L99H02 datasheet(35/51 Pages) STMICROELECTRONICS

Teilenummer	L99H02

Bauteilbeschribung	H-bridge gate driver for automotive applications

PDF	51 Pages

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Hersteller	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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35 / 51 page

DS12547 Rev 6

35/51

L99H02

Functional description of the SPI

4.4.1

SPI clock monitor and watchdog

Figure 11. Global error flag diagram

Note:

Writing a “1” to RWD - bit in ApplRegx restarts the internal watchdog counter.

The clock monitor counts the number of clock pulses during a communication frame (while

CSN is low). If the number of SCK pulses does not correspond with the frame width

indicated in the <SPI-frame-ID> (ROM address 03hex) the frame is ignored and the bit

in the <Global Status Byte> is set.

Note:

Due to this safety functionality, daisy chaining the SPI is not possible. Instead, a parallel

operation of the SPI bus by controlling the CSN signal of the connected ICs is

recommended.

SCK

SDI

SDO / Err

CSN

Communication Error

WD counter

Watchdog Failure

Global Status Byte

Global Error Flag

Clock-

Monitor

RWD

ApplRegx

bit 7

GAPGCFT00670

L99H02 Datenblatt(PDF) 35 Page - STMicroelectronics