TPS38700 device comes preprogrammed with the power up, power down, sleep entry, and sleep exit sequences shown in Table 9-1 and Table 9-2.
NIRQ and NRST pins both require a pull up resistor in the range of 10 kΩ to 100 kΩ.
SDA and SCL lines require pull up resistors in the range of 10 kΩ.
The ACT pin is driven by an external safety microcontroller. When the ACT pin is driven high, the device enters into ACTIVE mode as described in Section 8.3.6.1. When the ACT pin is driven low, the device enters into SHDN mode as described in Section 8.3.6.5.
The safety microcontroller is used to clear fault interrupts reported through the NIRQ interrupt pin and the INT_SCR1 and INT_SCR2 registers. The interrupt flags can only be cleared by the host micrcontroller with a write-1-to-clear operation; interrupt flags are not automatically cleared if the fault condition is no longer present.
The SLEEP pin is driven by the SOC. When the SLEEP pin is driven low, the device enters into Sleep mode as shown in Section 8.3.6.3. When the SLEEP pin is driven high, the device exits Sleep mode as shown in Section 8.3.6.4.
The safety microcontroller should be connected to the NEM_PD input pin of the TPS38700 device in order to enable emergency power down functionality. When this pin is driven low, the TPS38700 device will enter into power down sequence. Power down due to NEM_PD is shown in Figure 8-12.