UM1693 datasheet(49/196 Pages) STMICROELECTRONICS

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UM1693

Usage/handling of fault reset and standby

195

As indicated in Table 12 the VSENSEH failure flag is present on MultiSense pin of a latched

channel x, if the following conditions are met:

•

MultiSense is enabled (SEn = High)

•

The channel x is driven on through its input (INx = High)

•

The multiplexed MultiSense is mapped to channel x through appropriate SELx pin

settings

Note:

Off-state diagnostic is provided on the MultiSense, if INx = Low.

Table 11. Truth table

Mode

Conditions

INX

SEn

SELx

OUTx

MultiSense

Comments

Standby

All logic inputs

low

Hi-Z

Low quiescent

current consumption

Normal

Nominal load

connected:

Tj < TTSD

and

ΔTj < ΔTj_SD

Refer to Table 12

Refer to

Table 12

Outputs configured

for auto-restart

Outputs configured

for latch-off

Overload

Overload or

short to GND

causing:

Tj > TTSD

and

ΔTj > ΔTj_SD

Refer to Table 12

Refer to

Table 12

Output cycles with

temperature

hysteresis

Outputs latch-off

Undervoltage

VCC < VUSD

(falling)

Hi-Z

Re-start when

VCC > VUSD

+ VUSD hyst (rising)

OFF-state

diagnostics

Short to VCC

Refer to Table 12

Refer to

Table 12

Open-load

External pull-up

Negative output

voltage

Inductive loads

turn-off

<0 V

Table 12. MultiSense multiplexer addressing for a dual channel device

SEn

SEL1 SEL0 MUXchannel

MultiSense output

Normal mode

Overload

OFF-state diag.

Negative

output

Hi-Z

Channel 0

diagnostic

ISENSE = 1/K * IOUT0 VSENSE = VSENSEH

VSENSE = VSENSEH

Channel 1

diagnostic

ISENSE = 1/K * IOUT1 VSENSE = VSENSEH

VSENSE = VSENSEH

TCHIP sense

VSENSE = VSENSE_TC

VCC sense

VSENSE = VSENSE_VCC

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