ZHCSJK5C January 2018 – October 2020 TCAN4550-Q1
The INH pin is a high voltage output pin that provides voltage from the VSUP minus a diode drop to enable an external high voltage regulator. These regulators are usually used to support the microprocessor and VIO pin. The INH function is on in all modes but sleep mode. In sleep mode the INH pin is turned off, going into a high Z state. This allows the node to be placed into the lowest power state while in sleep mode. If this function is not required it can be disabled by setting register 16'h0800 = 1 using the SPI interface. If not required in the end application to initiate a system wake-up, INH can be left floating.
This terminal should be considered a "high voltage logic" terminal. It is not a power output thus should be used to drive the EN terminal of the system’s power management device. It should be not used as a switch for power management supply itself. This terminal is not reverse battery protected and thus should not be connected outside of the system module.