AMI Semiconductor
AMIS-70020 Power Failure Elapsed Timer Counter
Key Features
• Measures the time elapsed during a power failure
Measures up to five hours
One second resolution (RC oscillator/1024)
°
• Autonomous operation during power failure
°
Auto switching to backup power
• Auto counter-start/stop function
°
Maintenance free buffer capacitor
°
- Six hours back-up with 10mF
- Capacitor recharge management built in
(no external diode needed)
Li-button cell
°
- CR1220 (35mAh) supports up to ten years in a typical
application
• Low current consumption <1µA
• 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
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• Two-wire interface with standard I/O pins of a microcontroller
• Operating temperature -10~85°C
• SO8-150mils-green package
• Few external components
• Easy design-in due to a user friendly application board
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 cutoff
is flagged and the AMIS-70020 starts counting. During the
counting phase the AMIS-70020 is powered by an
recharge of the external buffer 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.
external capacitor or by
a primary battery and
Typical applications are those sensitive to power failures
that do not have a built-in UPS function. Examples are:
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.
• Power inverters/motordrivers/soft starters
Accurate I2t protection possible even after power loss
Thermal protection devices for electrical motors
°
without integrated thermistor
°
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.
Motor controllers for electrical motors without
integrated thermistor
• Process control
°
Chemical processes
Industrial mixers
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Mixing reactors
°
°
The internal power management circuit manages the
Ordering Codes
Marketing Name
AMIS70020AGA
Ordering Code (Tubes)
0MTHA-004-XTD
Ordering Code (Tape)
0MTHA-004-XTP
Package
Temperature Range
-10°C...+85°C
SOIC-8 GREEN
Marketing Name
EVK-70020
Ordering Code (Evaluation Kit)
D1FNDN
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