L9924TR datasheet(80/85 Pages) STMICROELECTRONICS

Part #	L9924TR

Description	Automotive vehicle conform truck car alternator regulator IC

PDF	85 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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80 / 85 page

SPI interface

L9924

80/85

DocID029638 Rev 2

Read phase register (0x13)

4C0000 025138

GSW: Key active

DATA: as before

Phase notification is no longer present because of

previous read operation. Data are not significant

Wait 22 ms (4 phase periods

plus a 2 ms margin)

Write 0x10 to unlock register

(0x01): unlock SW reset bit

840010 02C000

GSW:

– Key active

– Phase notification (new data available)

Write 0x10 to system

operation register (0x02): SW

reset cmd

880010 02C000

GSW:

– Key active

– Phase notification (new data available – reg

0x13 not read)

Remove L key

Write 1 to unlock register

(0x01): unlock stand by bit

840001 04C000

GSW:

– CP-LOW (because of prev SW reset)

– Phase notification (new data available – reg

0x13 not read)

Key flag no longer present

Write 1 to system operation

by bit

880001 04C000 See above

Table 62. SPI sequence examples (continued)

Operation

MOSI

MISO

Comment

L9924TR Datasheet(PDF) 80 Page - STMicroelectronics

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