CH9102F USB-to-UART Bridge
USB 2.0 full-speed to UART bridge with modem control signals and GPIOs. QFN-24 4x4mm package, 0.5mm pitch, backplane pad listed as pin 0.
Aliase:CH9102X
QFN-24 Top View
25 Pins
Pinout Table25
| Pin | Signal / Name | Type | Alternative Functions |
|---|---|---|---|
| 0 | GND | Ground | Backplane ground pad, optional but recommended connection |
| 1 | ~RI | Digital | Modem ring indicator input, active low |
| 2 | GND | Ground | Ground, connected directly to USB bus ground |
| 3 | UD+ | Digital | USB D+ signal, connect directly without series resistor |
| 4 | UD- | Digital | USB D- signal, connect directly without series resistor |
| 5 | VIO | Power | I/O power supply input, requires decoupling capacitor |
| 6 | V3 | Power | Internal regulator output and kernel/USB power input |
| 7 | VDD5 | Power | 5V power supply input, requires decoupling capacitor |
| 8 | VBUS | Digital | USB VBUS status detection input, internal pull-down |
| 9 | ~RST | Digital | External reset input, active low, internal pull-up |
| 10 | ~ACT | Digital | USB configuration completed state output, active low |
| 11 | ~WAKEUP/GPIO3 | Digital | USB wake-up event input, active low, internal pull-upGeneral GPIO3, direction set by driver software |
| 12 | TNOW/GPIO2 | Digital | Serial port transmit-in-progress status output, active highGeneral GPIO2, direction set by driver software |
| 13 | RXS/GPIO1 | Digital | RXD receive status outputGeneral GPIO1, direction set by driver software |
| 14 | TXS/GPIO0 | Digital | TXD transmit status outputGeneral GPIO0, direction set by driver software |
| 15 | ~SUSPEND | Digital | USB suspend state output, active low |
| 16 | GPIO4 | Digital | General GPIO4, direction set by driver software |
| 17 | SUSPEND | Digital | USB suspend state output, active high |
| 18 | ~CTS | Digital | Modem clear to send input, active low |
| 19 | ~RTS | Digital | Modem request to send output, active low |
| 20 | RXD | Digital | Asynchronous serial data receive input, internal pull-up |
| 21 | TXD | Digital | Asynchronous serial data transmit output, idle high |
| 22 | ~DSR | Digital | Modem data set ready input, active low |
| 23 | ~DTR | Digital | Modem data terminal ready output, active low |
| 24 | ~DCD | Digital | Modem data carrier detect input, active low |