TSS461F datasheet(49/57 Pages) ATMEL

49 / 57 page

7615A–AUTO–02/06

TSS461F

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 TSS461F.

Idle and Activate

Commands

After reset, the TSS461F 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

18) is in three-state mode, a pull-up resistor must be provided externally or by the line driver to

avoid floating state on the VAN bus.

To activate the TSS461F, the user must set the activate bit (ACTI) and reset the idle bit (IDLE).

Figure 30. Idle and Activate Timings

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

Sleep Command

If the user sets the sleep bit (SLEEP), the TSS461F enters in sleep mode, whatever are the val-

ues of activate and idle bits. All non-user registers are set-up to reduce the power consumption

and the internal oscillator is immediately stopped. However, all user registers (accessible by µP

bus) are always available by the user

To exit from this mode, the user must set either the idle bit or the activate bit.

In a typical application (Figure 12) using the CKOUT feature (pin 12), if the TSS461F 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

TSS461F Datasheet(PDF) 49 Page - ATMEL Corporation

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