8 ns cs to clk recovery time t rec (note 10) 12 ns clock pulse frequency f clk (notes 7, 11) 25 mhz propagation delay, clk to sout t p1 (note 7) 20 ns propagation delay, cs to sout t p2 (note 8) 20 ns rise/fall time sout/ fault t r/f (note 7) 40 ns parameter symbol conditions min typ max units field input pulse width t pw no external capacitors on pins in1 - in8 1 s esd hbm, all pins 2 kv hbm, in1 - in8 with respect to gnd 15 maxim integrated
5 typical operating characteristics (t a = +25c, r ref = 15k, unless otherwise noted.) supply current vs. v cc24v field supply MAX31913 toc01 supply voltage (v) supply current (ma) 1.65 1.60 1.70 1.75 1.80 1.85 1.90 1.55 51 52 53 5 supply current vs. temperature MAX31913 toc02 temperature (c) supply current (ma) 60 110 10 1.7 1.6 1.8 1.9 2.2 2.1 2.0 2.3 1.5 -40 current limit vs. r ref MAX31913 toc03 r ref (k i ) current limit (ma) 40 50 30 20 10 5.5 0.5 1.5 2.5 3.5 4.5 0 current limit vs. temperature MAX31913 toc04 temperature (c) current limit (ma) 110 60 10 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3.0 2.0 -40 current limit vs. field-input voltage MAX31913 toc05 field-input voltage (v) current limit (ma) 35 25 15 0.5 1.0 1.5 2.0 2.5 3.0 0 5 input-voltage hysteresis vs. temperature MAX31913 toc06 temperature (c) input-voltage hysteresis (v) 110 60 10 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4 4.6 4.8 5.0 2.6 -40 on-off threshold off-on threshold r in = 0i input-voltage hysteresis vs. temperature MAX31913 toc07 temperature (c) input-voltage hysteresis 110 60 10 7.8 8.2 8.0 8.4 8.6 9.0 8.8 9.2 9.4 9.6 9.8 10.0 7.6 -40 r in = 2.2i off-on threshold on-off threshold ldo load regulation MAX31913 toc08 5vout otput current (ma) 5vout voltage (v) 4.92 4.94 4.96 4.98 5.00 5.02 5.04 5.06 5.08 5.10 4.90 0 40 50 30 20 10 ldo line regulation MAX31913 toc09 supply voltage (v) 5vout voltage (v) 4.92 4.94 4.96 4.98 5.00 5.02 5.04 5.06 5.08 5.10 4.90 6 36 31 26 21 16 11 i 5vout = 5ma MAX31913 industrial, octal, digital input translator/serializer maxim integrated
6 typical operating characteristics (continued) (t a = +25c, r ref = 15k, unless otherwise noted.) ldo line regulation MAX31913 toc10 supply voltage (v) 5vout voltage (v) 4.92 4.94 4.96 4.98 5.00 5.02 5.04 5.06 5.08 5.10 4.90 6 36 31 26 21 16 11 i 5vout = 50ma ldo output voltage vs. temperature MAX31913 toc12 ambient temperature (c) 5vout voltage (v) 4.92 4.94 4.96 4.98 5.00 5.02 5.04 5.06 5.08 5.10 4.90 -40 110 60 10 i 5vout = 0ma ldo output vs. v cc24v field supply MAX31913 toc11 supply voltage (v) 5vout otput voltage (v) 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 5.5 4.5 4 34 24 14 i 5vout = 50ma ldo output voltage vs. temperature MAX31913 toc13 ambient temperature (c) 5vout voltage (v) 4.92 4.94 4.96 4.98 5.00 5.02 5.04 5.06 5.08 5.10 4.90 -40 110 60 10 i 5vout = 5ma MAX31913 industrial, octal, digital input translator/serializer maxim integrated
MAX31913 industrial, octal, digital input translator/serializer 7 pin description pin configuration pin name function 1, 2 db0, db1 debounce (filtering) time select inputs 3, 5, 7, 9, 11, 18, 20, 22 in1Cin8 field inputs 4, 6, 8, 10, 12, 17, 19, 21 rt1Crt8 energyless led driver outputs. connect to gnd if leds are not required. 13 riref current-limiter reference resistor 14 v cc24v field-supply voltage 15 5vout 5v regulator output 16 fault active-low undervoltage alarm 23 sout serial-data out 24 cs active-low chip-select input 25 clk serial-clock input 26 modesel mode-select input modesel = 1: selects 8-bit shift register modesel = 0: selects 16-bit shift register 27 sin serial-data input 28 gnd field ground ep exposed pad. must be connected to the pcb ground plane. top view MAX31913 25 4c lk rt1 26 3 modesel in1 27 2 sin db1 28 1 + gnd db0 22 7 in8 in3 23 6 sout rt2 21 8 rt8 rt3 20 9 in7 in4 19 10 rt7 rt4 18 11 in6 in5 17 12 rt6 rt5 16 13 fault riref 24 5 cs in2 15 14 5vout v cc24v ep maxim integrated
