L9924L datasheet(35/84 Pages) STMICROELECTRONICS

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L9924L

Electrical specifications

Figure 16. Fault indicator lamp drive in alarm condition and key engaged

Table 22. Electrical characteristics pin "L"

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

1VLsat

Lamp driver

saturation

voltage

Lamp drive mode

I(L) = 0.3 A (1)

0.5

2VLRVC,fault

RVC protocol

alarm voltage

RVC drive mode

I(L) = 10 mA (1)

1.0

3VLKey_chk

Lamp driver

threshold

voltage to check

key presence

Lamp drive mode

I(L) = 250 mA

-1.0

4ILpulldw,weak

Weak pull-down

current

Reg(0x09.4) = b0

Reg(0x09.7) = b1

I(L)<0 @ V(L) = 0.7 V

ILpulldw,weak = -ILpullup + I(L)

-50

μA

5ILpulldw

Pull-down

current (total)

Reg(0x09.4) = b0

Reg(0x09.7) = b0

I(L)>0 @ V(L) = 0.7 V

ILpulldw=ILpulldw,weak + ILpulldw,strong=

=-ILpullup + I(L)

-1

6ILpullup(1)

Pull-up current

Active mode

Reg(0x09.5) = b0

ILpullup = I(L)<0 @ V(L) = V(GND)

Current from HS driver injected into L pin

--150

μA

7tchk,to

Key presence

check time-out

window

Lamp drive mode

digital window time-out

8tchk

Key presence

check time

window

Key switch engaged

Analogue time

I(L) = +250 mA

-45

μs

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