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PCF8563 Schematic ( PDF Datasheet ) - NXP Semiconductors

Teilenummer PCF8563
Beschreibung Real-time clock/calendar
Hersteller NXP Semiconductors
Logo NXP Semiconductors Logo 




Gesamt 30 Seiten
PCF8563 Datasheet, Funktion
PCF8563
Real-time clock/calendar
Rev. 11 — 26 October 2015
Product data sheet
1. General description
The PCF8563 is a CMOS1 Real-Time Clock (RTC) 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 a two-line bidirectional
I2C-bus. Maximum bus speed is 400 kbit/s. The register address 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
Century flag
Clock operating voltage: 1.0 V to 5.5 V at room temperature
Low backup current; typical 0.25 A at VDD = 3.0 V and Tamb = 25 C
400 kHz two-wire I2C-bus interface (at VDD = 1.8 V to 5.5 V)
Programmable clock output for peripheral devices (32.768 kHz, 1.024 kHz, 32 Hz, and
1 Hz)
Alarm and timer functions
Integrated oscillator capacitor
Internal Power-On Reset (POR)
I2C-bus slave address: read A3h and write A2h
Open-drain interrupt pin
3. Applications
Mobile telephones
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 18.






PCF8563 Datasheet, Funktion
NXP Semiconductors
PCF8563
Real-time clock/calendar
8. Functional description
The PCF8563 contains sixteen 8-bit registers with an auto-incrementing register address,
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) and calender, 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 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 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.
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 Binary Coded Decimal (BCD)
format.
When one of the RTC registers is written or read, the contents of all time counters are
frozen. Therefore, faulty writing or reading of the clock and calendar during a carry
condition is prevented.
8.1 CLKOUT output
A programmable square wave is available at the CLKOUT pin. Operation is controlled by
the register CLKOUT_control at address 0Dh. Frequencies of 32.768 kHz (default),
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 an open-drain
output and enabled at power-on. If disabled it becomes high-impedance.
8.2 Register organization
Table 4. Formatted registers overview
Bit positions labelled as x are not relevant. Bit positions labelled with N should always be written with logic 0; if read they
could be either logic 0 or logic 1. After reset, all registers are set according to Table 27.
Address Register name Bit
76543210
Control and status registers
00h Control_status_1 TEST1 N STOP N TESTC N N N
01h Control_status_2 N N N TI_TP AF TF AIE TIE
Time and date registers
02h VL_seconds VL
SECONDS (0 to 59)
03h Minutes
x MINUTES (0 to 59)
04h Hours
x x HOURS (0 to 23)
05h Days
x x DAYS (1 to 31)
06h Weekdays
x
x
x
x
x
WEEKDAYS (0 to 6)
07h Century_months C
x
x
MONTHS (1 to 12)
08h Years
YEARS (0 to 99)
PCF8563
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 11 — 26 October 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
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PCF8563 pdf, datenblatt
NXP Semiconductors
PCF8563
Real-time clock/calendar
Table 16. Month assignments …continuedin BCD format
Month
Upper-digit Digit (unit place)
(ten’s place)
Bit 4
Bit 3
Bit 2
October
1
0
0
November
1
0
0
December
1
0
0
Bit 1
0
0
1
Bit 0
0
1
0
8.4.7 Register Years
Table 17. Years - years register (08h) bit description
Bit Symbol
Value Place value Description
7 to 4 YEARS
0 to 9
ten’s place actual year coded in BCD format[1]
3 to 0
0 to 9
unit place
[1] When the register Years overflows from 99 to 00, the century bit C in the register Century_months is
toggled.
8.5 Setting and reading the time
Figure 7 shows the data flow and data dependencies starting from the 1 Hz clock tick.
PCF8563
Product data sheet
1 Hz tick
SECONDS
MINUTES
LEAP YEAR
CALCULATION
HOURS
DAYS
WEEKDAY
MONTHS
YEARS
C 013aaa092
Fig 7. Data flow for the time function
During read/write operations, the time counting circuits (memory locations 02h through
08h) are blocked.
This prevents
Faulty reading of the clock and calendar during a carry condition
Incrementing the time registers, during the read cycle
All information provided in this document is subject to legal disclaimers.
Rev. 11 — 26 October 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
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