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参数资料
| 型号： | ADM8690ANZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 15/24页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR MPU 4.65V 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 |
Data Sheet
APPLICATIONS INFORMATION
ADM8690/ADM8691/ADM8695
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,
an external PNP pass transistor can be connected in parallel
7V TO 15V
INPUT
POWER
R1
R2
7805
5V
PFI
1.3V
V CC
R3
PFO
R4
TO
MICROPROCESSOR
NMI
5V INPUT
PNP TRANSISTOR
( )
(
V L = 1.3V 1+
R2
R3 (1.3V (R3 + R4))
( R2 )
POWER
BATTERY
0.1μF
V CC
V BATT
BATT
ON
ADM8691/
ADM8695
V OUT
0.1μF
5V
PFO
0V
0V
V L
V IN
V H
R1 R1
V H = 1.3V 1+ R2 + R3
R1 R1 (5V – 1.3V)
–
ASSUMING R4 < < R3 THEN
HYSTERESIS V H – V L = 5V
R1
)
Figure 24. Increasing the Drive Current
USING A RECHARGEABLE BATTERY FOR BACKUP
If a capacitor or a rechargeable battery is used for backup, the
charging resistor should be connected to V OUT to eliminate the
discharge path that would exist during power-down if the
resistor were connected to V CC .
Figure 26. Adding Hysteresis to the Power-Fail Comparator
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
(see Figure 27). The PFI input samples the battery voltage and
generates an active low PFO signal when the battery voltage
5V INPUT
POWER
0.1μF
I=
V OUT – V BATT
R
R
0.1μF
drops below a selected threshold. It may be necessary to apply
a test load to determine the loaded battery voltage. This is done
under processor control using CE OUT . Because CE OUT is forced
V CC
V OUT
high during the battery backup mode, the test load is not applied
to the battery while it is in use, even if the microprocessor is not
RECHARGEABLE
BATTERY
V BATT
powered.
5V INPUT
POWER
Figure 25. Rechargeable Battery
ADDING HYSTERESIS TO THE POWER-FAIL
COMPARATOR
For increased noise immunity, hysteresis can be added to
the power-fail comparator. Because the comparator circuit is
noninverting, hysteresis can be added simply by connecting a
resistor between the PFO output and the PFI input, as shown in
BATTERY
20k ?
OPTIONAL
TEST LOAD
R1
R2
10M ?
10M ?
V BATT
PFI
CE OUT
V CC
PFO
CE IN
LOW BATTERY
SIGNAL TO
MICROPROCESSOR
I/O PIN
FROM
MICROPROCESSOR
I/O PIN APPLIES
TEST LOAD
TO BATTERY
summing junction at the PFI pin. When PFO is high, the series
combination of R3 and R4 sources current into the PFI summing
junction. This results in differing trip levels for the comparator.
Rev. C | Page 15 of 24
Figure 27. Monitoring the Battery Status
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADM8690ARN | 功能描述:IC SUPERVISOR MPU 4.65V 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:1 系列:- 类型:简单复位/加电复位 监视电压数目:1 输出:开路漏极或开路集电极 复位:高有效 复位超时:- 电压 - 阀值:1.8V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:6-TSOP（0.059"，1.50mm 宽）5 引线 供应商设备封装:5-TSOP 包装:剪切带 (CT) 其它名称:NCP301HSN18T1GOSCT |
| ADM8690ARN-REEL | 功能描述:IC SUPERVISOR MPU 4.65V 8SOIC TR RoHS:否 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:1 系列:- 类型:简单复位/加电复位 监视电压数目:1 输出:开路漏极或开路集电极 复位:高有效 复位超时:- 电压 - 阀值:1.8V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:6-TSOP（0.059"，1.50mm 宽）5 引线 供应商设备封装:5-TSOP 包装:剪切带 (CT) 其它名称:NCP301HSN18T1GOSCT |
| ADM8690ARNZ | 功能描述:IC SUPERVISOR MPU 4.65V 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 其它有关文件:STM6717 View All Specifications 标准包装:1 系列:- 类型:多压监控器 监视电压数目:2 输出:开路漏极或开路集电极 复位:低有效 复位超时:最小为 600 ms 电压 - 阀值:1.11V，3.075V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:Digi-Reel® 产品目录页面:1194 (CN2011-ZH PDF) 其它名称:497-7019-6 |
| ADM8691 | 制造商:AD 制造商全称:Analog Devices 功能描述:Microprocessor Supervisory Circuits |
| ADM8691AN | 制造商:Analog Devices 功能描述:Processor Supervisor 4.65V 4.75V to 5.5V 16-Pin PDIP 制造商:Rochester Electronics LLC 功能描述:IMPROVED ADM691 I.C. - Bulk 制造商:Analog Devices 功能描述:IC SUPERVISORY CCT 8691 DIP16 |
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