ATA6602 Ver la hoja de datos (PDF) - Atmel Corporation

Número de pieza

componentes Descripción

Fabricante

ATA6602

Microcontroller with LIN Transceiver, 5V Regulator and Watchdog

Atmel Corporation 

• The WD_OSC pin is a constant voltage regulator which supplies 2.5V for the external resistor

ROSC to adjust the watchdog timing. This output is short circuit protected. A short circuit to

GND causes a reset a pin NRES after typically 4 ms. An open circuit causes a reset at pin

NRES after typically 7 ms.

3.3.16

Voltage Regulator

The voltage regulator needs an external capacitor for compensation and to smooth the distur-

bances from the microcontroller. It is recommend to use an tantalum capacitor with C > 1.8 µF

and a caramic capacitor with C = 100 nF. The values of these capacitors can be varied by the

customer, depending on the application.

During mode change from Silent to Normal Mode, the voltage regulator ramps up to 6V for only

a few microseconds before it drops back to 5V. This behavior depends on the value of the load

capacitor. With 4.7 µF, the overshoot voltage has its greatest value. This voltage decreases with

higher or lower load capacitors.

The main power dissipation of the IC is created from the VDD output current IVDD, which is

needed for the application.

In Figure 3-8 on page 15 you see the safe operating range of the LIN-SBC.

Figure 3-7. VDD Voltage Regulator: Ramp Up and Undervoltage

VS

12V

5.5V

3V

VDD

5V

Vthun

NRES

5V

tvcc

tres

t

tres_f

t

t

14 ATA6602/ATA6603

4921C–AUTO–01/07

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