PCA8565
Real time clock/calendar
Rev. 4 — 5 December 2014
Product data sheet
1. General description
The PCA8565 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 address 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.
For a selection of NXP Real-Time Clocks, see
Table 36 on page 40
2. Features and benefits
AEC-Q100 compliant (PCA8565TS) for automotive applications
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 at room temperature
Extended operating temperature range:
40 C
to +125
C
Low current; typical 0.65
A
at V
DD
= 3.0 V and T
amb
= 25
C
400 kHz two-wire I
2
C-bus interface (at V
DD
= 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
I
2
C-bus slave address: read A3h and write A2h
Open-drain interrupt pin
One integrated oscillator capacitor
3. Applications
Automotive
Industrial
Other 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 22.
NXP Semiconductors
PCA8565
Real time clock/calendar
4. Ordering information
Table 1.
Ordering information
Package
Name
PCA8565TS
TSSOP8
Description
plastic thin shrink small outline package; 8 leads;
body width 3 mm
Version
SOT505-1
Type number
4.1 Ordering options
Table 2.
Ordering options
Orderable part number Sales item
(12NC)
PCA8565TS/1,118
PCA8565TS/S410/1,5
935272132118
935273247518
Delivery form
tape and reel, 13 inch
tape and reel, 13 inch, dry pack
IC
revision
1
1
Product type number
PCA8565TS/1
PCA8565TS/S410/1
5. Marking
Table 3.
Marking codes
Marking code
8565
Type number
PCA8565TS
PCA8565
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet
Rev. 4 — 5 December 2014
2 of 48
NXP Semiconductors
PCA8565
Real time clock/calendar
6. Block diagram
Fig 1.
Block diagram of PCA8565
PCA8565
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet
Rev. 4 — 5 December 2014
3 of 48
NXP Semiconductors
PCA8565
Real time clock/calendar
7. Pinning information
7.1 Pinning
Top view. For mechanical details see
Figure 28.
Fig 2.
Pin configuration of PCA8565TS (TSSOP8)
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
Pin
PCA8565TS
1
2
3
4
5
6
7
8
oscillator input
oscillator output
interrupt output (open-drain; active LOW)
ground
serial data I/O
serial clock input
clock output, open-drain
positive supply voltage
Description
PCA8565
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet
Rev. 4 — 5 December 2014
4 of 48
NXP Semiconductors
PCA8565
Real time clock/calendar
8. Functional description
The PCA8565 contains sixteen 8-bit registers with an auto-incrementing address register,
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), a programmable clock output, a
timer, an alarm, a voltage-low detector and a 400 kHz I
2
C-bus interface.
All 16 registers are designed as addressable 8-bit registers although not all bits are
implemented:
•
The first two registers (memory address 00h and 01h) are used as control and status
registers
•
The registers at 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
•
The register at address 0Dh controls the CLKOUT output frequency
•
At address 0Eh is the timer control register and address 0Fh contains the timer value
The arrays SECONDS, MINUTES, HOURS, DAYS, WEEKDAYS, MONTHS, YEARS as
well as the bit fields MINUTE_ALARM, HOUR_ALARM, DAY_ALARM and
WEEKDAY_ALARM 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. This prevents faulty writing or reading of the clock or calendar during a carry
condition (see
Section 9.5.3).
PCA8565
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet
Rev. 4 — 5 December 2014
5 of 48
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