ATA6621N(2007) 데이터 시트보기 (PDF) - Atmel Corporation

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ATA6621N
(Rev.:2007)

LIN Transceiver with 5V Regulator and Watchdog

Atmel Corporation 

3.13

MODE Input Pin

For normal watchdog operation connect pin MODE via an external resistor to GND (see Figure

5-2 on page 24). For debugging your software you can connect pin MODE to 5V and the watch-

dog is switched off.

3.14

TM Input Pin

Pin TM is used in final production measurement at Atmel®. In the application it is always con-

nected to GND.

3.15 Modes of Operation

Figure 3-1. Modes of Operation

Unpowered Mode

VBatt = 0

b

a

a: VS > 5V

b: VS < 4V

c: Bus wake-up event

d: NRES switches to low

e: Wake-up from wake-up switch

Pre-normal Mode

VCC: 5V/50 mA with undervoltage

b

monitoring

Communication: OFF

d

b

c+d+e

EN = 1

Normal Mode

VCC: 5V ±2%/50 mA

with undervoltage

monitoring

Communication: ON

EN = 0

TXD = 1

EN = 1

EN = 0

TXD = 0

EN = 1

Go to silent command

Local wake-up event

Go to sleep command

Local wake-up event

c+e

b

Silent Mode

VCC: 5V ±7%/50 mA

with undervoltage monitoring

Communication: OFF

Sleep Mode

VCC: switched off

Communication: OFF

3.15.1

Normal Mode

This is the normal transmitting and receiving mode. The voltage regulator is in normal mode and

can source 50 mA. The undervoltage detection is activated. The watchdog needs a trigger signal

from PTRIG or NTRIG to avoid resets at NRES.

3.15.2

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 (Figure 3-2 on page 7). For EN and TXD either two

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

ond case, the mode change is only one command. In Silent mode, the transmission path is

disabled. Supply current from VBat is typically IVSsi = 40 µA with no load at the VCC regulator.

6 ATA6621N

4887H–AUTO–12/07

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