MAX31913 industrial, octal, digital input translator/serializer 8 typical application circuit detailed description input current clamp the MAX31913 industrial interface serializer inputs (in1Cin8) sense the state (on vs. off) of field sen - sors by monitoring both voltage and current flowing through the sensor output. the current sinking through these input pins rises linearly with input voltage until the limit set by the current clamp is reached. any volt - age increase beyond this point does not increase the input current any further. the value of the current clamp is adjustable through an external resistor connected between the riref pin and gnd. pins rt0Crt7 must be connected directly to gnd to provide a return path for the input current. the voltage and current at the in1Cin8 input pins are compared against internally set references to deter - mine whether the sensor is on (logic 1) or off (logic 0). the trip points determining the on/off status of the sensor satisfy the requirements of iec 61131-2 type 1 and 3 switches. the device can also be configured to work as a type 2 switch. glitch filter a digital glitch filter provides debouncing and filtering of noisy sensor signals. the time constant of this filter is programmable from 0ms to 3ms through the db0 and db1 pins. see table 1 for debounce settings. to provide the digital glitch filter, the device checks that an input is stable for at least three clock cycles. the duration of a clock cycle is 1/3 of the selected debounce time. if the input is not stable for at least three clock cycles, the input change is not sent to the internal shift register. gnd modesel db1 db0 5vout led 1?8 sin clk cs sout fault clk cs sout fault isolation jumpers to 5vout and gnd c3 vdd_logic r ref r inx r1 24v f in1?8 riref c1 in1?8 rt1?8 v cc24v MAX31913 maxim integrated
MAX31913 industrial, octal, digital input translator/serializer 9 table 1. debounce settings reading serial data the filtered outputs of the input comparators are latched into a shift register at the falling edge of cs . clocking the clk pin, while cs is held low, shifts the latched data out of sout 1 bit at a time. the internal data serializer comprises a 16-bit shift register, containing 8 bits of data corresponding to the eight field inputs, as well as an 8-bit status byte containing supplementary status and crc informa - tion. the status byte contains 1 bit representing the status of the field-supply voltage (uv), 1 bit represent - ing the status of the internal temperature monitor (ot), a 5-bit crc code internally calculated and generated, and a trailing 1 as a stop bit. the undervoltage (uv) bit is normally 0. if the supply voltage falls below v offuvlo , the uv becomes a 1. the uv bit returns to 0 once the supply voltage has returned above v onuvlo . the overtemperature (ot) bit is also normally 0. if the junction temperature increases to above t alrm , the ot bit becomes a 1. the bit returns to 0 once the junction temperature has returned below t alrm . the crc code can be used to check data integrity during transfer from the device to an external microcontroller. in applications where the integrity of data transferred is not of concern, the crc bits can be ignored. the crc uses the following polynomial: p(x) = x 5 + x 4 + x 2 + x 0 the number of bits in the internal serializer can be selected between 8 bits or 16 bits. the modesel pin is used to configure the serializer as an 8-bit (disabling the status byte) or 16-bit shift register. in 8-bit mode, only the eight field input states are transferred through the spi port and the status byte is ignored. therefore, in multiple ic applications (input channels greater than 8), if desired, only a single status byte can be generated and transmitted for any number of input channels. the shift register contents are read only (no write capability exists) through