L9300 datasheet(92/178 Pages) STMICROELECTRONICS

92 / 178 page

15.1.4

CAN receive-only mode

With a configuration bit in control register it is possible to disable the CAN transmitter in active mode. In this mode

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

mode. The same effect can be obtained driving high the CAN_DIS pin.

15.1.5

CAN looping mode

If the proper configuration bit in control register 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.

15.1.6

CAN disable

CAN transmitter can be disabled through a dedicated pin active high. In this mode it is possible to listen to the

bus, but not to send to it. The receiver termination network is still activated in this mode (same as CAN Receive-

only Mode).

Figure 61. CAN transition time

90 %

10 %

90 %

tTHSd

tTHSr

CAN_H

CAN_L

GADG0708171014PS

15.2

CAN electrical characteristics

5.5 V ≤ VBATP ≤ 19 V; 4.8 V ≤ CANVDD ≤ 5.2 V; -40 °C ≤ Tj ≤ 175 °C unless otherwise noticed. All voltages refer

to GND pin.

Table 53. CAN electrical characteristics

Symbol

Parameter

Test condition

Min

Typ

Max

Unit

Input Pin

VTXDCLOW

Input voltage dominant

threshold

Active mode

0.75

TXD

VTXDCHIGH

Input voltage recessive

threshold

Active mode

1.75

TXD

VTXDCHYS

VTXDCHIGH-

VTXDCLOW

Active mode

0.2

0.4

TXD

RTXDCPU

TXDC pull up resistor

Active Mode, Pull-up to internal

logic supply

µA

TXD

Vil(CAN_DIS)

Low Input Voltage

0.75

CAN_DIS

Vih(CAN_DIS)

High Input Voltage

1.75

CAN_DIS

Ipd(CAN_DIS)

CAN_DIS pull-down

CAN_DIS = 5V

100

µA

CAN_DIS

Output Buffer

VRXDCLOW

Output voltage dominant

level

Active mode, ILOAD = 1 mA

0.2

0.5

RXD

VRXDCHIGH

Output voltage recessive

level

Active mode, ILOAD = 1 mA

VDDIO -

0.5

VDDIO -

0.2

RXD

L9300

CAN Interface

DS12258 - Rev 5

page 92/178

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