900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf






AMI SEMICONDUCTOR

AMIS-70020 Datasheet Preview

AMIS-70020 Datasheet

Power Failure Elapsed Time Counter

No Preview Available !

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.
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.
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
1 second resolution (RC oscillator/1024)
• Autonomous operation during power failure
Auto switching to backup power
• Auto counter-start/stop function
www.DaMtaaSinhteeent4aUn.cceomfree buffer capacitor
- 6 hours back-up with 10mF
- Capacitor recharge management built in (no external
diode needed)
Li-button cell
- CR1220 (35mAh) supports up to 10 years in a typical
application
• Low current consumption <1µA
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
Mixing reactors
• 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
• 2-wire interface with standard I/O pins of a
microcontroller
• Operating temperature -10~85˚C
• 150 mils SO8 package
• Few external components
• Easy design-in due to a user friendly application board
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
1




AMI SEMICONDUCTOR

AMIS-70020 Datasheet Preview

AMIS-70020 Datasheet

Power Failure Elapsed Time Counter

No Preview Available !

AMIS-70020 Power Failure Elapsed Time Counter
4.0 Block Diagram
Data Sheet
VCC
1
CUT_OFF Test
38
VDD
2
C
CUT_OFF
COMPARATOR
POR
OUT_PORB
0
m3
1
CONTROL
CUT_OFF_CMD
Oscillator CLK_1K
1 kHz
0
Divider
(10 bits)
m1
1
0
m2
1
Current_source
Register/Counter
(15 bits)
0
m0
1 Q14_OUT
EN0
Q_OUT
5
UC_CLK_IN
CLK_1S
Uc_Clk
6
7
Clk
5.0 Packaging
4
VSS
wwTwhe.DAatMaSIShe-7e0t40U2.0coims packaged in a 150mils SO8. Please visit
http://www.amis.com/pdf/soic.pdf for detailed mechanical
information.
Pinout
Pad Description
Pad No. Name
1 VCC
2 VDD
3 CUT_OFF
4 VSS
5 Q_OUT
6 Uc_Clk
7 Clk
8 Test
AMI Semiconductor
www.amis.com
VCC
VDD
CTUeTst__OOFuFt
VSS
AMIS-
70020
Test
Clk
Uc_Clk
Q_Out
Type
Power
Power
Digital Output
Power
Digital Output
Digital Input
Digital Output
Digital Input
Comment
System power that is monitored
Back-up power
Not connected, test purpose only
Ground
Shift register output (CMOS output buffer 2mA)
CLK from microcontroller (Schmitt trigger input); an internal pull down (100K) is
connected on the pin
Internal oscillator/1024 (1Hz) (CMOS output buffer 2mA)
For normal operation: connect to GND
2


Part Number AMIS-70020
Description Power Failure Elapsed Time Counter
Maker AMI SEMICONDUCTOR
PDF Download

AMIS-70020 Datasheet PDF






Similar Datasheet

1 AMIS-70020 Power Failure Elapsed Time Counter
AMI SEMICONDUCTOR





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z



Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy