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PCA8565TS Datasheet(PDF) 5 Page - NXP Semiconductors |
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PCA8565TS Datasheet(HTML) 5 Page - NXP Semiconductors |
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5 / 39 page  PCA8565_2 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 02 — 16 June 2009 5 of 39 NXP Semiconductors PCA8565 Real time clock/calendar 8. Device protection diagram 9. Functional description The PCA8565 contains sixteen 8-bit registers with an auto-incrementing address register, an on-chip 32.768 kHz oscillator with one integrated capacitor, a frequency divider which provides the source clock for the Real Time Clock (RTC), a programmable clock output, a timer, an alarm, a voltage-low detector and a 400 kHz I2C-bus interface. All 16 registers are designed as addressable 8-bit registers although not all bits are implemented: • The first two registers (memory address 00h and 01h) are used as control and status registers • The registers at memory addresses 02h through 08h are used as counters for the clock function (seconds up to years counters) • Address locations 09h through 0Ch contain alarm registers which define the conditions for an alarm • The register at address 0Dh controls the CLKOUT output frequency • At address 0Eh is the timer control register and address 0Fh contains the timer value The arrays SECONDS, MINUTES, HOURS, DAYS, WEEKDAYS, MONTHS, YEARS as well as the bit fields MINUTE_ALARM, HOUR_ALARM, DAY_ALARM and WEEKDAY_ALARM are all coded in Binary Coded Decimal (BCD) format. When one of the RTC registers is read the contents of all time counters are frozen. This prevents faulty reading of the clock or calendar during a carry condition (see Section 10.5.3). Fig 4. Device diode protection diagram of PCA8565 mce169 SDA VSS SCL INT CLKOUT OSCO VDD OSCI PCA8565 |
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