L9788TR datasheet(29/264 Pages) STMICROELECTRONICS

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DS12308 Rev 4

29/264

L9788

Operation behavior

263

3.1.3

Power up from KEY_IN

The chip is powered up if KEY_IN signal stays asserted for Key_Tfilter.There is a MSC bit

(KEY_IN_PIN_FLT in read command 15 frame 2) to indicate the status of KEY_IN pin signal

after filter time.

3.1.4

Power down from KEY_IN when PHOLD = 0

The chip is powered down if KEY_IN signal stays de-asserted for Key_Tfilter if no other

power up source is active.

Condition:

4.8 ≤ VB_IN ≤ 18 V, Tj -40 to 175 °C unless otherwise specified.

active

not permanent

MRD on by CAN

active

permanent

off

MRD used as normal low-side driver (is

controlled by MSC)

Table 8. Power up sources and actions summary (continued)

KEY_IN

WK_IN

EOT

CAN_FD

VB_IN

MRD

Actions

Table 9. Key pins electrical characteristics

Symbol

Parameter

Test condition

Min

Typ

Max

Unit

VIH

Logic input high

voltage threshold

3.6

4.1

KEY_IN

VIL1

Logic input low

voltage threshold

Main logic in POR

not released

3.1

3.6

KEY_IN

VIL2

Logic input low

voltage threshold

Main logic POR

released

1.7

2.3

KEY_IN

VIHYS

Logic input

hysteresis

0.1

0.8

KEY_IN

Key_Tfilter

Filter time for

switching on/off

Guaranteed by

test scan(1)

7.5

KEY_IN

Iinput

Input current of

KEY_IN

KEY_IN ≤ 5 V

340

µA

KEY_IN

RPD

Pull-down resistor KEY_IN = 1 V

170

300

500

kΩ

KEY_IN

1. Filter time for switching on, is active until KEY logic is out of POR, Filter time for switching off, is active until main logic out

of POR.

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