AMIS-70020

更新时间： 2024-02-29 19:51:17

品牌	Logo	应用领域
AMI		计数器电源电路电源管理电路光电二极管
页数	文件大小	规格书
7页	331K
描述
Power Failure Elapsed Time Counter

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技术参数
数据手册

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AMIS-70020 技术参数

生命周期：	Transferred	零件包装代码：	SOIC
包装说明：	0.150 INCH, SO-8	针数：	8
Reach Compliance Code：	unknown	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.18
Is Samacsys：	N	可调阈值：	NO
模拟集成电路 - 其他类型：	POWER SUPPLY SUPPORT CIRCUIT	JESD-30 代码：	R-PDSO-G8
长度：	4.9 mm	信道数量：	1
功能数量：	1	端子数量：	8
最高工作温度：	85 °C	最低工作温度：	-10 °C
封装主体材料：	PLASTIC/EPOXY	封装代码：	SOP
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE
认证状态：	Not Qualified	座面最大高度：	1.72 mm
最大供电电压 (Vsup)：	5.5 V	最小供电电压 (Vsup)：	4.5 V
标称供电电压 (Vsup)：	5 V	表面贴装：	YES
温度等级：	OTHER	端子形式：	GULL WING
端子节距：	1.27 mm	端子位置：	DUAL
宽度：	3.9 mm	Base Number Matches：	1

AMIS-70020 数据手册

AMIS-70020 Power Failure Elapsed Time Counter

Data Sheet

1.0 General Description

The AMIS-70020 is a timer IC that measures the duration of

power failures of up to five hours. The AMIS-70020 starts

and stops counting automatically as it is triggered by the

voltage of the input signal VCC. When VCC gets lower than

the reference signal VDD - VTH, a power cut-off is flagged

and the AMIS-70020 starts counting. During the counting

phase the AMIS-70020 is powered by an external capacitor

or by a primary battery and consequently operates

independently of an external power supply. Due to the low

power design of the AMIS-70020, the device can count the

full scale autonomously using the energy stored in a 10mF

capacitor.

The few external components required to build the AMIS-

70020 into its application result in a cost effective solution

and in a footprint of less than 2cm². The combination of an

internal oscillator and a microcontroller software algorithm

eliminate the requirement for a space and cost consuming

external crystal.

Typical applications are those sensitive to power failures

that do not have a built-in UPS function. Examples are:

• Power inverters/Motordrivers/Soft starters

• Accurate I²t protection possible even after power loss

• Thermal protection devices for electrical motors

without integrated thermistor

• Motor controllers for electrical motors without

integrated thermistor

• Process control

• Chemical processes

• Industrial mixers

As soon as VCC comes up again counting stops. The value

of the counter is shifted to the digital Q_OUT output pin

and is communicated to a microprocessor. After shifting the

full counted value, the internal RC-oscillator signal is put on

the Q_OUT output pin. Using this data the microcontroller

can calculate the duration of the power failure.

• Mixing reactors

The internal power management circuit manages the

recharge of the external buffer capacitor.

2.0 Key Features

• Measures the time elapsed during a power failure

• Measures up to five hours

• Built-in 1kHz oscillator

• No external oscillator required

• Frequency of oscillator can be read by an external

microcontroller

• Accurate time measurement possible using software

calibration algorithm

• 1 second resolution (RC oscillator/1024)

• Autonomous operation during power failure

• Auto switching to backup power

• Auto counter-start/stop function

• Maintenance free buffer capacitor

- 6 hours back-up with 10mF

• 2-wire interface with standard I/O pins of a

microcontroller

- Capacitor recharge management built in (no external

diode needed)

• Operating temperature -10~85˚C

• 150 mils SO8 package

• Li-button cell

• Few external components

- CR1220 (35mAh) supports up to 10 years in a typical

application

• Easy design-in due to a user friendly application board

• Low current consumption <1µA

3.0 Ordering Information

Ordering Code AMIS-70020

Package

SO8

Temp. Range

-10°C…-85°C

Ordering Code EVK-70020

Evaluation kit

For sample requests contact your local sales representative

at www.amis.com/sales.

AMI Semiconductor

www.amis.com

12 3 4 5 6 7

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