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参数资料
| 型号： | ADM694SQ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 13/16页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR MPU 4.65V 8CDIP |
| 标准包装： | 48 |
| 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 140 ms |
| 电压 - 阀值： | 4.65V |
| 工作温度： | -55°C ~ 125°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 8-CDIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-CERDIP |
| 包装： | 管件 |
ADM690–ADM695
INPUT POWER
+5V
RAM Write Protection
The ADM691/ADM693/ADM695 CE OUT line drives the Chip
0.1 μ F
0.1 μ F
Select inputs of the CMOS RAM. CE OUT follows CE IN as long
as V CC is above the 4.65 V (4.4 V for ADM693) reset threshold.
V CC V OUT
V BATT
CE OUT
CE IN
ADM695
PFO
RESET
μ P
R 1
R 2
3V
BATTERY
NC
BATT
ON
ADM691
ADM693
PFI
GND
OSC IN
OSC SEL
LOW LINE WDO
WDI
RESET
CMOS
RAM
ADDRESS
DECODE
0.1 μ F
A0–A15
I/O LINE
NMI
RESET
If V CC falls below the reset threshold, CE OUT goes high, inde-
pendent of the logic level at CE IN . This prevents the micropro-
cessor from writing erroneous data into RAM during power-up,
power-down, brownouts and momentary power interruptions.
Watchdog Timer
The microprocessor drives the Watchdog Input (WDI) with an
I/O line. When OSC IN and OSC SEL are unconnected, the
microprocessor must toggle the WDI pin once every 1.6 sec-
onds to verify proper software execution. If a hardware or soft-
ware failure occurs such that WDI not toggled, the ADM691/
SYSTEM STATUS
INDICATORS
Figure 24. ADM691/ADM693/ADM695 Typical Application
Reset Output
The internal voltage detector monitors V CC and generates a
RESET output to hold the microprocessor’s Reset line low
when V CC is below 4.65 V (4.4 V for ADM693). An internal
timer holds RESET low for 50 ms (200 ms for the ADM695)
after V CC rises above 4.65 V (4.4 V for ADM693). This prevents
repeated toggling of RESET even if the 5 V power drops out
and recovers with each power line cycle.
The crystal oscillator normally used to generate the clock for mi-
croprocessors can take several milliseconds to stabilize. Since
most microprocessors need several clock cycles to reset, RESET
must be held low until the microprocessor clock oscillator has
started. The power-up RESET pulse lasts 50 ms (200 ms for the
ADM695) to allow for this oscillator start-up time. If a different
reset pulse width is required, then a capacitor should be con-
nected to OSC IN or an external clock may be used. Please refer
to Table I and Figure 4. The manual reset switch and the 0.1 μ F
capacitor connected to the reset line can be omitted if a manual
reset is not needed. An inverted, active high, RESET output is
also available.
Power Fail Detector
The +5 V V CC power line is monitored via a resistive potential
divider connected to the Power Fail Input (PFI). When the
voltage at PFI falls below 1.3 V, the Power Fail Output ( PFO )
drives the processor’s NMI input low. If for example a Power
Fail threshold of 4.8 V is set with resistors R 1 and R 2 , the micro-
processor will have the time when V CC falls from 4.8 V to 4.65 V
to save data into RAM. An earlier power fail warning can be
generated if the unregulated dc input to the 5 V regulator is
available for monitoring. This will allow more time for micro-
processor housekeeping tasks to be completed before power is
lost.
ADM693 will issue a 50 ms (200 ms for ADM695) RESET
pulse after 1.6 seconds. This typically restarts the micro-
processor’s power-up routine. A new RESET pulse is issued
every 1.6 seconds until WDI is again strobed. If a different
watchdog timeout period is required, then a capacitor should be
connected to OSC IN or an external clock may be used. Please
refer to Table I and Figure 4.
The WATCHDOG OUTPUT ( WDO ) goes low if the watch-
dog timer is not serviced within its timeout period. Once WDO
goes low, it remains low until a transition occurs at WDI. The
watchdog timer feature can be disabled by leaving WDI
unconnected.
The RESET output has an internal 3 μ A pull-up, and can either
connect to an open collector reset bus or directly drive a CMOS
gate without an external pull-up resistor.
REV. A
–13 –
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADM695 | 制造商:AD 制造商全称:Analog Devices 功能描述:Microprocessor Supervisory Circuits |
| ADM695AN | 功能描述:IC SUPER MPU 4.65 100MA 16DIP 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 |
| ADM695ANZ | 功能描述:IC SUPER MPU 4.65 100MA 16DIP RoHS:是 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:100 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，开路漏极 复位:高有效/低有效 复位超时:最小为 250 ms 电压 - 阀值:4.37V，4.62V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SOIC 包装:管件 产品目录页面:1337 (CN2011-ZH PDF) |
| ADM695ANZ | 制造商:Analog Devices 功能描述:IC SUPERVISORY CIRCUIT |
| ADM695AQ | 制造商:Analog Devices 功能描述: 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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