SLUSDQ4 April 2019 BQ79606A-Q1
The TSREF is a 2.5V buffered REF1 reference that supplies the GPIO* linearization circuits when measuring external temperature sensors. This allows the ADC to operate from the same reference and provide a ratiometric result for GPIO*. TSREF is capable of supplying up to ITSREF current limit and must not be used to power any circuits other than the resistor dividers for GPIO*. Enable TSREF using the CONTROL2[TSREF_EN] bit. The startup time for TSREF is determined by the external capacitance and the current limit. The time is calculated using the simple capacitor charging equation. No GPIO measurements should be taken until TSREF is settled at the regulation point.
See Ratiometric Measurement Configuration for details on selecting the resistors. TSREF contains an over-voltage comparator that signals a fault (RAIL_FAULT[TSREFOV]) when the voltage at TSREF rises above VTSREFOV. Additionally, TSREF contains an under-voltage circuit that signals a fault (RAIL_FAULT[TSREFUV]) when TSREF drops below VTSREFUV. Additionally, TSREF is continuously monitored for abnormal oscillations that can result in undersired operation. If such an oscillation occurs, the SYS_FAULT2[TSREF_OSC] bit is set.