The 24-pin flex connector was added to each verdex pro computer-on-module (and verdex) in response to customer demand for a daughtercard on the 80-pin side of the COM that provides UART and USB host functions on the same side. These functions are normally located on the other side of the module as "60-pin" type functions.
FH12A-24S-0.5SH(55) Digikey part HFK124CT-ND
With a flat flex cable, it is possible to bring those functions from the 24-pin flex connector on to a custom board on the 80-pin side of the verdex pro com in order to reduce the thickness of the multi-board "sandwich".
With a flat flex cable, it is possible to bring those functions from the 24-pin flex connector on to a custom board on the 80-pin side of the verdex pro com in order to reduce the thickness of the multi-board "sandwich".
The 24-pin flex connector addresses several issues:
- being able to get a console while the computer-on-module is otherwise in use without the physical limitations of the tweener.
- USB Host.
- Battery for RTC.
- Daughtercards that need a flex connector.
Digikey sells a connector and cable that fits the 24 pin connector:
- flex connector - HFK124CT-ND
- flex cable - HFF-24U-03-ND
The part Gumstix uses on the COM is FH12A-24S-0.5SH(55) from Hirose. You can find a footprint of this connector for pcb/gEDA here (CON_FPC-50P-24C-1R-24N__Hirose_FH12-24S-0.5SH). There are many possible lengths and configurations of the interconnecting flex cables; also, you have many choices of connectors to use on your own board.
Ribbon cable: Flat Flex Jumper
Pitch: 0.5 mm (0.020")
Contacts: 24
| Pin |
GPIO |
·Signal |
| 1 |
GPIO(2) |
·SYS_EN |
| ·2 | ·GPIO(12) | ·BT_NRESET |
| ·3 | ·GPIO(43) | ·BT_TXD |
| ·4 | ·GPIO(42) | ·BT_RXD |
| ·5 | GPIO(44) | ·BT_CTS |
| ·6 | ·GPIO(45) | ·BT_RTS |
| ·7 | ·GPIO(9) | ·CLK_32 |
| ·8 | · | ·GND |
| ·9 | ·GPIO(38) | ·SSPTXD3 |
| ·10 | ·GPIO(41) | · SSPRXD3_OTG_ID |
| ·11 | ·GPIO(35) | · SSPSFRM3 |
| ·12 | ·GPIO(40) | ·SSPSCLK3 |
| ·13 | ·GPIO(94) | · |
| ·14 | ·GPIO(118) | I2C_SDA |
| ·15 | ·GPIO(117) | ·I2C_SCL |
| ·16 | ·GPIO(0) | · |
| ·17 | · | USBH_P1 |
| ·18 | · | USBH_N1 |
| ·19 | ·GPIO(89) | ·USBH_PEN1 |
| ·20 | ·GPIO(88) | ·USBH_PWR1 |
| ·21 | · | ·V_BACKUP_BATT |
| ·22 | ·GPIO(47) | · IR_TXD |
| ·23 | ·GPIO(46) | ·IR_RXD |
| ·24 | · | ·V_BATT |