the spi-compatible interface. for higher input counts than 8, multiple devices can be cascaded. in this case, the sout pin of one device should be connected to the sin pin of the next device, effectively cascading the internal shift regis - ters. the clk and cs pins of all the devices should be connected together in this configuration. see the serial-port operation section for more detailed information on operating the spi interface. temperature monitoring the internal junction temperature of the device is constantly monitored. an alarm is raised, by asserting the ot bit to a 1. supply voltage monitoring a primary supply voltage monitor circuit constantly monitors the field-supply voltage. if this voltage falls below a threshold (v offuv1 ), an alarm is raised by asserting the fault pin, indicating that the part is expe - riencing a fault condition and the data in the serializer is not to be trusted. in addition, the device resets the uv1 bit to a 0. once the field-supply voltage has recovered and goes above v onuv1 , the fault pin is released. a secondary supply voltage monitor circuit also monitors the field-supply voltage. this secondary monitor only raises a flag in the serializer, by resetting the uv2 bit to 0 (it does not assert the fault pin), if the field supply drops below v offuv2 . once the supply voltage goes back above v onuv2 , the uv2 bit is set to 1. the second - ary supply monitor has higher trip points and its purpose is to warn the system that the supply voltage is below specifications (approximately 24v - 20%). whereas the purpose of the primary supply monitor is to warn that the supply voltage has dropped to a value close to the minimum operating voltage of the ic. db1 db0 binary value debounce time 0 0 0 0 0 1 1 25 f s 1 0 2 0.75ms 1 1 3 3ms maxim integrated
MAX31913 industrial, octal, digital input translator/serializer 10 table 2. recommended components applications information emc standards compliance the external components shown in figure 1 allow the device to operate in harsh industrial environments. components were chosen to assist in suppression of voltage burst and surge transients, allowing the system to meet or exceed international emc require - ments. table 2 lists an example device for each com - ponent in figure 1 . the system shown in figure 1 , using the components shown in table 2 , is designed to be robust against iec burst transient, surge tran - sient, and rfi specifications (iec 61000-4, -5, -6, and -2). figure 1. typical emc protection circuitry component description required/recommended/optional c0 4.7nf, 2kv polypropylene capacitor recommended c1 10 f f, 60v ceramic capacitor required c3 100nf, 10v ceramic capacitor recommended c4 4.7f, 10v low esr ceramic capacitor required d0 36v fast zener diode (zsmb36) recommended d1 general-purpose rectifier (in4007) optional: for reverse polarity protection led1 Cled8 leds for visual input status indication optional r1 150 i , 1/3w melf resistor required r inx 2.2k i , 1/4w melf resistor required r ref 15k i , 1/8w resistor required gnd modesel db1 db0 5vout sin clk cs sout fault clk cs sout fault isolation jumpers to 5vout and gnd c4 c3 vdd_logic r ref 0v r inx f in1?8 riref in1?8 rt1?8 *if leds are not used, user must ground the rt pins. d1 v cc24v MAX31913 r1 24v d0 c1 c0 c0 led 1?8* maxim integrated
