ZHCS688I November 2011 – March 2018 TPS65217
PRODUCTION DATA.
The SLEEP state is a low-power mode of operation intended to support system standby. Typically, all power rails are turned off with the exception of the LDO1 rail, and the registers are reset to their default values. The LDO1 rail stays operational but can support only a limited amount of current (1 mA typical).
To go to the SLEEP state, set the OFF bit in the STATUS register to 0b (default), and then pull the PWR_EN pin low. All power rails controlled by the power-down sequencer are shut down, and after 1 s the device goes to the SLEEP state. If the LDO1 rail was enabled in the ACTIVE state, the LDO1 rail stays enabled in the SLEEP sate. All rails not controlled by the power-down sequencer also keep state. The battery charger stays active for as long as either the USB or AC supply is connected to the device. All register values are reset when the device goes to the SLEEP state, including charger parameters.
The device goes to the ACTIVE state after detecting a wake-up event as described in the previous sections. In addition, the device goes from the SLEEP to the ACTIVE state when the PWR_EN pin is pulled high. The system host can go between the ACTIVE and SLEEP states by control of the PWR_EN pin only. This feature bypasses the requirement for a wake-up event from an external source to occur.