L9965P-FN datasheet(12/104 Pages) STMICROELECTRONICS

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3.1.1

SPI SLEEP commands

To force the device to go in a DEEP-SLEEP state, the following procedure shall be implemented:

1. MCU writes 0x77 into the SPECIAL_KEY register to enter partial go-to-sleep;

2. MCU writes 0xCC into the SPECIAL_KEY register to confirm go-to-sleep.

3.1.2

Diagnostics summary

This section describes in detail the enable/masking of all the diagnostic features implemented in the device,

according to the functional state.

Note:

Many diagnostics may be subject to user-defined configurations and/or enable. The following table assumes that

all diagnostics have been enabled in the device configuration.

Table 7. Diagnostics summary

State

ERBST

UV/OV

FENx

decoder

diag

Deployment

autoretry

Diag

routine

Oscillator

monitor

Reference

monitor

GND

loss

Config

integrity

check

OFF

DEEP

‑SLEEP

OFF

DIAG

AON

OFF

OD/CYC

AON

NORMAL

AON

OFF

AON

ARM

AON

OFF

AON

Note:

•

AON → Diagnostic always-on and running

•

OD → Diagnostic available on-demand

•

CYC → Diagnostic cyclically activated by internal timer

•

OFF → Diagnostic disabled/masked

3.2

Power management

The IC is supplied by ERBST pin, which is then used to generate all the internal regulated supplies.

The IC is usually supplied by an isolated DC/DC converter feeding from the 12 V LV supply (reinforced isolation);

alternatively by an isolated DC/DC converter from the HV battery pack.

3.2.1

Power management electrical parameters

All parameters are tested and guaranteed in the following conditions, unless otherwise noted: all supplies

according to the Table 3; TJ according to the Table 2.

L9965P

Functional description

DS14702 - Rev 4

page 12/104

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