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| 型号： | ADM690AN |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR MPU 4.65 WD 8DIP |
| 标准包装： | 50 |
| 类型： | 备用电池电路 |
| 监视电压数目： | 1 |
| 输出： | 推挽式，图腾柱 |
| 复位： | 低有效 |
| 复位超时： | 最小为 35 ms |
| 电压 - 阀值： | 4.65V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-PDIP |
| 包装： | 管件 |
ADM690–ADM695
+APPLICATION INFORMATION
Increasing the Drive Current
If the continuous output current requirements at V OUT exceed
100 mA or if a lower V CC –V OUT voltage differential is desired,
When PFO is low, resistor R 3 s inks current from the summing
junction at the PFI pin. When PFO is high, the series combina-
tion of R 3 and R 4 source current into the PFI summing junc-
tion. This results in differing trip levels for the comparator.
an external PNP pass transistor may be connected in parallel
with the internal transistor. The BATT ON output (ADM691/
ADM693/ADM695) can directly drive the base of the external
transistor.
+7V TO +15V
INPUT
POWER
7805
+5V
V CC
R 4
PNP TRANSISTOR
R 1
1.3V
PFO
+5V
INPUT
POWER
0.1 μ F
0.1 μ F
PFI
TO
μ P NMI
R 2
ADM69x
BATTERY
V CC
V BATT
BATT
ON
ADM691
ADM693
V OUT
R 3
ADM695
5V
Figure 17. Increasing the Drive Current
Using a Rechargeable Battery for Back Up
PFO
If a capacitor or a rechargeable battery is used for back up then
the charging resistor should be connected to V OUT since this
eliminates the discharge path that would exist during power
0V
0V
V L
V IN
V H
+5V
0.1 μ F
R
R 1
(
)
V H = 1.3V 1+ –– 1 – + –––
(
V L = 1.3V 1+ ––– – –––––––––––––
down if the resistor is connected to V CC .
I = V OUT – V BATT
R
INPUT
POWER
0.1 μ F
R
R 2 R 3
R 1 R 1 (5V – 1.3V)
R 2 1.3V (R 3 + R 4 )
)
ASSUMING R 4 < < R 3 THEN
(
HYSTERESIS V H – V L = 5V ––– 1
V CC
V OUT
R
R 2
)
V BATT
Figure 19. Adding Hysteresis to the Power Fail Comparator
RECHARGEABLE
BATTERY
ADM69x
Monitoring the Status of the Battery
The power fail comparator can be used to monitor the status of
the backup battery instead of the power supply if desired. This
is shown in Figure 20. The PFI inpu t samples the battery volt-
age and generates an active low PFO signal when the battery
Figure 18. Rechargeable Battery
Adding Hysteresis to the Power Fail Comparator
For increased noise immunity, hysteresis may be added to the
power fail comparator. Since the comparator circuit is nonin-
verting, hysteresis can be added simply by connecting a resistor be-
tween the PFO output and the PFI input as shown in Figure 19.
voltage drops below a chosen threshold. It may be necessary to
apply a test load in order to determine the loaded battery volt-
age. This can be done under processor control using CE OUT.
Since CE OUT is forced high during the battery backup mode, the
test load will not be applied to the battery while it is in use, even
if the microprocessor is not powered.
–10 –
REV. A
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