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參數(shù)資料
| 型號： | 935269142518 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8 |
| 封裝： | 3.90 MM, PLASTIC, MS-012, SOT-96, SO-8 |
| 文件頁數(shù)： | 3/18頁 |
| 文件大?。?/td> | 220K |
| 代理商： | 935269142518 |
Philips Semiconductors
Product data
NE56604-42
System reset with built-in watchdog timer
2001 Aug 22
11
Application information
The watchdog timer’s external component values are critical to its
performance.
The detection threshold voltage can be adjusted by externally
influencing the internal divider reference voltage. Figures 21 and 23
show a method to lower and raise the threshold voltage. Figures 22
and 24 show the influence of the pull-down and pull-up resistors on
the threshold voltage. The use of a capacitor (1000 pF or larger)
from Pin 7 to ground is recommended to filter out noise from being
imposed on the threshold voltages.
The Reset Detection Threshold can be decreased by connecting an
external resistor R1 from Pin 7 to VCC, as shown in Figure 21. See
Figure 22 to determine the approximate value of R1 to use.
The Reset Detection Threshold can be increased by connecting an
external resistor R2 from Pin 7 to ground, as shown in Figure 23.
See Figure 24 to determine the approximate value of R2 to use.
SL01327
1
2
3
4
8
7
6
5
RESET
CLK
GND
LOGIC SYSTEM
1000 pF
NE56604-42
VCC
CT
R1
Figure 21. Circuit to lower detection threshold.
SL01326
5.0
4.0
3.5
3.0
0
100
200
300
400
500
600
700
R1, EXTERNAL PIN 7 TO VCC RESISTOR (k)
Vs,
RESET
DETECTION
THRESHOLD
(V)
VCC = 5.0 V
Tamb = 25 °C
VSH
VSL
Figure 22. Reset detection threshold vs. external R1.
SL01328
1
2
3
4
8
7
6
5
RESET
CLK
GND
LOGIC SYSTEM
1000 pF
NE56604-42
VCC
CT
R2
Figure 23. Circuit to raise detection threshold.
SL01325
5.1
5.0
4.9
4.8
4.7
4.6
4.5
4.4
4.3
VCC = 5.0 V
Tamb = 25 °C
0
100
200
300
400
500
600
700
R2, EXTERNAL PIN 7 TO GROUND RESISTOR (k)
Vs,
RESET
DETECTION
THRESHOLD
(V)
VSH
VSL
Figure 24. Reset detection threshold vs. external R2.
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