TSS463B datasheet(51/59 Pages) ATMEL

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TSS463B

4102E–AUTO–12/04

Activate, Idle and

Sleep Modes

Sleep, idle and activate commands are located in the Command Register (0x03). These

three commands are general commands for the TSS463B.

Idle and Activate

Commands

After reset, the TSS463B starts in idle mode. In this mode, the oscillator operates

(CKOUT pin active) but the circuit cannot transmit or receive anything on the VAN bus.

The TxD output (pin 12) is in tri-state mode, a pull-up resistor must be provided exter-

nally or by the line driver to avoid floating state on the VAN bus. To activate the

TSS463B, the user must set the activate bit (ACTI) and reset the idle bit (IDLE).

Figure 35. Idle and Activate Timings

In both cases, the idle state can be verified reading the Line Status register (0x04).

Sleep Command

If the user sets the sleep bit (SLEEP), the TSS463B enters in sleep mode, regardless of

the values of activate and idle bits. It means that, all non-user registers are set-up to

reduce the power consumption and the internal oscillator is immediately stopped. Then,

accesses to all registers (and to the messages) via the SPI/SCI interface are impossible

and CKOUT is not provided.

To exit from this mode the user must apply either an hardware reset (external reset pin)

either an asynchronous software reset (via the SPI/SCI interface).

In a typical application (see Figure 5), using the CKOUT feature (pin 8), if the TSS463B

is put in sleep mode, the clock provided to the microcontroller is stopped. So, the system

does not run and the only way to awake this application is an external reset.

(max)

RxD

TxD

After Reset

Idle Mode

Activate Mode

Activate command

3 TS

8 TS

12 TS

TS: Timeslot Period

SOF

Idle Command

FCS

5 TS

4 TS

RxD

INT

Idle Mode

Activate Mode

TSS463B Datasheet(PDF) 51 Page - ATMEL Corporation

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