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PT7C4302 PT7C4302PE PT7C4302WE PT0225 MS-001 MS-012 - Datasheet Archive
PT7C4302 Real-time Clock Module (3-wire Interface)
Data Sheet PT7C4302 PT7C4302 Real-time Clock Module (3-wire Interface) ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| Features Description · Using external 32.768kHz quartz crystal · Real-time clock (RTC) counts seconds, minutes power clock/calendar with a programmable square-wave hours, date of the month, month, day of the week, output and 31 bytes of nonvolatile RAM. The PT7C4302 PT7C4302 serial real-time clock is a low- Address and data are transferred serially via a 3- and year with leap-year compensation valid up to 2099 wire bus. The clock/calendar provides seconds, minutes, · 31-byte, nonvolatile (NV) RAM for data storage hours, day, date, month, and year information. The date · Time keeping voltage: 1.5V to 5.5V at the end of the month is automatically adjusted for · Uses less than 300nA at 2.0V months with fewer than 31 days, including corrections · Simple 3-wire interface for leap year. The clock operates in either the 24-hour or · Serial I/O for minimum pin count 12-hour format with AM/PM indicator. · Burst mode for reading/writing successive addresses Table 1 shows the basic functions of PT7C4302 PT7C4302. More details are shown in section: overview of functions. in clock/RAM · TTL-compatible (VCC = 5V) · Optional industrial temperature range: -40°C to Ordering Information +85°C Part Number PT7C4302PE PT7C4302PE Package Lead free 8-Pin DIP · Battery backup PT7C4302WE PT7C4302WE Lead free and Green 8-Pin SOIC · Trickle charger on chip for rechargeable energy source backup Table 1 Basic functions of PT7C4302 PT7C4302 Item Function PT7C4302 PT7C4302 Source: Crystal: 32.768kHz 1 Oscillator Oscillator enable/disable - Oscillator fail detect 12-hour 24-hour Century bit Time count chain enable/disable 2-wire I2C bus - 3-wire bus Burst mode Time display 2 Time 3 Communicat ion 31×8 Write protection 4 Control 5 RAM 6 Charger 7 Battery backup External clock test mode Power-on reset override PT0225 PT0225(08/09) Ver: 2 1 Data Sheet PT7C4302 PT7C4302 Real-time Clock Module (3-wire Interface) ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| Function Block PT7C4302 PT7C4302 X1 CD 32.768 kHz X2 OSC Counter Chain Time Counter (Sec,Min,Hour,Day,Date,Month,Year) 31 x 8 RAM CG Address Decoder VCC2 VCC1 Address Register I /O Interface (3-wires) Power Manager Shift Registers SCLK RST I/O Note: CD=CG=11pF PT0225 PT0225(08/09) Ver: 2 2 Data Sheet PT7C4302 PT7C4302 Real-time Clock Module (3-wire Interface) ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| Pin Configuration PT7C4302 PT7C4302 1 VCC1 VCC2 8 2 X1 SCLK 7 3 X2 I/O 6 4 GND RST 5 Pin Description Pin no. Pin Type Description 1 VCC2 P Primary power. When VCC2 is greater than VCC1 + 0.2V, VCC2 will power the IC. While VCC2