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PDF PCF85163 Data sheet ( Hoja de datos )
| Número de pieza | PCF85163 | |
| Descripción | Real-time clock and calendar | |
| Fabricantes | NXP Semiconductors | |
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PCF85163
Real-time clock and calendar
Rev. 2 — 28 July 2010
Product data sheet
1. General description
The PCF85163 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: 1.8 V to 5.5 V
Low backup current; typical 0.25 μA at VDD = 3.0 V and Tamb = 25 °C
400 kHz two-line 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
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.
1 page  
NXP Semiconductors
PCF85163
Real-time clock and calendar
8. Functional description
The PCF85163 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 (see Table 4) 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 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.
PCF85163
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 28 July 2010
© NXP B.V. 2010. All rights reserved.
5 of 43
5 Page 
NXP Semiconductors
PCF85163
Real-time clock and calendar
Table 14. 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 Century_months
Table 15. Century_months - century flag and months 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 16
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 16. Month assignments 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
PCF85163
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 28 July 2010
© NXP B.V. 2010. All rights reserved.
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