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| 型号： | ADM691AARU-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR MPU 4.65V 16TSSOP |
| 标准包装： | 2,500 |
| 类型： | 备用电池电路 |
| 监视电压数目： | 1 |
| 输出： | 开路漏极，推挽式 |
| 复位： | 高有效/低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 4.65V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 16-TSSOP |
| 包装： | 带卷 (TR) |
ADM691A/ADM693A/ADM800L/M
Changing the Watchdog and Reset Timeout
The watchdog and reset timeout periods may be controlled us-
ing OSC SEL and OSC IN. Please refer to Table II. With both
these inputs floating (or connected to V OUT ) as in Figure 16, the
reset timeout is fixed at 200 ms and the watchdog timeout is
fixed at 1.6 sec.. If OSC IN is connected to GND as in Figure
16, the reset timeout period remains at 200 ms but a short
When V CC is below the reset threshold, the watchdog function is
disabled and WDI goes high impedance as it is disconnected
from its internal resistor network.
The internal oscillator is enabled when OSC SEL is high or
floating. In this mode, OSC IN selects between the 1.6 second
and 100 ms watchdog timeout periods.
(100 ms) watchdog timeout period is selected (except immedi-
ately following a reset where it reverts to 1.6 sec). By connecting
OSC SEL to GND it is possible to select alternative timeout pe-
V CC
RESET
THRESHOLD
80μs
t RS
80μs
OSC SEL
t RS
riods by either connecting a capacitor from OSC IN to GND or
by overdriving OSC IN with an external clock. With an external
capacitor, the watchdog timeout period is
Twd ( ms ) = 600 ( C /47 pF )
and the reset active period is
Treset ( ms ) = 1200 (C/47 pF )
With an external clock connected to OSC IN, the timeout
periods become
Twd = 1024 (1/ f CLK )
Treset = 2048 (1/ f CLK )
Battery-Switchover Section
RESET
RESET
CE IN
CE OUT
12μs
Figure 17. RESET and Chip Enable Timing
During normal operation with V CC higher than the reset thresh-
old and higher than V BATT , V CC is internally switched to V OUT
via an internal PMOS transistor switch. This switch has a typi-
cal on-resistance of 0.75 ? and can supply up to 250 mA at the
8
OSC SEL
ADM69_A
ADM800_
V OUT terminal. V OUT is normally used to drive a RAM memory
bank which may require instantaneous currents of greater than
CLOCK
0 TO 250kHz
7
OSC IN
250 mA. If this is the case then a bypass capacitor should be
connected to V OUT . The capacitor will provide the peak current
transients to the RAM. A capacitance value of 0.1 μ F or greater
may be used.
Figure 18a. External Clock Source
If the continuous output current requirement at V OUT exceeds
NC
8
OSC SEL
250 mA or if a lower V CC –V OUT voltage differential is desired,
an external PNP pass transistor may be connected in parallel
with the internal transistor. The BATT ON output can drive
the base of the external transistor.
NC
7
OSC IN
ADM69_A
ADM800_
If V CC drops below V BATT and below the reset threshold, battery
backup is selected. A 7 ? MOSFET switch connects the V BATT
input to V OUT . This MOSFET has very low input-to-output
Figure 18b. Internal Oscillator (1.6 s Watchdog)
differential (dropout voltage) at the low current levels required for
battery backup of CMOS RAM or other low power CMOS cir-
cuitry. The supply current in battery backup is typically 0.04 μ A.
High value capacitors, either standard electrolytic or the farad-
size double layer capacitors, can also be used for short-term
memory backup.
If the battery-switchover section is not used, V BATT should be
C OSC
8
7
OSC SEL
OSC IN
ADM69_A
ADM800_
connected to GND and V OUT should be connected to V CC .
Figure 18c. External Capacitor
Table II. Reset Pulse Width and Watchdog Timeout Selections
Watchdog Timeout Period
OSC SEL
OSC IN
Normal Immediately After Reset
Reset Active Period
Low
Low
Floating
Floating
External Clock Input
External Capacitor
Low
Floating or V OUT
1024 clks
600 ms × C/47 pF
100 ms
1.6 s
4096 clks
2.4 s × C/47 pF
1.6 s
1.6 s
2048 clks
1200 ms × C/47 pF
200 ms
200 ms
–8 –
REV. 0
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| ADM691AARUZ | 功能描述:IC SUPERVISOR MPU 4.65V 16TSSOP 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 |
| ADM691AARW | 功能描述:IC SUPER MPU 4.65 250MA 16SOIC 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 |
| ADM691AARW-REEL | 功能描述:IC SUPERVISOR MPU 4.65V 16SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:3,000 系列:- 类型:简单复位/加电复位 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 140 ms 电压 - 阀值:3.08V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:TO-236-3，SC-59，SOT-23-3 供应商设备封装:SOT-23-3 包装:带卷 (TR) |
| ADM691AARWZ | 功能描述:IC SUPER MPU 4.65 250MA 16SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 其它有关文件:STM6905 View All Specifications 标准包装:1 系列:- 类型:多压监控器 监视电压数目:5 输出:开路漏极或开路集电极 复位:低有效 复位超时:最小为 140 ms 电压 - 阀值:2.188V，2.955V，可调，可调，可调 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-TSSOP 包装:Digi-Reel® 产品目录页面:1197 (CN2011-ZH PDF) 其它名称:497-8728-6 |
| ADM691AARWZ-REEL | 功能描述:IC SUPERVISOR MPU 4.65V 16SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:3,000 系列:- 类型:简单复位/加电复位 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 140 ms 电压 - 阀值:3.08V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:TO-236-3，SC-59，SOT-23-3 供应商设备封装:SOT-23-3 包装:带卷 (TR) |
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