AMIS-70020 timer that measures duration power failures five hours. AMI

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AMIS-70020 timer that measures duration power failures five hours. AMI

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AMIS-70020 Power Failure Elapsed Time Counter
AMIS-70020 timer that measures duration power failures five hours. AMIS-70020 starts stops counting automatically triggered voltage input signal VCC. When gets lower than reference signal VTH, power cut-off flagged AMIS-70020 starts counting. During counting phase AMIS-70020 powered external capacitor primary battery consequently operates independently external power supply. power design AMIS-70020, device count full scale autonomously using energy stored 10mF capacitor. soon comes again counting stops. value counter shifted digital Q_OUT output communicated microprocessor. After shifting full counted value, internal RC-oscillator signal Q_OUT output pin. Using this data microcontroller calculate duration power failure. internal power management circuit manages recharge external buffer capacitor.
external components required build AMIS70020 into application result cost effective solution footprint less than 2cm2. combination internal oscillator microcontroller software algorithm eliminate requirement space cost consuming external crystal. Typical applications those sensitive power failures that have built-in function. Examples are: Power inverters/Motordrivers/Soft starters Accurate protection possible even after power loss Thermal protection devices electrical motors without integrated thermistor Motor controllers electrical motors without integrated thermistor Process control Chemical processes Industrial mixers Mixing reactors
Features
Measures time elapsed during power failure Measures five hours second resolution oscillator/1024) Autonomous operation during power failure Auto switching backup power Auto counter-start/stop function Maintenance free buffer capacitor hours back-up with 10mF Capacitor recharge management built external diode needed) Li-button cell CR1220 (35mAh) supports years typical application current consumption <1µA Built-in 1kHz oscillator external oscillator required Frequency oscillator read external microcontroller Accurate time measurement possible using software calibration algorithm 2-wire interface with standard pins microcontroller Operating temperature -10~85°C mils package external components Easy design-in user friendly application board
Ordering Information
Ordering Code Package Temp. Range Ordering Code AMIS-70020 -10°C.-85°C EVK-70020 Evaluation
sample requests contact your local sales representative www.amis.com/sales.
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AMIS-70020 Power Failure Elapsed Time Counter
Block Diagram
CUT_OFF Test
CUT_OFF Switch
Test_Detect
CUT_OFF COMPARATOR
OUT_PORB CUT_OFF_CMD CONTROL
Oscillator CLK_1K
Divider bits)
Register/Counter bits)
Q14_OUT
Q_OUT
UC_CLK_IN
Uc_Clk
CLK_1S
Current_source
Packaging
AMIS-70020 packaged 150mils SO8. Please visit detailed mechanical information. Pinout
Test_Out CUT_OFF
Test
AMIS70020
Uc_Clk Q_Out
Description Name CUT_OFF Q_OUT Uc_Clk Test Type Power Power Digital Output Power Digital Output Digital Input Digital Output Digital Input Comment System power that monitored Back-up power connected, test purpose only Ground Shift register output (CMOS output buffer 2mA) from microcontroller (Schmitt trigger input); internal pull down (100K) connected Internal oscillator/1024 (1Hz) (CMOS output buffer 2mA) normal operation: connect
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AMIS-70020 Power Failure Elapsed Time Counter
Application Diagram
Supply
100nF
MICRO
CUT_OFF
power supplies chip need properly decoupled. This means that least external capacitor must connected between VCC. Typical External Components Component Capacitor Capacitor Battery Function Filter Backup power supply Backup power supply Typical Value CR1220 (35mAh) Unit Either buffer capacitor Li-battery selected backup power supply. case Li-battery used backup power supply diode must placed between AMIS-70020 battery disable charging feature.
Electrical Environmental Ratings
Operating Ranges This section defines limits functional operation parametric characteristics device described elsewhere this document. Note that functionality outside operating ranges guaranteed. Symbol Tamb Description Power supply voltage Power supply voltage Ambient temperature under bias Junction temperature Load capacitance outputs Digital input levels Digital output levels Operation outside operating ranges extended periods affect device reliability. Total cumulative dwell time above maximum operating rating power supply temperature must less than hours. Unit 30%VDD
Test
AMIS70020
Uc_Clk Q_Out
Input operating range digital IO's 0-VDD Output operating range digital IO's 0-VDD
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AMIS-70020 Power Failure Elapsed Time Counter
Absolute Maximum Ratings Stresses above those listed this clause cause immediate permanent device failure. implied that more than these conditions applied simultaneously.
Symbol VDDmr Tamb,mr Tj,mr
Description Power supply voltage Power supply voltage Ambient temperature under bias Junction temperature Digital input levels
-0.3 -0.3
Unit
Electrical Overstress Immunity Electrostatic discharges component level: device withstands 2000V Human Body Model pulses when tested according method 3015.5 (pin combination Latch-up immunity: Static latch-up protection level 100mA 25°C when tested according EIA/JESD78.
Detailed Electrical Functional Description
Digital Interface digital interface with microcontroller made means only digital connections. first clock signal applied AMIS-70020 UC_CLK second data line read microcontroller from Q_OUT pin. After after power failure (CUT_OFF) shift register loaded with counter value connected Q_OUT pin. most significant bit, already present read Q_OUT pin. Applying clocks maximum rate 10MHz UC_CLK will shift remaining counter bits. After fifteenth clock, internal oscillator frequency will connected Q_OUT running clock signal. measuring period this signal, time cut-off present calculated microcontroller. internal pull down resistor connected Q_OUT, order avoid parasitic shift counting register. powered third optional gives counter clock signal about 1Hz. This clock internal oscillator, divided 1024 also used calibrate application. Connections made with microcontroller separated level shifters. When power failure mode, inputs AMIS-70020 fixed zero state. This will prevent unwanted current leaking.
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AMIS-70020 Power Failure Elapsed Time Counter
Timing Diagram
Flowchart flowchart depicts operation AMIS-70020 case gets smaller than VDD-VTH. After this flow been finished buffer capacitor recharged timer ready cycle.
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AMIS-70020 Power Failure Elapsed Time Counter
Description Main Building Blocks Oscillator AMIS-70020 integrates oscillator that functions without external components. maximum accuracy time measurement only obtained measured time calibrated with actual oscillator Symbol Fosc Comparator When VTH, comparator output (CUT_OFF) commuted. CUT_OFF signal used digital control circuit cut_off mode. Description Absolute frequency ambient
frequency. This done since oscillator output frequency measured microcontroller Q_out after measured counter value been shifted register. Unit
Symbol
Description VDD-VCC threshold
0.75
1.75
Unit
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AMIS-70020 Power Failure Elapsed Time Counter
Power Reset
Symbol Vpor THreset TLreset Cut_off Switch
1.65 2.25 3.08 Value testable Value testable
Unit
controlled cut_off_ctrl when comparator filter have detected loss VCC, this case switch OFF. Symbol Description Resistance switch Unit
Current Consumption Symbol Description current cut_off mode load Test_OUT, Q_OUT Unit
Revision Number Version
Changes page
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Copyright 2003 Semiconductor rights reserved. Information furnished believed accurate reliable. However, Semiconductor assumes responsibility errors omissions information consequences such information. Semiconductor reserves right change information contained herein time without notice. This information provided without warranty kind, either expressed implied, including, limited implied warranties merchantability, fitness particular purpose, non-infringement intellectual property. title intellectual property rights including, without limitation, copyrights, trademarks, this information products owned Semiconductor, protected applicable laws. license under patent other intellectual property Semiconductor granted, implication, estoppel otherwise.

AMIS-70020 timer that measures duration power failures five hours. AMI

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