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PDF PCF8564A Data sheet ( Hoja de datos )
| Número de pieza | PCF8564A | |
| Descripción | Real time clock and calendar | |
| Fabricantes | NXP Semiconductors | |
| Logotipo |  |
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PCF8564A
Real time clock and calendar
Rev. 3 — 26 August 2013
Product data sheet
1. General description
The PCF8564A is a CMOS1 real-time clock and calendar optimized for low power
consumption. A programmable clock output, interrupt output and voltage low detector are
also provided. All addresses and data are transferred serially via the two-line bidirectional
I2C-bus. Maximum bus speed is 400 kbit/s. The built-in word address register is
incremented automatically after each written or read data byte.
2. Features and benefits
Provides year, month, day, weekday, hours, minutes, and seconds based on a
32.768 kHz quartz crystal
Wide clock operating voltage: 1.0 V to 5.5 V
Low back-up current typical 250 nA at 3.0 V and 25 C
400 kHz two-wire I2C interface (1.8 V to 5.5 V)
Low-voltage detector
Alarm and timer functions
Two integrated oscillator capacitors
Programmable clock output for peripheral devices (32.768 kHz, 1.024 kHz, 32 Hz, and
1 Hz)
Internal Power-On Reset (POR)
I2C slave address: read A3h, write A2h
3. Applications
Timing devices
Time of the day tracking
Process timing
Alarm
Portable instruments
Electronic metering
Battery powered products
1. The definition of the abbreviations and acronyms used in this data sheet can be found in Section 20.
1 page  
NXP Semiconductors
PCF8564A
Real time clock and calendar
8. Functional description
The PCF8564A contains sixteen 8-bit registers with an auto-incrementing address
register, an on-chip 32.768 kHz oscillator with integrated capacitors, a frequency divider
which provides the source clock for the RTC, a programmable clock output, a timer, a
voltage low detector, and a 400 kHz I2C-bus interface.
All sixteen registers (see Table 5) are designed as addressable 8-bit parallel registers
although not all bits are implemented. The first two registers (memory address 00h and
01h) are used as control and/or status registers. The 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. Address
0Dh controls the CLKOUT output frequency. 0Eh and 0Fh are the timer control and timer
registers, respectively.
The seconds, minutes, hours, days, months, years, as well as the minute alarm, hour
alarm, and day alarm registers are all coded in BCD format.
8.1 CLKOUT output
A programmable square wave is available at the CLKOUT pin. Frequencies of
32.768 kHz, 1.024 kHz, 32 Hz and 1 Hz can be generated for use as a system clock,
microcontroller clock, input to a charge pump, or for calibration of the oscillator. CLKOUT
is a CMOS push-pull output, and if disabled it becomes logic 0.
PCF8564A
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 26 August 2013
© NXP B.V. 2013. All rights reserved.
5 of 48
5 Page 
NXP Semiconductors
PCF8564A
Real time clock and calendar
Table 15. Weekday assignments
Day[1]
Bit
2
Sunday
0
Monday
0
Tuesday
0
Wednesday
0
Thursday
1
Friday
1
Saturday
1
[1] Definition may be re-assigned by the user.
1
0
0
1
1
0
0
1
0
0
1
0
1
0
1
0
8.4.6 Register Months
Table 16. Months - months and century flag register (address 07h) bit description
Bit Symbol Value Place value Description
7 C[1]
0[2] -
indicates the century is x
1-
indicates the century is x + 1
6 to 5 -
--
unused
4 MONTHS 0 to 1 ten’s place actual month coded in BCD format, see Table 17
3 to 0
0 to 9 unit place
[1] This bit may be re-assigned by the user.
[2] This bit is toggled when the register Years overflows from 99 to 00.
Table 17. Month assignments coded in BCD format
Month
Upper-digit Digit (unit place)
(ten’s place)
Bit 4
Bit 3
Bit 2
January
0
0
0
February
0
0
0
March
0
0
0
April
0
0
1
May 0 0 1
June
0
0
1
July 0 0 1
August
0
1
0
September 0 1 0
October
1
0
0
November
1
0
0
December
1
0
0
Bit 1
0
1
1
0
0
1
1
0
0
0
0
1
Bit 0
1
0
1
0
1
0
1
0
1
0
1
0
PCF8564A
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 26 August 2013
© NXP B.V. 2013. All rights reserved.
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