PCA8565A
Real-time clock/calendar
Rev. 02 — 4 December 2009
Product data sheet
1. General description
The PCA8565A is a CMOS
1
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
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.
AEC-Q100 compliant for automotive applications.
2. Features
I
Provides year, month, day, weekday, hours, minutes, and seconds based on
32.768 kHz quartz crystal
I
Clock operating voltage: 1.8 V to 5.5 V
I
Extended operating temperature range:
−40 °C
to +125
°C
I
Low backup current: typical 0.65
µA
at V
DD
= 3.0 V and T
amb
= 25
°C
I
400 kHz two-line I
2
C-bus interface (at V
DD
= 1.8 V to 5.5 V)
I
Programmable clock output for peripheral devices (32.768 kHz, 1.024 kHz, 32 Hz, and
1 Hz)
I
Alarm and timer functions
I
Two integrated oscillator capacitors
I
Internal Power-On Reset (POR)
I
I
2
C-bus slave address: read A3h; write A2h
I
Open-drain interrupt pin
I
Century flag
3. Applications
I
Automotive
I
Industrial
I
Applications that require a wide operating temperature range
1.
The definition of the abbreviations and acronyms used in this data sheet can be found in
Section 18.
NXP Semiconductors
PCA8565A
Real-time clock/calendar
4. Ordering information
Table 1.
Ordering information
Package
Name
Die type 1
[1]
PCA8565AU/5BA/1
Die type 2
PCA8565AU/5BB/1
[1]
Type number
Description
wire bond die;
9 bonding pads
wire bond die;
9 bonding pads
Delivery form
unsawn wafer;
thickness 280
µm
unsawn wafer;
thickness 280
µm
Version
PCA8565AU
PCA8565AU
PCA8565AU
PCA8565AU
Not to be used for new designs.
5. Marking
Table 2.
Marking codes
Marking code
PC8565A-1
PC8565A-1
Type number
PCA8565AU/5BA/1
PCA8565AU/5BB/1
PCA8565A_2
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 02 — 4 December 2009
2 of 38
NXP Semiconductors
PCA8565A
Real-time clock/calendar
6. Block diagram
OSCI
COSCI
CLKOE
OSCILLATOR
32.768 kHz
DIVIDER
CLOCK OUT
CLKOUT
OSCO
COSCO
MONITOR
00
01
0D
POWER ON
RESET
CONTROL
CONTROL_STATUS_1
CONTROL_STATUS_2
CLKOUT_CONTROL
TIME
02
03
V
DD
V
SS
04
05
06
07
WATCH
DOG
08
VL_SECONDS
MINUTES
HOURS
DAYS
WEEKDAYS
CENTURY_MONTHS
YEARS
ALARM FUNCTION
09
0A
SDA
SCL
I
2
C-BUS
INTERFACE
0B
0C
MINUTE_ALARM
HOUR_ALARM
DAY_ALARM
WEEKDAY_ALARM
INTERRUPT
TIMER FUNCTION
INT
PCA8565A
0E
0F
TIMER_CONTROL
TIMER
001aah662
Fig 1.
Block diagram of PCA8565A
PCA8565A_2
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 02 — 4 December 2009
3 of 38
NXP Semiconductors
PCA8565A
Real-time clock/calendar
7. Pinning information
7.1 Pinning
OSCI
OSCO
1
2
9
CLKOE
8
y
7
0,0
x
6
V
DD
CLKOUT
SCL
INT
3
PCA8565A
5
SDA
V
SS
4
013aaa216
Viewed from active side. For mechanical details, see
Figure 22.
Fig 2.
Pin configuration for PCA8565A
7.2 Pin description
Table 3.
Symbol
OSCI
OSCO
INT
V
SS
SDA
SCL
CLKOUT
V
DD
CLKOE
[1]
Pin description
Pin
1
2
3
4
5
6
7
8
9
Description
oscillator input
oscillator output
interrupt output (open-drain; active LOW)
ground supply voltage
[1]
serial data input and output
serial clock input
clock output (open-drain)
supply voltage
CLKOUT output enable input
The substrate (rear side of the die) is wired to V
SS
but should not be electrically contacted.
PCA8565A_2
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 02 — 4 December 2009
4 of 38
NXP Semiconductors
PCA8565A
Real-time clock/calendar
8. Functional description
The PCA8565A contains 16 8-bit registers with an auto-incrementing address register, an
on-chip 32.768 kHz oscillator with two integrated capacitors, a frequency divider which
provides the source clock for the RTC, a programmable clock output, a timer, an alarm, a
voltage low detector, and a 400 kHz I
2
C-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 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, weekdays, months, years, as well as the minute
alarm, hour alarm, day alarm, and weekday alarm registers are all in Binary Coded
Decimal (BCD) format.
When one of the RTC registers is read, the contents of all time counters are frozen.
Therefore, faulty 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. 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 an open-drain
output, and if disabled it becomes high-impedance.
PCA8565A_2
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 02 — 4 December 2009
5 of 38
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