ATA6620N 데이터 시트보기 (PDF) - Atmel Corporation

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ATA6620N

LIN Bus Transceiver with Integrated Voltage Regulator

Atmel Corporation 

4.2 Modes of Reduced Current Consumption

4.2.1

Silent Mode

A falling edge at EN while TXD is high switches the IC into Silent mode. The TXD Signal has to

be logic high during the Mode Select window (see Figure 4-2 on page 6). For EN and TXD either

two independent outputs can be used, or two outputs from the same microcontroller port; in the

second case, the mode change is only one command.

In Silent mode the transmission path is disabled. Supply current from VBatt is typically

IVSsi = 40 µA with no load at the VCC regulator.

The overall supply current from VBatt is the result of 40 µA plus the VCC regulator output current

IVCCs.

The 5V regulator is in low tolerance mode (4.65V to 5.35V) and can source up to 50 mA. In

Silent mode the internal slave termination between pin LIN and pin VS is disabled to minimize

the power dissipation in case pin LIN is short-circuited to GND. Only a weak pull-up current (typ-

ically 10 µA) between pin LIN and pin VS is present.

The Silent mode voltage is sufficient to run an external microcontroller on the ECU, for example

in Power Down mode. The undervoltage reset is VCCthS < 4.4V. If an undervoltage condition

occurs, NRES is switched to low and the ATA6620N changes state to Pre-normal mode.

A falling edge at pin LIN followed by a dominant bus level maintained for a certain time period

(tbus) results in a remote wake-up request. The device switches from Silent mode to Pre-normal

mode, then the internal LIN slave termination resistor is switched on. The remote wake-up

request is indicated by a low level at pin RXD to interrupt the microcontroller and a high level at

pin TXD (see Figure 4-3 on page 7).

With EN high, ATA6620N switches directly from Silent- via Pre-normal to Normal mode.

Figure 4-2. Switch to Silent Mode

Normal Mode

Silent Mode

EN

TXD

NRES

VCC

td = 3.2 µs

Mode select window

LIN

6 ATA6620N

Delay time silent mode

td_sleep = maximum 20 µs

LIN switches directly to recessive mode

4850I–AUTO–09/09

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