L99MM70XP datasheet(23/68 Pages) STMICROELECTRONICS

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L99MM70XP

Description

Doc ID 022637 Rev 2

23/68

Normal wake-up

Normal wake-up can occur when the L99MM70XP was set in standby mode while a

recessive (state was present on the bus. A dominant level at LIN for t > tlinbus, switches the

L99MM70XP to active mode. An interrupt is generated at the RXD/NINT pin.

Wake-up from short to GND condition

If the L99MM70XP was set in standby mode while LIN was in dominant (low) state,

recessive level at LIN for tlinbus, switches the L99MM70XP to active mode. An interrupt is

generated at the RXD/NINT pin.

3.13

Serial peripheral interface (ST SPI standard)

A 24 bit ST-SPI is used for bi-directional communication with the microcontroller.

During active mode, the SPI

●

Triggers the watchdog

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Controls the modes and status of all L99MM70XP modules (incl. input and output

drivers)

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Provides driver output diagnostic

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Provides L99MM70XP diagnostic (incl. overtemperature warning, L99MM70XP

operation status)

Note:

During standby modes, the SPI is generally deactivated.

The SPI can be driven by a microcontroller with its SPI peripheral running in following mode:

CPOL = 0 and CPHA = 0.

For this mode, input data is sampled by the low to high transition of the clock CLK, and

output data is changed from the high to low transition of CLK.

This device is not limited to microcontroller with a build-in SPI. Only three CMOS-compatible

output pins and one input pin are needed to communicate with the device. A fault condition

can be detected by setting CSN to low. If CSN = 0, the DO pin reflects the global error flag

(fault condition) of the device (see Figure 7). This operation does not cause the

communication error bit in the global status byte to be set.

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