1339 Datasheet | Renesas

Description The 1339 serial real-time clock (RTC) is a low-power clock/date device with two programmable time-of-day alarms and a programmable square-wave output. Address and data are transferred serially through an I2C bus. The clock/date 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. The 1339 has a built-in power-sense circuit that detects power failures and automatically switches to the backup supply, maintaining time, date, and alarm operation. Applications - Handhelds (GPS, POS terminals) - Consumer Electronics (Set-Top Box, Digital Recording, Network Applications) - Office (Fax/Printers, Copiers) - Medical (Glueter, Medicine Dispensers) - Telem (Routers, Switches, Servers) - Other (Thermostats, Vending Machines, Modems, Utility Meters) Features - Real-Time Clock (RTC) counts seconds, minutes, hours, day, date, month, and year with leap-year pensation valid up to 2100 - Packaged in 8-TSSOP, 8-SOIC, or 16-SOIC (surface-mount package with an integrated crystal) - Fast mode I2C Serial interface - Two time-of-day alarms - Programmable square-wave output - Oscillator stop flag - Automatic power-fail detect and switch circuitry - Trickle-charge capability - Industrial temperature range (-40°C to +85°C) - Underwriters Laboratory (UL) recognized Block Diagram Crystal inside package for 16-pin SOIC ONLY X1 X2 GND VCC VBACKUP Trickle Charger 32.768 k Hz Oscillator and Divider 1Hz / 4.096k Hz / 8.192k Hz / 32.768k Hz MUX/ Buffer Power Control Control Logic Clock, Calendar Counter SQW/INT SCL SDA Trickle...