ZHCSEF7G December 2014 – February 2019 TPS659037
PRODUCTION DATA.
The TPS659037 device integrates an embedded power controller (EPC) that fully manages the state of the device during power transitions. According to four defined types of requests (ON, OFF, WAKE, and SLEEP), the EPC executes one of the five predefined power sequences (OFF2ACT, ACT2OFF, SLP2OFF, ACT2SLP, and SLP2ACT) to control the state of the device resources. Any resource can be included in any power sequence. When a resource is not controlled or configured through a power sequence, the resource remains in the default state of the resource (from OTP).
Each resource is configured only through register bits. Therefore, a resource can be controlled statically by the user through the control interfaces (I2C or SPI) or controlled automatically by the EPC during power transitions (predefined sequences of registers accesses).
The EPC is powered by an internal LDO that is automatically enabled when VSYS is available to the device. Ensuring that the VSYS pin (which is connected to VCC1, VCC_SENSE, SMPSx_In and LDOx_IN as suggested in Section 5.2) is the first supply available to the device is important to ensure proper operation of all the power resources provided by the TPS659037 device. Ensuring that the VSYS pin is stable prior to the VIO supply becoming available is important to ensure proper operation of the control interface and device IOs.