SPSB081 datasheet(25/135 Pages) STMICROELECTRONICS

25 / 135 page

•

Watchdog failure

•

Turn-on of the V1 regulator (VSREG power-on or wake-up from VBAT_standby mode)

3.9

DIAGN output

Figure 15. DIAGN pin

Data in

110 kΩ

Data out

GAPG1609151103CFT

DIAGN pin can be directly connected to the microcontroller and it is pulled up to V1 voltage by internal pull-up

resistor.

DIAGN pin can be configured by DIAGN_EXT bit in normal mode or extended mode.

In default DIAGN configuration (DIAGN_EXT =0), DIAGN pin is set low if a failure considered in fail safe mode

occurs (for example, watchdog failure; V1 failure; thermal shutdown TSD2).

As soon as the FS error source is cleared, the signal is pulled up to V1 voltage.

In extended DIAGN configuration (DIAGN_EXT =1), DIAGN pin reflects one or more errors such as reported in

the GLOBAL STATUS BYTE register by global status bit not (GSBN) and it is set to low if at least one error

condition occurs.

A bit register is available to mask each one of GSBN flags:

•

RSTB: MASK_RSTB (0x3F)

•

PLE: MASK_PLE (0x3F)

•

FE: MASK_FE (0x3F)

•

DE: MASK_DE (0x3F)

•

GW: MASK_GW (0x3F)

Note:

DIAGN is automatically configured in normal mode (DIAGN_EXT =0) after a reset event.

3.10

V1 overvoltage detection

SPSB081 protects the MCU against voltages over 5 V (or 3V3) that could harm its functionalities. For this

purpose, to sink the exceeding current accumulated in the external capacitor usually directed to the MCU, the

SPSB081 uses an internal pulldown circuit, where output current flows through the pulldown resistor to ground.

If the bit V1_OVP=1 in CR2 the overvoltage protection circuits is enabled. If V1_OVP =0 there is no overvoltage

protection anymore.

SPSB081

DIAGN output

DS14048 - Rev 1

page 25/135

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