# Board layout and jumper settings The following figure shows the top view of QCC743M, QCC744M and QCC748M boards. Page-1 Rectangle.196 Sheet.1 Sheet.3 Sheet.4 Circle.37 1 1 Circle.38 2 2 Circle.39 3 3 Circle.40 4 4 Circle.41 5 5 Circle.42 6 6 Circle.43 7 8 Circle.44 8 9 Circle.45 9 10 Sheet.14 J3: 2-pin header jumper J3: 2-pin header jumper Sheet.15 J4: 3-pin header jumper J4: 2-pin header jumper Sheet.16 J5: 1.8V power measurement J5: 1.8 V power measurement Sheet.17 J6: 3.3V power measurement J6: 3.3 V power measurement Sheet.18 J9: USB-C Direct J9: USB-C Direct Sheet.19 Power LED Power LED Sheet.20 S1: BOOT S1: BOOT Sheet.21 S2: RESET S2: RESET Sheet.22 J1: USB-C UART J1: USB-C UART Rectangle Circle 1 1 Rectangle.7 Rectangle.8 Rectangle.10 Sheet.29 Sheet.30 Sheet.31 Sheet.32 Sheet.33 Sheet.34 Sheet.35 Sheet.36 Sheet.37 Sheet.38 Sheet.39 Sheet.40 Sheet.44 Sheet.45 Sheet.46 Circle.19 4 4 Circle.26 6 6 Circle.17 3 3 Circle.15 2 2 Rectangle.9 Sheet.111 Sheet.112 Sheet.113 Sheet.114 Sheet.115 Sheet.116 Circle.117 5 5 Rectangle.118 Rectangle.135 Sheet.136 Sheet.137 Sheet.138 Circle.139 9 10 Circle.150 7 8 Sheet.151 Sheet.152 Sheet.153 Rectangle.154 Rectangle.155 Sheet.156 Sheet.157 Sheet.158 Circle.159 8 9 Sheet.197 J3: 2-pin header jumper QCC743M board Sheet.199 J3: 2-pin header jumper QCC744M board Circle.200 1 1 Rectangle.201 Rectangle.202 Rectangle.203 Sheet.204 Sheet.205 Sheet.206 Sheet.207 Sheet.208 Sheet.209 Sheet.210 Sheet.211 Sheet.212 Sheet.213 Sheet.214 Sheet.215 Sheet.216 Sheet.217 Sheet.218 Circle.219 4 4 Circle.220 6 6 Circle.221 3 3 Circle.222 2 2 Rectangle.223 Sheet.224 Sheet.225 Sheet.226 Sheet.227 Sheet.228 Sheet.229 Circle.230 5 5 Rectangle.231 Rectangle.232 Sheet.233 Sheet.234 Sheet.235 Circle.236 9 10 Circle.237 7 8 Sheet.238 Sheet.239 Sheet.240 Rectangle.241 Rectangle.242 Sheet.243 Sheet.244 Sheet.245 Circle.246 8 9 Rectangle.247 Circle.345 1 1 Rectangle.346 Rectangle.347 Rectangle.348 Sheet.349 Sheet.350 Sheet.351 Sheet.352 Sheet.353 Sheet.354 Sheet.355 Sheet.356 Sheet.357 Sheet.358 Sheet.359 Sheet.360 Sheet.361 Sheet.362 Sheet.363 Circle.364 4 4 Circle.365 6 6 Circle.366 3 3 Circle.367 2 2 Rectangle.368 Sheet.369 Sheet.370 Sheet.371 Sheet.372 Sheet.373 Sheet.374 Circle.375 5 5 Rectangle.376 Rectangle.377 Sheet.378 Sheet.379 Sheet.380 Circle.381 9 10 Circle.382 7 8 Sheet.383 Sheet.384 Sheet.385 Rectangle.386 Rectangle.387 Sheet.388 Sheet.389 Sheet.390 Circle.391 8 9 Rectangle.392 Sheet.393 J3: 2-pin header jumper QCC748M board Rectangle.394 Rectangle.395 Rectangle.396 Sheet.397 Sheet.398 Sheet.399 Sheet.400 Sheet.401 Sheet.402 Sheet.406 Sheet.407 Sheet.408 Sheet.409 Sheet.410 Sheet.411 Sheet.412 QCC743M LGA module QCC743M LGA module Sheet.413 QCC744M LGA module QCC744M LGA module Sheet.414 QCC748M LGA module QCC748M LGA module Rectangle.427 Sheet.428 Sheet.429 Sheet.430 Circle.431 6 7 Circle.432 6 7 Sheet.433 Power LED VDD33 LED Rectangle.434 Sheet.435 Sheet.436 Sheet.437 Circle.438 8 7 Rectangle.439 Sheet.440 Sheet.441 Sheet.442 Circle.443 6 7 **Figure: Top view of QCC743M, QCC744M, and QCC748M boards** The following table summarize the jumper settings used to configure GPIO routing, JTAG and UART signals, and I/O voltage options on the board. Jumper configuration (QCC743M EVK 4.1 and QCC744M/QCC748M EVK 3.1) | Jumper | Pin 1 | Pin 2 | Description | | --- | --- | --- | --- | | J3 | 1 | 2 | GPIO2 connected to CH347-DTR1 | | J3 | 3 | 4 | GPIO2 connected to CH347-TDO (JTAG) | | J3 | 5 | 6 | GPIO1 connected to CH347-TCK (JTAG) | | J3 | 7 | 8 | GPIO3 connected to CH347-TDI (JTAG) | | J3 | 9 | 10 | GPIO0 connected to CH347-TMS (JTAG) | | J3 | 11 | 12 | GPIO22 connected to CH347-TXD1 (UART) | | J3 | 13 | 14 | GPIO21 connected to CH347-RXD1 (UART) | | J3 | 15 | 16 | GPIO28 connected to CH347-CTS1 (UART) | | J3 | 17 | 18 | GPIO29 connected to CH347-RTS1 (UART) | | J4 | 1 | 2 | 3.3 V connected to chip VDD33 | | J4 | 3 | 5 | VDDIO2 set to 3.3 V | | J4 | 5 | 7 | VDDIO2 set to 1.8 V | | J4 | 4 | 6 | VDDIO1 set to 3.3 V | | J4 | 6 | 8 | VDDIO1 set to 1.8 V | | J4 | 9 | 11 | GPIO30 connected to CHIP\_EN (RESET button - S2) | | J4 | 11 | 13 | CHIP\_EN connected to CH347-RTS1 | | J4 | 10 | 12 | CH347F VIO set to 1.8 V | | J4 | 12 | 14 | CH347F VIO set to 3.3 V | | J4 | 15 | 16 | USB host feature not supported (QCC743M/QCC744M); Connect to enable USB host feature (QCC748M) | | J4 | 17 | 18 | USB supply connected to LDO/BUCK | The default configuration has the jumper connected to 3.3 V for I/O supply during current measurement. To use the 1.8 V I/O supply for current measurement, configure the jumper settings as follows: - J4: connect pins 5 and 7 together. - J4: connect pins 6 and 8 together. Last Published: May 06, 2026 [Previous Topic Module feature comparison](https://docs.qualcomm.com/bundle/publicresource/80-WL740-251/topics/feature-comparison.md) [Next Topic LEDs and buttons](https://docs.qualcomm.com/bundle/publicresource/80-WL740-251/topics/leds-buttons.md)