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L9912 Datasheet(PDF) 19 Page - STMicroelectronics

Part # L9912
Description  Automotive vehicle conform car alternator regulator IC
PDF  84 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9912 Datasheet(HTML) 19 Page - STMicroelectronics

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DocID029639 Rev 2
19/84
L9912
Electrical specifications
83
A similar block is used to bring A+ pin voltage to AIN5 microcontroller analog input.
5.3.3
Pin “IGNIT”
The IGNIT pin is an input used as additional signal to wake-up the device. The signal
applied to IGNIT is compared to a threshold VIGNITdetx to manage the device wake-up. If
not used this pin must be tied to GND.
5.3.4
Pin “PROT_SEL”
This pin is used together with RC to select the used protocol.The pull-up resistor present in
Active mode is turned into pull-down one in power stand-by mode to limit current consump-
tion.
Table 10. Electrical characteristics pin "SENSE"
#
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
1
αS
Resistor divider attenuation
[0x2].12 = SEL24V_EN = 0
3.96
4
4.04
V/V
[0x2].12 = SEL24V_EN = 1
7.925
8
8.069
V/V
2
εS
Resistor divider accuracy
[0x2].12 = SEL24V_EN = 1
-
-
0.9
%
3fSp
Pole frequency
-
520
860
1570
Hz
Table 11. Electrical characteristics pin “IGNIT”
#
Symbol
Parameter
Test condition
Min.
Typ.
Max.
Unit
1VIGNITdet1
24-V threshold input voltage [0x2].12 = SEL24V_EN = b1
11
13
15
V
2VIGNITdet2 12-V threshold input voltage [0x2].12 = SEL24V_EN = b0
6
8
10
V
3
IGNITpull-dw Pull-down current
28 V<(IGNIT) ≤ VIGNITdet2
-
20
250
µA
Table 12. Electrical characteristics pin “PROT_SEL”
#
Symbol
Parameter
Test condition
Min.
Typ.
Max.
Unit
1
VPSELL Low level input voltage
-
-
-
1.3
V
2
VPSELH High level input voltage
-
2.3
-
VDD
V
3
VPSELHyst Input hysteresis
-
-
0.4
-
V
4
RPSEL
Pull-up/pull-down resistor
Active mode
Pull-up to internal 3.3-V power rail
V(PROT_SEL) = V(GND)
RPSEL = -3.3 V/I(PROT_SEL)
-100
-
kΩ



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