general description the DS3900P2 programmer provides bidirectional com - munication with i 2 c-compatible devices using a pcs usb port. the DS3900P2 is a small form-factor module that requires appropriate headers to pass communica - tion signals to the device under test. the DS3900P2 is intended to interface with approved human interface device (hid)-compliant pc software designed by maxim integrated. it is intended for evaluation purposes only. ev kit contents assembled DS3900P2 circuit board micro-usb cable ribbon cable features communicates from pcs to ics and select maxim integrated ev kits through a usb port using the hid class fast communication to i 2 c-compatible devices built-in pullup resistors for sda and scl minimize required external hardware connection to standard prototyping boards and ev kits possible using header connectors fully usb powered can provide a 3.3v, 250ma power rail fully assembled and tested proven pcb layout usb hid interface for windows xp?-, windows vista?-, and windows? 7-compatible software rohs compliant 19-6778; rev 0; 8/13 ordering information appears at end of data sheet. windows, windows vista, and windows xp are registered trademarks of microsoft corp. DS3900P2 usb i 2 c programmer usb hid communications module for i 2 c programming DS3900P2
maxim integrated 2 quick start required equipment DS3900P2 ev kit hardware (included) micro-usb cable (included) user-supplied pc with windows xp , windows v ista, or windows 7 os with usb port approved pr eviously des igned hi d-compliant g ui designed by maxim integrated customer pcb with i 2 c connection or a previously purchased compatible maxim integrated ev kit setup procedure the DS3900P2 communicates with ics using a pcs usb port. the microprocessor on the DS3900P2 com - municates to the pc using its full-speed compatible usb serial interface engine. the usb interface of the DS3900P2 hardware is configured as an hid device and, therefore, does not require a unique/custom device driver. once properly connected to a pc through a usb cable, windows should automatically begin installing the necessary device driver. once the driver installation is complete, a windows message appears near the system icon menu indicating that the hardware is ready to use. after the hardware is ready to use, open an approved hid-compliant gui designed by maxim integrated. the gui then sends commands of various lengths over the usb connection. this provides instruction and data for the DS3900P2 to communicate with the i 2 c-compatible devices. the DS3900P2 has a 3.3v ldo that supplies power to the microcontroller and optionally to a connected ev kit or pcb. the 3.3v rail supplies up to 250ma. detailed description of hardware designing hardware to use the built-in support for i 2 c devices the DS3900P2 has custom firmware that uses either the master synchronous serial port (mssp) of the microcon - troller configured in i 2 c mode or several bit-banging rou - tines with support for clock stretching. these two modes of operation are configured through the evaluation software. the DS3900P2 has built-in pullup resistors (r11, r12) that connect 10k ? resistors to both i 2 c signals. upon initial power-up, the DS3900P2 configures itself in i 2 c mode using the mssp block of the microcontroller with a scl clock speed of 400khz. note that most evalu - ation software configures the DS3900P2 to the desired communication protocol upon initial software execution and during all usb reconnects of the DS3900P2. for designs that use the DS3900P2 to communicate to i 2 c devices, the following items must be accounted for in the hardware design: place an appropriate connection on the circuit board. connect gnd, scl, and sda. 3.3v can also be con - nected if the DS3900P2 is providing power to the circuit board. drive the DS3900P2 with evaluation software provided by maxim integrated. note: the DS3900P2 ribbon cable mates with stan - dard 2.54mm (0.100in) 2 x 4 