ATA6621 ATMEL Corporation, ATA6621 Datasheet - Page 15

• Manufacturer Part Number: ATA6621
• Manufacturer: ATMEL Corporation

3.17
4887B–AUTO–01/06
Temperature Monitor at Pin TEMP
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
negative temperature coefficient of V
Figure 3-9.
Rwd_osc
120
k
10
51
91
Oscillator
Table of Watchdog Timings
Temperature Monitor
Period
t
osc
12.5
22.4
2.6
29
/µs
t
113.7
Lead
Time
10.2
49.4
87.8
d
/ms
V
TEMP
Window
Closed
CC
TC,TEMP
t
17.92
2.08
23.2
1
10
/ms
= –5.4 mV/k.
Open Window
18.82
24.36
t
2.18
10.5
2
/ms
20 µA
Trigger Period from
microcontroller
t
temp
25.45
32.94
wd
2.90
14.2
/ms
= 2.2V with a typical
ATA6621
Reset time
t
nres
0.41
1.96
3.52
4.55
/ms
15