BLX8563-PARC SOP-8L

BLX8563 is a low-power CMOS real-time clock/calendar chip. It integrates a timer covering century, year, month, day, hour, minute, second, and day-of-week, functioning as a clock within the circuit. The system can set and read the current time stored in the BLX8563 for corresponding data processing (e.g., billing, display, logging). It integrates a programmable Alarm function that generates an interrupt when the current time matches the Alarm setting and the corresponding interrupt condition is enabled. It also integrates a programmable clock output, an interrupt output, a power-fail detector, and an on-chip oscillator capacitor, minimizing PCB routing and making it well-suited for complex systems. All addresses and data are transferred serially via the I2C bus interface, with I2C slave addresses of 0xA3 (read) and 0xA2 (write). The maximum bus speed is 400Kbits/s. After each read/write operation, the built-in word address register auto-increments, enabling sequential read/write access. BLX8563 features sixteen 8-bit registers, an auto-increment address register, a built-in 32.768KHz oscillator (with an integrated internal capacitor), a frequency divider (providing the source clock for the RTC and programmable clock output), a timer, an alarm, a power-fail detector, and an I2C bus interface supporting clock frequencies up to 400KHz. All sixteen registers are externally accessible, though not all data bits are used. Addresses 00H and 01H are control/status registers; registers 02H–08H are clock counters (seconds through years); 09H–0CH define alarm conditions; 0DH controls the output frequency of the CLKOUT pin; 0EH and 0FH are the timer control register and timer register, respectively. The seconds, minutes, hours, day, month, year, minute alarm, hour alarm, and date alarm registers are BCD-encoded, while the day-of-week register and day-of-week alarm register are not BCD-encoded. When any timekeeping register is read externally, the contents of all counters are latched, preventing misreads of clock/calendar data.

Applications

• Battery-powered products
• Portable and handheld devices
• Multi-rate energy meters, IC card water meters, IC card gas meters
• Mobile phones and fax machines
• Access control systems

Key features

• Wide operating voltage: 0.9V - 5.5V
• Low sleep current: 0.4μA (typical at 3.3V)
• I2C communication frequency up to 400KHz
• Century flag bit, perpetual calendar date range 2000 - 2199
• Programmable clock output: 32.768KHz, 1024Hz, 32Hz, 1Hz
• Integrated oscillator capacitor
• Integrated timer
• Integrated alarm function
• Integrated low-voltage detection
• Interrupt open-drain output
• Available in SOP8, TSSOP8 and other packages