S-35392A
2-WIRE REAL-TIME CLOCK
www.sii-ic.com
Rev.3.0_00
© Seiko Instruments Inc., 2006-2012
The S-35392A is a CMOS 2-wire real-time clock IC which operates with the very low current consumption and in the wide
range of operation voltage. The operation voltage is 1.3 V to 5.5 V so that the S-35392A can be used for various power
supplies from main supply to backup battery. Due to the 0.45 μA current consumption and wide range of power supply voltage
at time keeping, the S-35392A makes the battery life longer. In the system which operates with a backup battery, the included
free registers can be used as the function for user’s backup memory. Users always can take back the information in the
registers which is stored before power-off the main power supply, after the voltage is restored.
The S-35392A has the function to correct advance / delay of the clock data speed, in the wide range, which is caused by the
oscillation circuit’s frequency deviation. Correcting according to the temperature change by combining this function and a
temperature sensor, it is possible to make a high precise clock function which is not affected by the ambient temperature.
Features
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Low current consumption:
0.45 μA typ. (VDD = 3.0 V, Ta = +25°C)
Constant output of 32.768 kHz clock pulse (Nch open-drain output)
Wide range of operating voltage:
1.3 V to 5.5 V
Built-in clock correction function
Built-in free user register
2-wire (I2C-bus) CPU interface
Built-in alarm interrupter
Built-in flag generator during detection of low power voltage or at power-on
Auto calendar up to the year 2099, automatic leap year calculation function
Built-in constant voltage circuit
Built-in 32.768 kHz crystal oscillator (Cd built in, Cg external)
*1
Lead-free, Sn 100%, halogen-free
*1. Refer to "
Product Name Structure" for details.
Applications
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Mobile game device
Mobile AV device
Digital still camera
Digital video camera
Electronic power meter
DVD recorder
TV, VCR
Mobile phone, PHS
Car navigation system
Package
• SNT-8A
Seiko Instruments Inc.
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