MAX31913 industrial, octal, digital input translator/serializer 11 serial-port operation serial output of the device functions in one of two modes, depending on the modesel setting ( table 3 ). with modesel = 0, the device output includes a 5-bit crc, an undervoltage alarm, and an overtemperature alarm. see the detailed description for crc, undervolt - age, and overtemperature functional descriptions. with modesel = 1, the device outputs only the state of the in1Cin8 inputs and omits the crc, undervoltage alarm, and overtemperature alarm. daisy-chain operation for systems with more than eight sensor inputs, multiple devices can be daisy-chained to allow access to all data inputs through a single serial port. when using a daisy- chain configuration, connect sout of one of the devices to the sin input of another upstream device. cs and sck of all devices in the chain should be connected together in parallel (see figure 2 ). in a daisy-chain configuration, external components used to enhance emc robustness do not need to be duplicated for each device of a circuit board. figure 3 illustrates a 16-input application. spi waveforms the serial output of the device adheres to the spi proto - col, running with cpha = 0 and cpol = 0. input states on in1Cin8 are latched in on the falling edge of cs . the transfer of data out of the slave output, sout, starts immediately when cs is asserted (i.e., msb is output onto sout independent of clk). the remaining data bits are shifted out on the falling edge of clk. the data bits are written to the output sout with msb first. when cs is high, sout is high impedance. the resultant timing is shown in figure 4 . note that all bits after in1 are invalid if 8-bit operation mode is selected with the modesel input. figure 5 , figure 6 , figure 7 , and figure 8 illustrate spi timing specifications. figure 2. daisy-chain operation table 3. modesel settings modesel setting functionality 0 16-bit output; [in8Cin1][crc (5 bit)][uv1][ot][uv2] 1 8-bit output; [in8Cin1] MAX31913 MAX31913m ax3191 3 sin sout sin sout sin sout to controller maxim integrated
MAX31913 industrial, octal, digital input translator/serializer 12 figure 3. 16-input application circuit modesel db1 db0 5vout clk cs sout fault clk cs sout fault isolation sin jumpers to 5vout and gnd jumpers to 5vout and gnd c4 c3 c4 c3 vdd_logic r ref 0v d1 r inx f in1?8 riref gnd in1?8 rt1?8 v cc24v MAX31913 r1 24v d0 c1 c0 c0 gnd fault sout cs clk sin modesel db1 db0 5vout r ref r inx f in1?8 riref c1 in1?8 rt1?8 v cc24v MAX31913 maxim integrated
MAX31913 industrial, octal, digital input translator/serializer 13 figure 5. spi timing diagram 1 figure 6. spi timing diagram 2 figure 7. spi timing diagram 3 figure 8. spi timing diagram 4 figure 4. spi communication example sout t cspw t p2 cs clk sin t su1 t h1 sin valid clk t su2 t rec cs t c lkp w 1/ f clk t r/f t r/f t p1 sout clk clk sout in8 ? in0 in8 in7 in6 in5 in4 in3 in2 in1 crc4 crc3 crc2 crc1 crc0 uv ot res valid cs maxim integrated
MAX31913 industrial, octal, digital input translator/serializer 14 ordering information + denotes a lead(pb)-free/rohs-compliant package. t = tape and reel. chip information process: s45jrs package information for the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages . note that a +, #, or - in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status. part temp range pin- package carrier MAX31913aui+ -40 n c to +125 n c 28 tssop bulk MAX31913aui+t -40 n c to +125 n c 28 tssop tape and reel package type package code outline no. land pattern no. 28 tssop-ep u28e+4 21-0108 90-0146 maxim integrated
maxim integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim integrated product. no circuit patent licenses are implied. maxim integrated reserves the right to change the circuitry and specifications without notice at any time. the parametric values (min and max limits) shown in the electrical characteristics table are guaranteed. other parametric values quoted in this data sheet are provided for guidance. maxim integrated 160 rio robles, san jose, ca 95134 usa 1-408-601-1000 15 ? 2013 maxim integrated products, inc. maxim integrated and the maxim integrated logo are trademarks of maxim integrated products, inc. revision history revision number revision date description pages changed 0 3/13 initial release MAX31913 industrial, octal, digital input translator/serializer

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