TLE9263QX datasheet(65/164 Pages) INFINEON

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Data Sheet

Rev. 1.1, 2014-09-26

TLE9263QX

High Speed CAN Transceiver

10.2.1

CAN OFF Mode

The CAN OFF Mode is the default mode after power-up of the SBC. It is available in all SBC Modes and is intended

to completely stop CAN activities or when CAN communication is not needed. The CANH/L bus interface acts as

a high impedance input with a very small leakage current. In CAN OFF Mode, a wake-up event on the bus will be

ignored.

10.2.2

CAN Normal Mode

The CAN Transceiver is enabled via SPI in SBC Normal Mode. CAN Normal Mode is designed for normal data

transmission/reception within the HS-CAN network. The Mode is available in SBC Normal Mode and in SBC Stop

Mode. The bus biasing is set to VCAN/2.

Transmission

The signal from the microcontroller is applied to the TXDCAN input of the SBC. The bus driver switches the

CANH/L output stages to transfer this input signal to the CAN bus lines.

Enabling sequence

The CAN transceiver requires an enabling time tCAN,EN before a message can be sent on the bus. This means that

the TXDCAN signal can only be pulled LOW after the enabling time. If this is not ensured, then the TXDCAN needs

to be set back to HIGH (=recessive) until the enabling time is completed.

Only the next dominant bit will be transmitted on the bus.

Figure 28 shows different scenarios and explanations for CAN enabling.

Figure 28

CAN Transceiver Enabling Sequence

Reduced Electromagnetic Emission

To reduce electromagnetic emissions (EME), the bus driver controls CANH/L slopes symmetrically.

Reception

Analog CAN bus signals are converted into digital signals at RXD via the differential input receiver.

CANDIFF

CAN,EN

TXDCAN

CAN

Mode

CAN

NORMAL

CAN

OFF

CAN,EN

recessive TXD level

required bevor start of

transmission

tCAN, EN not ensured , no

transmission on bus

CAN,EN

Correct sequence ,

Bus is enabled after t

CAN, EN

tCAN, EN not ensured ,

no transmission on bus

recessive TXD

level required

Dominant

Recessive

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