L9924TR datasheet(28/85 Pages) STMICROELECTRONICS

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Electrical specifications

L9924

28/85

DocID029638 Rev 2

5.3.7

Pin "PH"

The PH pin is an input for the phase signal coming from alternator's stator output. The

internal comparator detects the presence of the phase signal when V(PH) > VPHTh. The

squared signal is forwarded to a period measurement unit that provides suitable timing data

to the µC to compute the rotor speed.

If the phase signal falls below the VPprTh1/VPprTh2 threshold the phase regulation request

(bit 12 of SPI register 0x13 is set [13.4.7]).

The device exits the stand-by mode when an activity is detected on PH pin (i.e.

V(PH)>VPHTh) independently on the status of other wake-up sources.

5.3.8

Pin "AUX_IN"

The AUX_IN pin can be used as auxiliary phase input signal in addition to PH pin. If not

used, AUX_IN pin must be tied to ground. It's forbidden to replace AUX_IN pin with PH pin.

Table 17. Electrical characteristics pin "PH"

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

1VPHTh

High voltage comparator

threshold

V(AUX_IN)=V(GND)

200

280

360

2VPLTh

Low voltage comparator threshold V(AUX_IN)=V(GND)

120

190

260

3tPSR

Spike rejection time

Analogue filter

μs

4IPpull-dw Pull-down current

V(PH) = 28 V

5RPpull-dw Passive pull-down resistance

kΩ

6VPprTh1

12-V phase regulation voltage

threshold

[0x2].12 = SEL24V_EN=b0

7VPprTh2

24-V phase regulation voltage

threshold

[0x2].12 = SEL24V_EN=b1

22.5

Table 18. Electrical characteristics pin "AUX_IN"

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

1VAUXHTh

High voltage comparator

threshold

V(PH) = 1.150 V

200

280

360

2VAUXLTh

Low voltage comparator

threshold

V(PH) = 1.150 V

120

190

260

3tAUXSR

Spike rejection time

Analogue filter

µs

4IAUXpull-dw Pull-down current

V(AUX_IN) = 28 V

µA

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