Datasheet

1. General description
The PCF85063A is a CMOS
1
Real-Time Clock (RTC) and calendar optimized for low
power consumption. An offset register allows fine-tuning of the clock. All addresses and
data are transferred serially via the two-line bidirectional I
2
C-bus. Maximum data rate is
400 kbit/s. The register address is incremented automatically after each written or read
data byte.
For a selection of NXP Real-Time Clocks, see Table 45 on page 56
2. Features and benefits
 Provides year, month, day, weekday, hours, minutes, and seconds based on a
32.768 kHz quartz crystal
 Clock operating voltage: 0.9 V to 5.5 V
 Low current; typical 0.22 Aat V
DD
= 3.3 V and T
amb
=25C
 400 kHz two-line I
2
C-bus interface (at V
DD
= 1.8 V to 5.5 V)
 Programmable clock output for peripheral devices (32.768 kHz, 16.384 kHz,
8.192 kHz, 4.096 kHz, 2.048 kHz, 1.024 kHz, and 1 Hz)
 Selectable integrated oscillator load capacitors for C
L
=7pF or C
L
= 12.5 pF
 Alarm function
 Countdown timer
 Minute and half minute interrupt
 Internal Power-On Reset (POR)
 Programmable offset register for frequency adjustment
3. Applications
 Digital still camera
 Digital video camera
 Printers
 Copy machines
 Mobile equipment
 Battery powered devices
PCF85063A
Tiny Real-Time Clock/calendar with alarm function and
I
2
C-bus
Rev. 4 — 24 November 2014 Product data sheet
1. The definition of the abbreviations and acronyms used in this data sheet can be found in Section 21.