general description the MAX9611PMB1 peripheral module provides the necessary hardware to interface the max9611 current- sense amplifier with 12-bit adc and op amp, along with the max5380 8-bit dac, to any system that utilizes pmod k -compatible expansion ports configurable for i 2 c communication. the ic is configured with an exter - nal p-channel fet and a current-sense resistor to form a current-limiting circuit capable of handling currents up to 1a. an 8-bit dac (u1) is used to set the current- limit point programmatically by the host through the i 2 c bus. in addition to providing a programmable current- limit function, the adc within the ic measures the load current/voltage and the set-point voltage that can be read by the host through the i 2 c bus. refer to the max9611 ic data sheet for detailed informa - tion regarding operation of the ic. features s programmable current limit up to 1a s two current ranges (jumper selectable) s measure and read back load current, load voltage, and set point s power source up to 30v s jumper-selectable i 2 c address setting for the max9611 s 6-pin pmod-compatible connector (i 2 c) s secondary header allows daisy-chaining of additional modules on the i 2 c bus s example software written in c for portability s rohs compliant s proven pcb layout s fully assembled and tested _________________________________________________________________ maxim integrated products 1 MAX9611PMB1 peripheral module 19-6328; rev 0; 5/12 ordering information appears at end of data sheet. pmod is a trademark of digilent inc. MAX9611PMB1 peripheral module for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxims website at www.maxim-ic.com.
designation qty description c1, c2, c3 3 0.1 f f q 10%, 16v x7r ceramic capacitors (0603) murata grm188r71c104ka01d c4 1 4.7 f f q 10%, 10v x5r ceramic capacitor (0603) tdk c2012x5r1a475k/0.85 c5 1 10 f f q 10%, 10v x5r ceramic capacitor (0603) tdk c2012x5r1a106k/1.25 c6 1 1 f f q 10%, 10v x7r ceramic capacitor (0603) tdk c1608x7r1a105k c7 1 0.01 f f q 10%, 16v x7r ceramic capacitor (0603) murata grm188r71c103ka01d f1 1 4.7 f f emi filter (3-terminal capacitor) murata nfm21pc475b1a3d j1 1 6-pin right-angle male header j2 1 8-pin (2 x 4) straight male header j3, jp1, jp2, jp3 4 3-pin straight male headers designation qty description q1 1 2.2a, 30v p-channel mosfet (3 sot23) vishay si2303cds r1Cr5 5 4.7k i q 1% resistors (0603) r6, r7 2 150 i q 5% resistors (0603) r8 1 7.5k i q 1% resistor (1206) r9 1 845 i q 1% resistor (1206) r10 1 4.02k i q 1% resistor (0603) r11 1 402 i q 1% resistor (0603) r12 1 8.06k i q 1% resistor (0603) r13 1 0.2 i q 1%, 2w current-sense resistor (2512) stackpole csrn2512fkr200 r14, r15 2 10k i q 5% resistors (0603) u1 1 low-cost, 8-bit dac (5 sot23) maxim max5380meuk+ u2 1 current-sense amplifier with 12-bit adc (10 f max m ) maxim max9611aub+ 3 shorting jumpers 1 pcb: epcb9611pm1 supplier phone website murata electronics north america, inc. 770-436-1300 www.murata-northamerica.com tdk corp. 847-803-6100 www.component.tdk.com vishay 402-563-6866 www.vishay.com pin signal description 1 n.c. not connected 2 n.c. not connected 3 scl i 2 c serial clock 4 sda i 2 c serial data 5 gnd ground 6 vcc power supply _________________________________________________________________ maxim integrated products 2 component list component suppliers note: indicate that you are using the MAX9611PMB1 when contacting these component suppliers. max is a registered trademark of maxim integrated products, inc. detailed description i 2 c interface the MAX9611PMB1 peripheral module can interface to the host in one of two ways. it can plug directly into a pmod-compatible port (configured for i 2 c) through con - nector j1, or in this case, other i 2 c boards can attach to the same i 2 c bus through connector j2. i 2 c interface (daisy-chaining modules) alternatively, the peripheral module can connect to other i 2 c-based pmod modules using a 4-conductor ribbon cable connecting to the j2 connector. in this situation, pins 1-4 and 5-8 on j2 provide two connections to the i 2 c bus, allowing the module to be inserted into an i 2 c bus daisy-chain. connector j1 provides connection of the module to the pmod host. the pin assignments and functions adhere to the pmod standard recommended by digilent. see table 1. table 1. connector j1 (i 2 c communication) MAX9611PMB1 peripheral module
