L99H01 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

L99H01

Motor bridge driver for automotive applications(LQFP32)

STMicroelectronics 

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Functional description of the SPI

4.4.1

SPI clock monitor and watchdog

Figure 11. Global error flag diagram

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L99H01

Note:

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1. 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

<frame error> in the <Global Status Byte> is set.

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.

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DocID15567 Rev 5

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