PT7C43390 Real-time Clock Module Features Description 2 Low current consumption: 0.3A typ. (V =3.0V, The PT7C43390 is a CMOS I C-bus real-time clock IC, DD T = 25C) which operates with the very low current consumption A Wide operating voltage range: 1.35 to 5.5 V and in the wide range of operation voltage. The Minimum time keeping operation voltage: 1.25 V operation voltage is 1.35 V to 5.5 V so that the RTC can Built-in clock adjustment function be used for various power supplies from main supply to Built-in free user register backup battery. In the system which operates with a 2 2-wire (I C-bus) CPU interface backup battery, the included free registers can be used as Built-in alarm interrupter the function for users backup memory. Users always Built-in flag generator at power down or power on can take back the information in the registers which is Auto calendar up to the year 2099, automatic leap stored before power-off the main power supply, after the year calculation function voltage is restored. Built-in constant voltage circuit The IC has the function to correct advance / delay of the Built-in 32 kHz crystal oscillator circuit clock data speed, in the wide range, which is caused by Package: SOIC-8L, TSSOP-8L, and TDFN2x3-8L the oscillation circuits 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. Function Table Applications Item Function PT7C43390 * Mobile game device, mobile phone 1 Oscillator Source Crystal Industrial control Time 12-hour 2 Time Electronic power meter display 24-hour Alarm interrupt pin output DVD recorder Interrup 2 3 t Car navigation Timer interrupt output 1Hz,2Hz,4Hz IP Camera, DVR, NVR Programmable square wave output 4 8Hz,16Hz (Hz) Pin Configuration 32kHz 2 2-wire I C bus Commu PT7C43390 5 nication Burst mode 1 VDD 8 INT1 IC test mode Power-on detector 6 Control 2 XOUT SDA 7 Power supply voltage detector 3 XIN 6 SCL 7 Clock calibration 80 Free register access 4 5 VSS INT2 SOIC-8 TSSOP-8 DFN2*3 2015-03-0008 PT0280-6 03/24/15 1 PT7C43390 Real-time Clock Module Pin Description Pin Pin Type Description No. Name Output for Interrupt Signal 1. This pin outputs a signal of interrupt, or a clock pulse. By using the status register 2, users can select either of: alarm 1 1 O INT1 interrupt, output of user-set frequency, per-minute edge interrupt, minute-periodical interrupt 1, minute- periodical interrupt 2, or 32.768 kHz output. This pin has NCH open drain output. Oscillator Circuit Output. Together with X1, 32.768kHz crystal is connected between them. When 2 XOUT O 32.768kHz external input, X2 must be float. Oscillator Circuit Input. Together with X1, 32.768kHz crystal is connected between them. Or external 3 XIN I clock input. 4 VSS P Negative power supply pin. Connects to GND. Output for Interrupt Signal 2. This pin outputs a signal of interrupt, or a clock pulse. By using the 5 INT2 O status register 2, users can select either of: alarm2 interrupt, output of user-set frequency, or minute- periodical interrupt 1. This pin has NCH open drain output. 2 Serial clock input pin. This pin is to input a clock pulse for I C-bus interface. The SDA pin SCL I 6 inputs/outputs data by synchronizing with the clock pulse. 2 Serial Data Input/Output. This is a data input / output pin of I C-bus interface. This pin inputs / outputs data by synchronizing with a clock pulse from the SCL pin. This pin has CMOS input and NCH 7 SDA I/O open drain output. Generally in use, pull up this pin to the V potential via a resistor, and connect it to DD any other device having open drain or open collector output with wired-OR connection. 8 VDD P Positive power supply pin. Connect this VDD pin with a positive power supply. Block Diagram INT1 Divider, XIN Oscillator INT controller 1 Timing generator XOUT INT register 1 Clock correction register Comparator 1 Status register 1 Real-time data register Day of Second Minute Hour Day Month Year Status register 2 Week Free register Comparator 2 Low power supply VDD voltage detector INT2 INT register 2 Power-on INT controller 2 detection circuit Constant-voltage SIO INT register 2 Serial circuit interface VSS SCL PT7C43390 2015-03-0008 PT0280-6 03/24/15 2