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| 型号： | ADM8697ARWZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/13页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVSR MPU ADJ/RESET 16SOIC |
| 标准包装： | 47 |
| 类型： | 备用电池电路 |
| 监视电压数目： | 1 |
| 输出： | 推挽式，推挽式 |
| 复位： | 高有效/低有效 |
| 复位超时： | 最小为 35 ms |
| 电压 - 阀值： | 1.3V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 16-SOIC W |
| 包装： | 管件 |
ADM8696/ADM8697
TYPICAL APPLICATIONS
ADM8696
Figure 18 shows the ADM8696 in a typical power monitoring,
battery backup application. V OUT powers the CMOS RAM.
Under normal operating conditions with V CC present, V OUT is
internally connected to V CC . If a power failure occurs, V CC will
decay and V OUT will be switched to V BATT , thereby maintaining
Figure 18b shows a similar application for the ADM8696 but in
this case the PFI input monitors the unregulated input to the
7805 voltage regulator. This gives an earlier warning of an im-
pending power failure. It is useful with processors operating at
low speeds or where there are a significant number of house-
keeping tasks to be completed before the power is lost.
power for the CMOS RAM.
Power Fail RESET
The V CC power supply is also monitored by the Low Line In-
INPUT
POWER
7805
0.1 μ F
0.1 μ F
PFO
RESET
put, LL IN . A RESET pulse is generated when LL IN falls below
1.3 V. RESET will remain low for 50 ms after LL IN returns
above 1.3 V. This allows for a power-on reset and prevents re-
peated toggling of RESET if the V CC power supply is unstable.
Resistors R3 and R4 should be chosen to give the desired V CC
reset threshold.
Watchdog Timer
The Watchdog Timer Input (WDI) monitors an I/O line from
the μ P system. This line must be toggled once every 1.6 s to
verify correct software execution. Failure to toggle the line indi-
cates that the μ P system is not correctly executing its program
R1
R2
R3
R4
3V
BATTERY
NC
RESET
V CC BATT V OUT
ON
V BATT
ADM8696
PFI
GND
WDI
OSC IN
OSC SEL
LL IN
LOW LINE WDO
V CC
CMOS RAM
A0–A15
I/O LINE
NMI
RESET
μ P
POWER
μ P
and may be tied up in an endless loop. If this happens, a reset
pulse is generated to initialize the processor.
If the watchdog timer is not needed the WDI input should be
left floating.
Power Fail Detector
The Power Fail Input, PFI, monitors the input power supply via
a resistive divider network R1 and R2. This input is intended as
an early warning power fail input. The voltage on the PFI input
is compared with a precision 1.3 V internal reference. If the in-
put voltage drops below 1.3 V, a power fail output (PFO) signal
is generated. This warns of an impending power failure and may
be used to interrupt the processor so that the system may be
shut down in an orderly fashion. The resistors in the sensing
network are ratioed to give the desired power fail threshold volt-
age V T . The threshold should be set at a higher voltage than the
RESET threshold so there is sufficient time available to com-
plete the shutdown procedure before the processor is RESET
and power is lost.
SYSTEM STATUS
INDICATORS
Figure 18b. ADM8696 Typical Application Circuit B
This application also shows an optional external transistor that
may be used to provide in excess of 100 mA current on V OUT .
When V CC is higher than V BATT , the BATT ON output goes
low, providing 25 mA of base drive for the external PNP transis-
tor. The maximum current available is dependent on the power
rating of the external transistor.
RAM Write Protection
The ADM8697 CE OUT line drives the Chip Select inputs of the
CMOS RAM. CE OUT follows CE IN as long as LL IN is above the
reset threshold. If LL IN falls below the reset threshold, CE OUT
goes high, independent of the logic level at CE IN . This prevents
the microprocessor from writing erroneous data into RAM dur-
ing power-up, power-down, brownouts and momentary power
interruptions.
+5V
R3
R1
V CC
μ P POWER
RESET
R4
R2
PFI V OUT
LL IN
ADM8696
CMOS RAM
POWER
μ P SYSTEM
RESET
μ P RESET
BATTERY
+
V BATT
GND
PFO
WDI
μ P NMI
I/O LINE
Figure 18a. ADM8696 Typical Application Circuit A
–10 –
REV. A
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相关代理商/技术参数 |
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| ADM8698 | 制造商:AD 制造商全称:Analog Devices 功能描述:Microprocessor Supervisory Circuits |
| ADM8698AN | 功能描述:IC SUPERVISOR MPU 4.65V 8DIP 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 |
| ADM8698ANZ | 功能描述:IC SUPERVISOR MPU 4.65V 8DIP RoHS:是 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 |
| ADM8698ARN | 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 |
| ADM8698ARN-REEL | 制造商:Analog Devices 功能描述:Processor Supervisor 4.65V 3V to 5.5V 8-Pin SOIC N T/R 制造商:Analog Devices 功能描述:IMPROVED ADM698 - Tape and Reel 制造商:Rochester Electronics LLC 功能描述:IMPROVED ADM698 - Tape and Reel |
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