ZHCS034C January 2011 – August 2018 TCA4311A
PRODUCTION DATA.
| PIN | DESCRIPTION | |
|---|---|---|
| NAME | NUMBER | |
| EN | 1 | Active-high chip enable pin. If EN is low, the TCA4311A is in a low current (<1 μA) mode. It also disables the rise-time accelerators, disables the bus pre-charge circuitry, drives READY low, isolates SDAIN from SDAOUT and isolates SCLIN from SCLOUT. EN should be high (at VCC) for normal operation. Connect EN to VCC if this feature is not being used. |
| SCLOUT | 2 | Serial clock output. Connect this pin to the SCL bus on the card. |
| SCLIN | 3 |
Serial clock input. Connect this pin to the SCL bus on the backplane. |
| GND | 4 | Supply ground |
| READY | 5 | Connection flag/rise-time accelerator control. READY is low when either EN is low or the start-up sequence described in the operation section has not been completed. READY goes high when EN is high and start-up is complete. Connect a 10-kΩ resistor from this pin to VCC to provide the pull up. |
| SDAIN | 6 | Serial data input. Connect this pin to the SDA bus on the backplane. |
| SDAOUT | 7 | Serial data output. Connect this pin to the SDA bus on the card. |
| VCC | 8 | Supply power. Main input power supply from backplane. This is the supply voltage for the devices on the backplane I2C busses. Connect pull-up resistors from SDAIN and SCLIN (and also from SDAOUT and SCLOUT) to this pin. Place a bypass capacitor of at least 0.01 μF close to this pin for best results. |