PT7C4302WEX

PT7C4302 Real-time Clock Module (3-wire Interface) ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| Description Features  Using external 32.768kHz quartz crystal  Real-time clock (RTC) counts seconds, minutes hours, date of the month, month, day of the week, and year with leap-year compensation valid up to 2099   31-byte, nonvolatile (NV) RAM for data storage Time keeping voltage: 1.5V to 5.5V  Uses less than 300nA at 2.0V  Simple 3-wire interface   Serial I/O for minimum pin count Burst mode for reading/writing successive addresses in clock/RAM   TTL-compatible (VCC = 5V) Optional industrial temperature range: -40°C to +85°C Battery backup   The PT7C4302 serial real-time clock is a lowpower clock/calendar with a programmable square-wave output and 31 bytes of nonvolatile RAM. Address and data are transferred serially via a 3wire bus. The clock/calendar provides seconds, minutes, hours, day, date, month, and year information. The date at the end of the month is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in either the 24-hour or 12-hour format with AM/PM indicator. Table 1 shows the basic functions of PT7C4302. More details are shown in section: overview of functions. Pin Assignment PT7C4302 1 Trickle charger on chip for rechargeable energy source backup VCC2 VCC1 8 2 X1 SCLK 7 3 X2 I/O 6 4 GND RST 5 DIP-8 SOIC-8 Pin Description Pin no. Pin Type Description 1 VCC 2 P Primary power. When VCC2 is greater than VCC1 + 0.2V, VCC2 will power the IC. While VCC2