ZHCSI09S June 2010 – August 2018 TPS65911
The TPS65911 device can provide a 32-kHz clock to the platform through the CLK32KOUT output, when a crystal is connected.
Alternatively, the device can accept a square-wave 32-kHz clock signal applied to OSC32IN input (OSC32KOUT kept floating) and gate the clock to CLK32OUT. This clock must be present for any state of the EPC except the NO SUPPLY state. The TPS65911 device also has an internal 32-kHz RC oscillator to decrease the BOM if an accurate clock is not needed by the system.
Default selection of a 32-kHz RC oscillator versus 32-kHz crystal oscillator or external square-wave
32-kHz clock depends on the boot configuration setting for the CK32K_CTRL bit.
Switching from the 32-kHz RC oscillator to the 32-kHz crystal oscillator or external square-wave 32-kHz clock can also be programmed though the DEVCTRL_REG register.