pin signal description 1 scl i 2 c serial clock 2 sda i 2 c serial data 3 gnd ground 4 vcc power supply 5 scl i 2 c serial clock 6 sda i 2 c serial data 7 gnd ground 8 vcc power supply jp2 (a0) jp3 (a1) device address (hex) write read 1-2 1-2 0xe0 0xe1 1-2 2-3 0xe4 0xe5 1-2 open 0xe6 0xe7 2-3 1-2 0xf0 0xf1 2-3 2-3 0xf4 0xf5 2-3 open 0xf6 0xf7 open 1-2 0xf8 0xf9 open 2-3 0xfc 0xfd open open 0xfe 0xff pin signal description 1 power source this pin should be attached to the positive terminal of the external power supply. the external power source should be greater than 0v and less than 30v. 2 load this pin should be attached to a ground- referenced load. 3 ground external ground. this ground connection is referenced to the module ground on pin 5 of connector j1. 1a max 30v dc max MAX9611PMB1 v+ ld gnd load control j3 sense _________________________________________________________________ maxim integrated products 3 connector j2 allows the module to be connected through a daisy-chain from another i 2 c module and/or provide i 2 c and power connections to other i 2 c modules on the same bus. see table 2. i 2 c addressing options both the max5380m and max9611 reside on the i 2 c bus. the max5380m has a fixed i 2 c slave address of 0x62 (other versions of the max5380 are available with different i 2 c slave addresses). the i 2 c slave address for the max9611 can be one of nine different values depending on the settings on jumpers jp2 and jp3. table 3 lists the settings of those jumpers and the cor - responding values of the slave read and write address. refer to the max9611/max9612 ic data sheet for more information. connecting an external power supply and load the peripheral module provides high-side current limiting for an external power supply and load. the supply and load should be connected to the peripheral module, as shown in figure 1. although the ic is capable of opera - tion up to 60v, the external supply should not exceed 30v due to voltage limitations of the si2303 pfet. while the pass components are rated to 2.7a, operation above 1a may not yield reliable results due to thermal limitations. reliable operation of this circuit above 1a should be possible in the users application if additional surface/heatsink area for both the si2303 pfet and the 0.2 i sense resistor is provided. the j3 connector provides for the attachment of an exter - nal power supply and load. see table 4. table 2. connector j2 (i 2 c expansion) table 4. connector j3 (external power and load) table 3. i 2 c slave addresses (max9611) figure 1. connection of an external power supply and load MAX9611PMB1 peripheral module
shunt position v set full-scale current limit (a) current- limit step size (ma) 1-2 v dac 2.56 10 2-3 v dac /10 0.256 1 _________________________________________________________________ maxim integrated products 4 current limit the point at which current limiting begins is determined by the voltage at pin 4 on the max9611 (v set ). this volt - age is set by the output of the dac (max5380) and the setting of the shunt on jp1, which selects either v dac or v dac /10. the nominal 2.00v output of the dac is divided to 1.26v full scale by the divider formed by r3 and r8 + r9. the lower tap of that divider (r3 + r8 and r9) provides 0.126v full scale. the position of the shunt on jp1 determines which of the two voltages is connected to v set on the max9611. with the shunt connected between jp1-1 and jp1-2, the higher voltage (v dac ) is connected to v set . this setting allows full-scale current limit at 2.56a with 10ma steps ( caution: although soft - ware settings do not prohibit it, the circuit should not be operated above 1a output