ZHCSI09S June 2010 – August 2018 TPS65911
EN2 and EN1 are the data and clock signals of the serial control interface dedicated to voltage scaling applications.
These signals can also be programmed to be used as enable signals of one or several supplies, when the device is on (NRESPWRON high). A resource assigned to EN2 or EN1 control automatically disables the serial control interface.
Programming EN1_LDO_ASS_REG, EN2_LDO_REG, and SLEEP_KEEP_LDO_ON_REG registers: EN1 and EN2 signals can be used to control the turn on/off or SLEEP state of any LDO-type supplies.
Programming EN1_SMPS_ASS_REG, EN2_SMPS_ASS_REG, and SLEEP_KEEP_RES_ON registers: EN1 and EN2 signals can be used to control the turn on/off or LOW-POWER state (PFM mode) of SMPS-type supplies.
The EN2 and EN1 signals can be used to set the output voltage of VDD1 and VDD2 SMPS from a roof to a floor value, preprogrammed in the VDD1_OP_REG, VDD2_OP_REG and VDD1_SR_REG, VDD2_SR_REG registers.
When a supply is controlled through the EN1 or EN2 signals, its state is no longer driven by the device SLEEP state.