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

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ATA6621N-PGPW
(Rev.:2007)

LIN Transceiver with 5V Regulator and Watchdog

Atmel Corporation 

A microcontroller with an oscillator tolerance of ±15% is sufficient to supply the trigger inputs

correctly within the time period of twd = 14.2 ms (±15%) in an application with Rwd_osc = 51 kΩ.

Table 3-2.

Rwd_osc

kΩ

10

51

91

120

Table of Watchdog Timings

Oscillator

Period

tosc/µs

2.6

Lead

Time

td/ms

10.2

Closed

Window

t1/ms

2.08

12.5

49.4

10

22.4

87.8

17.92

29

113.7

23.2

Open Window

t2/ms

2.18

10.5

18.82

24.36

Trigger Period from

microcontroller

twd/ms

2.90

Reset time

tnres/ms

0.41

14.2

1.96

25.45

3.52

32.94

4.55

3.20

Temperature Monitor at Pin TEMP

In addition to the internal temperature monitoring of the voltage regulator, an additional sensor

measures the junction temperature and provides a linearized voltage at the TEMP pin. Together

with the analog functions of the microcontroller (for example, the analog comparator and the

Analog-to-digital converter (ADC)), this enables the application to detect overload conditions

and to take corresponding measures in order to prevent damage. An external capacitor buffers

the voltage due to the input current of the ADC.

The sensor itself is built out of three diodes which are supplied by an internal BIAS current in

Pre-normal mode and Normal mode. The typical voltage at T = 27°C is Vtemp = 2.2V with a typi-

cal negative temperature coefficient of VTC,TEMP = –5.05 mV/k. In silent and sleep mode the

20 µA current source is switched off.

Figure 3-10. Temperature Monitor

VCC

TEMP

20 µA

16 ATA6621N

4887H–AUTO–12/07

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