male header connectors. some maxim integrated ev kits provide a 1 x 4 male header for this connection. note 1: all voltages listed are with respect to ground. note 2: devices are only functionally tested; parameters listed are not guaranteed. table 1. recommended operating conditions (typical values are at v cc = 3.3v, t a = +25oc, unless otherwise noted.) (notes 1, 2) parameter symbol conditions min typ max units operating voltage v cc 3.3 v supply current i cc current provided by 3.3v 250 ma input low voltage v il 0.15v cc v input high voltage v ih 0.25v cc + 0.8v v output low voltage v ol i ol = 8.5ma +0.6 v ambient temperature t a -40 +85 oc i 2 c clock frequency 100 400 khz www.maximintegrated.com usb hid communications module for i 2 c programming DS3900P2
maxim integrated 3 figure 1. recommended pcb connection for DS3900P2 table 2. pin description pin function 3.3v power supply that can be used to power ev kit or customer pcb. sda data input/output for i 2 c-compatible communication. gnd ground connection. this must be connected to ev lit or customer pcb. scl clock output for i 2 c-compatible communication. www.maximintegrated.com usb hid communications module for i 2 c programming DS3900P2
maxim integrated 4 troubleshooting all ef forts were made to ensure that the DS3900P2 works on the first try, right out of the box. in the rare occasion that a problem is suspected, refer to t able 4 to trouble - shoot the issue. DS3900P2 revisions revisions yielding significant changes and/or improve - ments are tracked in firmware and are displayed in most evaluation software provided by maxim integrated. revision is broken up into a major and minor revision. for example, if the DS3900P2s revision is 3.2, it returns a major revision of 3, a minor revision of 2. knowing the revision allows the software to utilize new functions that are not available in previous versions of the DS3900P2s firmware and to avoid using commands that are not present in prior versions. although there are no plans to change the firmware at this time, maxim integrated reserves the right to change the firmware at any time without notice. intended use the DS3900P2 module is intended only to be used to evaluate maxim integrated circuits. all hardware, firm - ware, and any relative software is provided as is, without warranty of any kind, express or implied, including, but not limited to, the warranties of merchantability, fitness for a particular purpose, and noninfringement. in no event shall maxim integrated be liable for any claim, damages or other liability, whether in an action of contract, tort or otherwise, arising from, out of, or in connection with the hardware, firmware, and any relative software or the use or other dealings in the hardware, firmware, and any rela - tive software. table 3. description of leds table 4. troubleshooting the DS3900P2 led color description d1 (power) green usb power fault. the usb power is connected. red usb power fault. a fault occurred due to overvoltage limit, current limit, or thermal limit. d2 (com) green waiting. software has initialized the hardware. waiting for user data to be sent from the gui. red communication. after the software has initialized the hardware, the led fashes red when a command from the pc is received. flashing red and orange waiting. hardware is powered on and waiting for the software to be opened symptom check solution windows does not detect hardware. is the led labeled d1 on the DS3900P2 red? if yes, then the electronic fuse is in a fault state. inspect for electrical shorts on the pcb and ensure that the pcb is not sitting on a conductive surface. usb cable and port? try connecting the usb cable to a different usb port on the pc and wait for a windows message that indicates that the hardware is ready to use. if the device is not detected, unplug the usb cable and reboot the pc. connect the usb cable. are any of the leds illuminated? if not, then the pcb may not be getting power. ensure bias is applied to vcc and all three gnd terminals are connected to system ground. verify the usb cable is connected to a pc. www.maximintegrated.com usb hid communications module for i 2 c programming DS3900P2
