STPM066S datasheet(22/67 Pages) STMICROELECTRONICS

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Figure 11. Watchdog Early, Safe and Late window diagram

TSWn = Safe window #1..4

TEFWn = Early Failure window #1..4

TLFWn = Late failure window #1..4

TLFWn_min

TSWn_max

tim

safe trigger area

Late

Watchdog

Failure

undefined

TEFWn_max

Earl

Watchdog

Failure

TSWn_min

GAPG1502160942PS

4.2.10

Under-Voltage, Over-Voltage and Power-Good

All regulators are monitored and Power-Good, Over-Voltage and Under-Voltage information is provided through

SPI.

One SPI bit allows to select between two threshold options for each regulator.

Over-voltage and Power-Good are checked when the signal is rising, the Under-Voltage is valid when the signal is

falling.

4.2.11

Temperature control and VBATx voltage through internal ADC

In order to provide an advanced on-chip temperature control, power outputs are grouped in 7 clusters with

dedicated thermal sensors. The sensors are suitably located on the device (see Section 4.2.5 ADC). In case

the temperature of a cluster reaches the thermal shutdown threshold, the event is written in the register, the fault

pin is activated, and the single regulator is switched off (all other outputs remain active). In particular, what is

described below takes place.

Thermal Cluster TH1: in case the temperature of TH1 reaches the thermal shutdown threshold, the device moves

to REC mode. The corresponding SPI bit is set and the FAULT pin is asserted.

Thermal Clusters TH3 (buck), TH5 (boost), TH6 (ldo): in case the temperature reaches the thermal shutdown

threshold, the single regulator is shut down. The power stage is switched OFF with a 16 μs filter time. The output

decreases and, when the UV is detected, the buck goes in REC state and can be restarted only when the OT flag

is reset. The corresponding SPI bit is set and the FAULT pin is asserted. In case the thermal shutdown condition

is suspended before the UV is detected, the regulator output turns on again. If the boost or the ldo is not enabled,

in case its temperature reaches the thermal shutdown threshold, the corresponding SPI bit is set and the FAULT

pin is asserted.

Thermal Clusters TH2, TH4: in case the temperature of a cluster reaches the thermal shutdown threshold the

corresponding SPI bit is set and the FAULT pin is asserted.

Thermal Cluster TH7: in case the temperature of TH7 reaches the thermal shutdown threshold, the corresponding

SPI bit is set and the FAULT pin is asserted.

STPM066S

Voltage regulators and features description

DS12976 - Rev 2

page 22/67

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