SLVSF02D March 2019 – May 2020 TPS23881
TPS23881 devices are used in the eight port configuration and are managed by the I2C host device. The I2C address for TPS23881 is programmed using the A4..A1 pins. When using multiple TPS23881 devices in a system, each device requires by a unique I2C address. See PIN STATUS Register for more information on how to program the TPS23881 I2C address.
Figure 122 and Figure 123 show typical application for either all 2-pair or 4-pair ports, but the TPS23881 may also be configured to support any combination of either 2-pair or 4-pair PSE ports. 4-pair port requires the use of both Alternative A and Alternative B wire pair sets at the RJ45 terminal, whereas a 2-pair port only requires the Alternative A pair set to be used.
A MCU is not required to operate the TPS23881 device, but some type of I2C master/host controller device is required to program the internal SRAM and initialize the basic I2C register configuration of the TPS23881.
It is recommended that the RESET pin be connected to a micro-controller or other external circuitry.
The RESET pin must be held low until both VPWR and VDD are above their UVLO thresholds.
Refer to the TPS23881EVM User's Guide for more detailed information.