PCF8564A
Real time clock and calendar
Rev. 3 — 26 August 2013
Product data sheet
1. General description
The PCF8564A is a CMOS
1
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
I
2
C-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 I
2
C 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)
I
2
C 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.
NXP Semiconductors
PCF8564A
Real time clock and calendar
4. Ordering information
Table 1.
Ordering information
Package
Name
PCF8564AU
PCF8564AUG
bare die
bare die
Description
wire bond die; 9 bonding pads
9 bumps
Version
PCF8564AU
PCF8564AUG
Type number
4.1 Ordering options
Table 2.
Ordering options
Sales item (12NC)
935289478005
935289319015
935289477015
935293569015
935301011005
Orderable part number
PCF8564AU/10AB/1,0
PCF8564AU/5BB/1,01
PCF8564AU/5GB/1,01
PCF8564AU/5GC/1,01
PCF8564AUG/12HB/1V
IC
revision
1
1
1
1
1
Delivery form
wafer, sawn, on FFC
unsawn wafer
unsawn wafer
unsawn wafer
wafer, sawn, on 8 inch metal
FFC; chips with soft bumps
[1]
Product type number
PCF8564AU/10AB/1
PCF8564AU/5BB/1
PCF8564AU/5GB/1
PCF8564AU/5GC/1
PCF8564AUG/12HB/1
[1]
Bump hardness, see
Table 36.
5. Marking
Table 3.
Marking codes
Marking code
PC8564A-1
PC8564A-1
Type number
PCF8564AU
PCF8564AUG
PCF8564A
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2013. All rights reserved.
Product data sheet
Rev. 3 — 26 August 2013
2 of 48
NXP Semiconductors
PCF8564A
Real time clock and calendar
6. Block diagram
Fig 1.
Block diagram of PCF8564A
PCF8564A
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2013. All rights reserved.
Product data sheet
Rev. 3 — 26 August 2013
3 of 48
NXP Semiconductors
PCF8564A
Real time clock and calendar
7. Pinning information
7.1 Pinning
Viewed from active side. For mechanical details, see
Figure 27
and
Figure 28.
Fig 2.
Pinning diagram of PCF8564A
7.2 Pin description
Table 4.
Pin description
Input or input/output pins must always be at a defined level (V
SS
or V
DD
) unless otherwise specified.
Symbol
OSCI
OSCO
INT
V
SS
SDA
SCL
CLKOUT
V
DD
CLKOE
[1]
Pin
1
2
3
4
5
6
7
8
9
Description
oscillator input
oscillator output
interrupt output, open-drain, active LOW
ground
[1]
serial data input and output
serial clock input
clock output, push-pull
supply voltage
CLKOUT enable input
The substrate (rear side of the die) is at V
SS
potential and must not be connected.
PCF8564A
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2013. All rights reserved.
Product data sheet
Rev. 3 — 26 August 2013
4 of 48
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 I
2
C-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
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2013. All rights reserved.
Product data sheet
Rev. 3 — 26 August 2013
5 of 48
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