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参数资料
| 型号： | ADM8697ARW |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 电源管理 |
| 英文描述： | bqTINY-II Dual Input USB/AC Adpater 1-Cell Li-Ion Charger w/Charge Enable & AC Present, No Taper 10-SON -40 to 85 |
| 中文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO16 |
| 封装： | MS-013AA, SOIC-16 |
| 文件页数： | 7/12页 |
| 文件大小： | 195K |
| 代理商： | ADM8697ARW |
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
相关PDF资料 |
PDF描述 |
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| ADM8698AN | bqTINY-II Dual Input USB/AC Adpater 1-Cell Li-Ion Charger w/Charge Enable & AC Present, No Taper 10-SON -40 to 85 |
| ADM8698ARN | bqTINY-II Dual Input USB/AC Adpater 1-Cell Li-Ion Charger w/Charge Enable & AC Present, No Taper 10-SON -40 to 85 |
| ADM8698ARW | Dual Input Li-Ion Charger with Dynamic Power-Path Management, Output regulated to 6V, Vbat 4.2V 20-QFN -40 to 85 |
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| ADM8699ARN | Dual Input Li-Ion Charger with Dynamic Power-Path Management, Output Regulated to 6V Battery 20-QFN -40 to 125 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ADM8697ARW-REEL | 功能描述:IC SUPERVSR MPU ADJ/RESET 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 |
| ADM8697ARWZ | 功能描述:IC SUPERVSR MPU ADJ/RESET 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 |
| ADM8698 | 制造商:AD 制造商全称:Analog Devices 功能描述:Microprocessor Supervisory Circuits |
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