ata6621n ATMEL Corporation, ata6621n Datasheet - Page 16
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ata6621n
Manufacturer Part Number
ata6621n
Description
Lin Transceiver With 5v Regulator And Watchdog
Manufacturer
ATMEL Corporation
Datasheet
1.ATA6621N.pdf
(28 pages)
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3.20
16
Temperature Monitor at Pin TEMP
ATA6621N
A microcontroller with an oscillator tolerance of ±15% is sufficient to supply the trigger inputs
correctly within the time period of t
Table 3-2.
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 V
cal negative temperature coefficient of V
20 µA current source is switched off.
Figure 3-10. Temperature Monitor
Rwd_osc
120
k
10
51
91
Oscillator
Table of Watchdog Timings
Period
t
osc
12.5
22.4
2.6
29
/µs
t
113.7
Lead
Time
10.2
49.4
87.8
d
/ms
wd
V
TEMP
Window
Closed
CC
= 14.2 ms (±15%) in an application with R
17.92
t
2.08
23.2
1
10
/ms
TC,TEMP
Open Window
= –5.05 mV/k. In silent and sleep mode the
t
18.82
24.36
2.18
10.5
2
/ms
20 µA
Trigger Period from
microcontroller
t
25.45
32.94
wd
2.90
14.2
/ms
temp
= 2.2V with a typi-
wd_osc
4887H–AUTO–12/07
Reset time
= 51 k .
t
nres
0.41
1.96
3.52
4.55
/ms