ATA6628 データシートの表示（PDF） - Atmel Corporation

部品番号

コンポーネント説明

メーカー

ATA6628

LIN Bus Transceiver with 3.3V (5V) Regulator and Watchdog

Atmel Corporation 

4.6 Unpowered Mode

If you connect battery voltage to the application circuit, the voltage at the VS pin increases according to the block capacitor

(see Figure 5-1 on page 18). After VS is higher than the VS undervoltage threshold VSth, the IC mode changes from

Unpowered Mode to Fail-safe Mode. The VCC output voltage reaches its nominal value after tVCC. This time, tVCC, depends

on the VCC capacitor and the load.

The NRES is low for the reset time delay treset. During this time, treset, no mode change is possible.

IF VS drops below VSth, then the IC switches to Unpowered Mode. The behavior of VCC, NRES and LIN is shown in Figure

4-8. The watchdog needs to be triggered.

Figure 4-8. VCC versus VS for the VCC = 3.3V Regulator

6

5.5

5

4.5

Regulator drop voltage VD

4

LIN

3.5

3

2.5

VS

2

NRES

1.5

1

VCC

0.5

0

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6

VS (V)

4.7 High-speed Mode

If SP_MODE pin is high and the IC is in Normal Mode, the slew rate control is switched off. The slope time of the LIN falling

edge is tS_Fall < 2µs. The slope time of the LIN rising edge strongly depends on the LIN capacitive and resistive load. To

achieve a high baud rate it is recommended to use a small resistor (500Ω) and a low capacitor. This allows very fast data

transmission up to 200kBaud, e.g., for electronic control (ECU) tests and microcontroller program or data download. In this

mode superior EMC performance is not guaranteed.

ATA6628/ATA6630 [DATASHEET]

15

9117I–AUTO–10/14

Share Link: