L9952XP datasheet(14/68 Pages) STMICROELECTRONICS

14 / 68 page

Description

L9952GXP

14/68

Doc ID 13518 Rev 5

2.4

Functional overview (truth table)

Table 4.

Functional overview (truth table)

Function

Comments

Operating modes

Active mode

V1-standby

static mode

(cyclic sense)

VBAT-standby

static mode

(cyclic sense)

2.3.1

Voltage-regulator, V1

VOUT= 5V

On (1)

Supply the processor in low current mode

Off

2.3.2

Voltage-regulator, V2

VOUT= 5V

On / Off (2)

Only active when selected via SPI

On (2) / Off

2.3.3

Reset-generator

Off

2.3.4

Window watchdog

V1 monitor

Off if

(I_V1 < ICMP

and ICMP=0)

or ICMP = 1

Off

2.3.5

Wake up

Off (3)

Input Status can be read by SPI (Status Register 0); Inputs should be configured for static sense (Control

Active (4)

Unless disabled by SPI

2.3.6

HS-cyclic supply

Oscillator

timebase

On / Off

On (2) / Off

2.3.7

Relay driver

Off

2.3.8

Operational amplifiers

Off

2.3.9

LIN line driver

LIN 2.1

Off

2.3.10

LIN line receiver

2.3.11

FSO

Fail-safe

output

Hi – no error

Lo – WD or V1

fail

Hi – no error

Lo – WD or V1

fail (5)

Watchdog is active in V1 standby mode, until I(V1) is below ICMP current threshold

Lo -> because

V1= off

2.3.12

Oscillator

(6)

Activation = ON if cyclic sense is selected

(6)

2.3.13

Vs-Monitor

(7)

Cyclic activation = pulsed ON during cyclic sense

(7)

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