S-35390A 2-WIRE REAL-TIME CLOCK www.sii-ic.com SII Semiconductor Corporation, 2004-2016 Rev.4.2 02 The S-35390A is a CMOS 2-wire real-time clock IC which operates with the very low current consumption in the wide range of operation voltage. The operation voltage is 1.3 V to 5.5 V so that the S-35390A can be used for various power supplies from main supply to backup battery. Due to the 0.25 A current consumption and wide range of power supply voltage at time keeping, the S-35390A 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-35390A has the function to correct advance / delay of the clock data speed, in the wide range, which is caused by the crystal 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 Low current consumption: 0.25 A typ. (V = 3.0 V, Ta = +25C) DD Wide range of operating voltage: 1.3 V to 5.5 V Built-in clock correction function Built-in free user register 2 2-wire (I C-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 (built-in C , external C ) d g *1 Lead-free, Sn 100%, halogen-free *1. Refer to Product Name Structur for details. Applications Mobile game device Mobile AV device Digital still camera Digital video camera Electronic power meter DVD recorder TV, VCR Mobile phone, PHS Packages 8-Pin SOP (JEDEC) 8-Pin TSSOP SNT-8A 1 2-WIRE REAL-TIME CLOCK S-35390A Rev.4.2 02 Block Diagram INT1 Divider, INT1 XIN Oscillation timing generator controller circuit INT1 register XOUT Comparator 1 Clock correction register Real-time data register Status register 1 Day of Second Minute Hour Day Month Year the week Status register 2 Comparator 2 Free register INT2 INT2 INT2 register Low power supply VDD voltage detector controller Power-on SDA Serial detection circuit Shift register interface Constant-voltage SCL circuit VSS Figure 1 2