L99DZ320 datasheet(61/146 Pages) STMICROELECTRONICS

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Figure 24. CAN wake-up capabilities

CAN pattern wake-up with dominant state before STANDBY

ACTIVE

STANDBY

t < tWAKE

ACTIVE

STANDBY

t > tfilter

tfilter

CAN pattern wake-up

t > tfilter

tfilter

t < tWAKE

CAN RX

STATE

CAN RX

STATE

GADG041120211203GT

Note:

The waveforms above illustrate the wake-up behavior from V1_Standby mode. For wake-up from

VBAT_Standby mode the NRESET signal (with 2 ms timing) is generated instead of the RXDL (interrupt) signal.

3.10.5

CAN receive only mode

During TRX normal mode, with the CAN_REC_ONLY bit it is possible to disable the CAN transmitter. In this mode

it is possible to listen to the bus but not sending to it. The receiver termination network is still activated in this

mode.

3.10.6

CAN looping mode

If the CAN_LOOP_EN (CR1) is set the TXDC input is mapped directly to the RXDC pin. This mode can be used

in combination with the CAN receive only mode, to run diagnosis for the CAN protocol handler of the

microcontroller.

3.11

Serial peripheral interface (ST SPI standard)

A 32-bit SPI is used for bidirectional communication with the microcontroller.

The SPI is driven by a microcontroller with its SPI peripheral running in the 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 built in SPI. Only three CMOS compatible output pins

and one input pin need 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.

•

Chip select not (CSN)

The input pin is used to select the serial interface of this device. When CSN is high, the output pin (DO) is

in high impedance state. A low signal activates the output driver and a serial communication can be

started. The state during CSN = 0 is called a communication frame.

If CSN = low for t > tCSNfail the DO output is switched to high impedance in order not to block the signal line

for other SPI nodes.

L99DZ320

Functional description

DS14235 - Rev 5

page 61/146

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