maxim integrated 5 figure 2. DS3900P2 schematic m clr 1 p 3, hb 2 com_led, bo ot 3 p1 4 p2 5 rcv 6 p6, cs 7 gnd 8 o sc1 9 o sc2 10 p4 11 uoe 12 p s_v ar 13 v usb 14 d- ,vm 15 d +, vp 16 enum 17 p 9, sdo 18 gnd 19 vdd 20 p 11,sd i, sda 21 p 10,sc k,scl 22 vmo 23 vpo 24 u sb _det 25 p5 26 p 7,1 w_ dq 27 p 8,1w_pu 28 u1 picfor d s3900 r3 560 r8 330 r9 330 r10 2.2k r11 10k r12 10k c3 10uf c14 0.1uf c13 1uf c2 10uf c1 10uf c12 220nf c9 0.01uf d- d+ vbus 3. 3v d+ d- scl sda r13 4.7k 1 2 j2 dnp vpp o sc1 hb com green d2b red d2a com inh 1 gnd 2 out 3 vcc 4 i nh i i g nd g g o ut v cc x1 o sc_cmos_4pin clk r4 100k red d1a green d1b r5 560 c4 0.01uf r7 10k r6 45. 3k out 1 gnd 2 s eti 3 on 4 in 5 flag 6 o u t g n d g g s eti o n i n i i f l a l l g u2 max 4995a in 1 gnd 2 en 3 gs 4 pok 5 fb 6 byp 7 out 8 i n i i g nd g g en g s p ok f b b y p o ut u3 max8902b gnd 25 0 ma cur rent l imi t v3.3 hctiws ldo re gulator microcontro ll er 3. 3v 3. 3v 3. 3v 3. 3v 3. 3v 1 2 3 4 u4 s r05 1 2 d4 d b2w3 1900l 3. 3v sda scl 3. 3v gnd gnd gnd gnd gnd 1 2 3 4 5 6 7 8 j3 hdr _8p in +5v v bus 1 d- 2 d+ 3 i.d. 4 gnd 5 j1 micr o usb www.maximintegrated.com usb hid communications module for i 2 c programming DS3900P2
maxim integrated 6 figure 3. DS3900P2 pcb layouttop figure 4. DS3900P2 pcb layoutbottom www.maximintegrated.com usb hid communications module for i 2 c programming DS3900P2
maxim integrated 7 comment designator qty description 10f c1, c2, c3 3 10f ceramic capacitors (0805) taiyo yuden emk212abj106kd-t 0.01f c4, c9 2 0.01f ceramic capacitors (0805) murata grm21br72a103k 0.22f c12 1 0.22f ceramic capacitors (0805) tdk corp. c2012x7r1h224k 1.0f c13 1 1.0f ceramic capacitors (0805) tdk corp. c2012x7r1h105k/soft 0.1f c14 1 0.1f ceramic capacitors (0805) tdk corp. cga4j2x7r2a104k led_dual d1, d2 2 red/green dual leds kingbright aphbm2012surkcgkc schottkey d4 1 schottky diode panasonic - ssgdb2w31900l micro usb j1 1 5-pin micro-usb molex 105017-0001 hdr_8pin j3 1 8-pin header 3m 961208-6404-ar 560 r3, r5 2 560 1% resistors (0805) vishay/dale crcw0805560rfkea 100k r4 1 100k 1% resistors (0805) vishay/dale crcw0805100kfkea 45.3k r6 1 45.3k 1% resistors (0805) vishay/dale crcw080545k3fkea 10k r7, r11, r12 3 10k 1% resistors (0805) vishay/dale crcw080510k0fkea 330 r8, r9 2 330 1% resistors (0805) vishay/dale crcw0805330rfkea 2.2k r10 1 2.2k 1% resistor (0805) vishay/dale crcw08052k20fkea 4.7k r13 1 4.7k 1% resistor (0805) vishay/dale crcw08054k70fkea ds3900_pic u1 1 microprocessor microchip pic18lf2550-i/so max4995a u2 1 current-limit switch (6 sot) maxim integrated max4995aaut+ max8902b u3 1 low-noise, ldo regulator (8 tdfn-ep) maxim integrated max8902bata+ sr05 u4 1 tvs diode array littelfuse sr05-02ctg 48mhz x1 1 4-pin cmos oscillator avx kc3225a48.0000c30e00 1 pcb: DS3900P2 usb i2c programmer component list www.maximintegrated.com usb hid communications module for i 2 c programming DS3900P2
maxim integrated 8 # denotes a rohs-compliant device that may include lead that is exempt under the rohs requirements. part type DS3900P2evkit# ev kit communications module ordering information www.maximintegrated.com usb hid communications module for i 2 c programming DS3900P2
? 2013 maxim integrated products, inc. 9 revision number revision date description pages changed 0 8/13 initial release revision history 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 specifcations without notice at any time. maxim integrated and the maxim integrated logo are trademarks of maxim integrated products, inc. usb hid communications module for i 2 c programming DS3900P2 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim integrateds website at www.maximintegrated.com.
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