current as overheating and unreliable operation could result). when the shunt is con - nected between jp1-2 and jp1-3, the full-scale current is 256ma with 1ma steps. important: the total power dissipation for the pass fet (q1) should not exceed 1.5w. this can easily be exceed - ed with even moderate output current if the load voltage is high and the load resistance is low. the jp1 connector determines the current-limit range and step size. note: do not operate the board without a shunt in place, in one of these two positions. see table 5. software and fpga code example software and drivers are available that execute directly without modification on several fpga devel - opment boards that support an integrated or synthe - sized microprocessor. these boards include the digilent nexys 3, avnet lx9, and avnet zedboard, although other platforms can be added over time. maxim provides complete xilinx ise projects containing hdl, platform studio, and sdk projects. in addition, a synthesized bit stream, ready for fpga download, is provided for the demonstration application. the software project (for the sdk) contains several source files intended to accelerate customer evalu - ation and design. these include a base application (maximmodules.c) that demonstrates module function - ality and uses an api interface (maximdevicespecific utilities.c) to set and access maxim device functions within a specific module. the source code is written in standard ansi c format, and all api documentation including theory/operation, register description, and function prototypes are documented in the api interface file (maximdevicespecificutilities.h & .c). the complete software kit is available for download at www.maxim-ic.com . quick start instructions are also available as a separate document. table 5. jumper jp1 (current-limit range) MAX9611PMB1 peripheral module
ou t 1 rs+ 2 rs- 3 se t 4 gn d 5 scl 6 sd a 7 a1 8 a0 9 vc c 10 m ax9 61 1 u2 d s g si 2 303 cd s q1 8. 06k1 % r1 2 4. 02k r1 0 40 2 1% r1 1 0. 21 % 2 wa tt r1 3 7. 5k 1% r8 4. 7k 1% r3 sens e re si st or gn d sd a sc l gn d gn d vc c2 vc c2 vc c2 gn d ou t 1 gn d 2 vd d 3 sd a 4 sc l 5 ma x5 38 0 u1 sd a scl gn d vc c2 gn d vc c2 gn d vd ac vs et 84 5 1% r9 1 2 3 jp 1 vd ac 1 2 3 jp 2 4. 7k r4 10 k r1 4 gn d gn d vc c2 1 2 3 jp 3 gn d gn d vc c2 gn d po we r so ur ce lo ad 10 k r1 5 4. 7k r5 vd ac 10 vd ac 10 0. 1uf c1 0. 1u f c2 1u f c6 0. 1uf c3 4. 7u f c4 0. 01uf c7 1 2 3 j3 gn d gr ou nd scl sd a gn d vc c 1 2 3 4 5 6 j1 1 2 3 4 5 6 7 8 j2 vc c2 1 3 2 em ifil t f1 gn d 10 uf c5 gn d 15 0 r6 15 0 r7 4. 7k r2 4. 7k r1 vc c i2 c ex pans io n co nnec to r vc c i2 c ad dr es s se le ct io n _________________________________________________________________ maxim integrated products 5 figure 2. MAX9611PMB11 peripheral module schematic MAX9611PMB1 peripheral module
_________________________________________________________________ maxim integrated products 6 figure 3. MAX9611PMB11 peripheral module component placement guidecomponent side figure 4. MAX9611PMB11 peripheral module pcb layoutcomponent side figure 5. MAX9611PMB11 peripheral module pcb layoutinner layer 1 (ground) MAX9611PMB1 peripheral module
_________________________________________________________________ maxim integrated products 7 figure 6. MAX9611PMB11 peripheral module pcb layoutinner layer 2 (power) figure 7. MAX9611PMB11 peripheral module pcb layoutsolder side figure 8. MAX9611PMB11 peripheral module component placement guidesolder side MAX9611PMB1 peripheral module
part type MAX9611PMB1# peripheral module _________________________________________________________________ maxim integrated products 8 ordering information # denotes rohs compliant. MAX9611PMB1 peripheral module
revision number revision date description pages changed 0 5/12 initial release maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 9 ? 2012 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. revision history MAX9611PMB1 peripheral module
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