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參數資料
| 型號： | ADM8697 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Microprocessor Supervisory Circuits(微處理器監控電路) |
| 中文描述： | 微處理器監控電路（微處理器監控電路） |
| 文件頁數： | 7/12頁 |
| 文件大小： | 172K |
| 代理商： | ADM8697 |
ADM8696/ADM8697
REV. 0
–7–
can be chosen such that the voltage at PFI falls below 1.3 V
several milliseconds before the +5 V power supply falls below
the reset threshold.
PFO
is normally used to interrupt the
microprocessor so that data can be stored in RAM and the shut-
down procedure executed before power is lost.
ADM869x
POWER
FAIL
INPUT
R2
INPUT
POWER
POWER
FAIL
OUTPUT
R1
PFO
1.3V
Figure 7. Power Fail Comparator
T able II. Input and Output Status In Battery Backup Mode
Signal
Status
V
OUT
(ADM8696) V
OUT
is connected to V
BAT T
via an
internal PMOS switch.
Logic low.
Logic high. T he open circuit output voltage is
equal to V
OUT
.
Logic low.
(ADM8696) Logic high. T he open circuit volt-
age is equal to V
OUT
.
WDI is ignored. It is internally disconnected
from the internal pull-up resistor and does not
source or sink current as long as its input voltage
is between GND and V
OUT
. T he input voltage
does not affect supply current.
Logic high. T he open circuit voltage is equal to
V
OUT
.
T he Power Fail Comparator is turned off and
has no effect on the Power Fail Output.
Logic low.
CE
IN
is ignored. It is internally disconnected
from its internal pull-up and does not source or
sink current as long as its input voltage is be-
tween GND and V
OUT
. T he input voltage does
not affect supply current.
Logic high. T he open circuit voltage is equal to
V
OUT
.
OSC IN is ignored.
OSC SEL is ignored.
RESET
RESET
LOW LINE
BAT T ON
WDI
WDO
PFI
PFO
CE
IN
CE
OUT
OSC IN
OSC SEL
CE Gating and RAM Write Protection (ADM8697)
T he ADM8697 contains memory protection circuitry that
ensures the integrity of data in memory by preventing write
operations when LL
IN
is below the threshold voltage. When
LL
IN
is greater than 1.3 V,
CE
OUT
is a buffered replica of
CE
IN
,
with a 2 ns propagation delay. When LL
IN
falls below the 1.3 V
threshold, an internal gate forces
CE
OUT
high, independent of
CE
IN
.
CE
OUT
typically drives the CE, CS or Write input of battery
backed up CMOS RAM. T his ensures the integrity of the data
in memory by preventing write operations when V
CC
is at an in-
valid level.
ADM8697
LL
IN
LOW = 0
LL
IN
OK = 1
CE
IN
CE
OUT
Figure 5. Chip Enable Gating
t
1
= RESET TIME
V1 = RESET VOLTAGE THRESHOLD LOW
V2 = RESET VOLTAGE THRESHOLD HIGH
HYSTERESIS = V2–V1
V2
V2
V1
V1
LL
IN
LOW LINE
RESET
CE
OUT
t
1
t
1
CE
IN
Figure 6. Chip Enable Timing
Power Fail Warning Comparator
An additional comparator is provided for early warning of fail-
ure in the microprocessor’s power supply. T he Power Fail Input
(PFI) is compared to an internal +1.3 V reference. T he Power
Fail Output (
PFO
) goes low when the voltage at PFI is less than
1.3 V. T ypically PFI is driven by an external voltage divider
which senses either the unregulated dc input to the system’s 5 V
regulator or the regulated 5 V output. T he voltage divider ratio
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相關代理商/技術參數 |
參數描述 |
|---|---|
| ADM8697AN | 功能描述:IC SUPERVSR MPU ADJ/RESET 16DIP RoHS:否 類別:集成電路 (IC) >> PMIC - 監控器 系列:- 標準包裝:1 系列:- 類型:簡單復位/加電復位 監視電壓數目:1 輸出:開路漏極或開路集電極 復位:高有效 復位超時:- 電壓 - 閥值:1.8V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:6-TSOP（0.059"，1.50mm 寬）5 引線 供應商設備封裝:5-TSOP 包裝:剪切帶 (CT) 其它名稱:NCP301HSN18T1GOSCT |
| ADM8697ANZ | 功能描述:IC SUPERVSR MPU ADJ/RESET 16DIP RoHS:是 類別:集成電路 (IC) >> PMIC - 監控器 系列:- 標準包裝:1 系列:- 類型:簡單復位/加電復位 監視電壓數目:1 輸出:開路漏極或開路集電極 復位:高有效 復位超時:- 電壓 - 閥值:1.8V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:6-TSOP（0.059"，1.50mm 寬）5 引線 供應商設備封裝:5-TSOP 包裝:剪切帶 (CT) 其它名稱:NCP301HSN18T1GOSCT |
| ADM8697ARU | 制造商:AD 制造商全稱:Analog Devices 功能描述:Microprocessor Supervisory Circuits |
| ADM8697ARU-REEL | 功能描述:Supervisor Push-Pull, Push-Pull 1 Channel 16-TSSOP 制造商:analog devices inc. 系列:- 包裝:帶卷（TR） 零件狀態:上次購買時間 類型:備用電池電路 受監控電壓數:1 輸出:推挽式，推挽式 復位:高有效/低有效 復位超時:最小為 35 ms 電壓 - 閾值:1.3V 工作溫度:-40°C ~ 85°C（TA） 安裝類型:表面貼裝 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應商器件封裝:16-TSSOP 標準包裝:1 |
| ADM8697ARW | 功能描述:IC SUPERVSR MPU ADJ/RESET 16SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 監控器 系列:- 標準包裝:1 系列:- 類型:簡單復位/加電復位 監視電壓數目:1 輸出:開路漏極或開路集電極 復位:高有效 復位超時:- 電壓 - 閥值:1.8V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:6-TSOP（0.059"，1.50mm 寬）5 引線 供應商設備封裝:5-TSOP 包裝:剪切帶 (CT) 其它名稱:NCP301HSN18T1GOSCT |
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