L9788 datasheet(147/264 Pages) STMICROELECTRONICS

147 / 264 page

DS12308 Rev 4

147/264

L9788

CAN FD interface

263

If VDD_CAN is above VDD_CAN_SUP_OV for a tcansuphigh filter time an overvoltage fault

on VDD_CAN is detected. The fault is latched in a dedicated MSC flag VDD_CAN_OV until

an MSC Upstream Read14 is given during the MSC flag VDD_CAN_OV stays set the CAN

transmitter is disabled

During a VDD_CAN overvoltage or undervoltage detected fault the biasing voltage is

switched from VDD_CAN to a pre-regulated internal voltage (2.5V) supplied by VB_STBY.

When the fault ends the biasing voltage switches again on VDD_CAN. The msc flag

VDD_CAN_OV or CAN_SUP_LOW remains latched until an MSC Upstream Read14 is

given.

The biasing voltage is switched from VDD_CAN to a pre-regulated internal voltage (2.5V)

supplied by VB_STBY also in CAN_BIAS_ON and CAN_BIAS_OFF.

VB_CAN is the signal that enables CAN cell; if this pin is connected to VB_STBY the CAN is

enabled while if it's connected to GND the CAN is disabled

12.1

Functional description

General requirements:



Compliant with C&S CAN FD certification(ISO16845-2:2015);



Communication Speed up to 2 Mbit/s. (up to 5Mbit/s in "programming" mode);



Function range from -27 V to +40 V DC at CAN Pins;



GND disconnection fail safe at module level;



GND shift operation at system level;



Microcontroller interface with CMOS compatible I/O Pins;



Matched output slopes and propagation delay;



Receive-only mode available.

In order to further reduce the current consumption in low-power mode, the integrated CAN

bus interface offers an ultra low current consumption state when the u-chip is off called

Sleep mode.

L9788 Datasheet(PDF) 147 Page - STMicroelectronics