PCA2125 Datasheet PDF - NXP Semiconductors


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PCA2125
NXP Semiconductors

Part Number PCA2125
Description SPI Real-time clock/calendar
Page 30 Pages

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PCA2125
SPI Real-time clock/calendar
Rev. 01 — 28 July 2008
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Product data sheet
1. General description
The PCA2125 is a CMOS real-time clock/calendar optimized for low-power consumption
and an operating temperature up to 125 °C. Data is transferred via a Serial Peripheral
Interface (SPI) bus with a maximum data rate of 6.0 Mbit/s. An alarm and timer function
are also available with the possibility to generate a wake-up signal on an interrupt pin.
AEC Q100 qualified for automotive applications.
2. Features
I Provides year, month, day, weekday, hours, minutes and seconds based on
32.768 kHz quartz crystal
I Resolution: seconds to years
I Clock operating voltage: 1.3 V to 5.5 V
I Low backup current: typical 0.55 µA at VDD = 3.0 V and Tamb = 25 °C
I 3-line SPI-bus with separate combinable data input and output
I Serial interface (at VDD = 1.6 V to 5.5 V)
I 1 second or 1 minute interrupt output
I Freely programmable timer with interrupt capability
I Freely programmable alarm function with interrupt capability
I Integrated oscillator capacitor
I Internal power-on reset
I Open-drain interrupt pin
3. Applications
I Automotive time keeping application
I Metering
4. Ordering information
Table 1. Ordering information
Type number Package
Name
Description
PCA2125TS
TSSOP14 plastic thin shrink small outline package; 14 leads;
body width 4.4 mm
Version
SOT402-1



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5. Marking
Table 2. Marking codes
Type number
PCA2125TS
6. Block diagram
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PCA2125
SPI Real-time clock/calendar
Marking code
PCA2125
OSCI
OSCO
VDD
VSS
SDO
SDI
SCL
CE
OSCILLATOR DIVIDER
32.768 kHz
MONITOR
POWER-ON
RESET
WATCH-
DOG
SPI
INTERFACE
PCA2125
CONTROL
00h Control_1
01h Control_2
0Dh CLKOUT_control
TIME
02h Seconds
03h Minutes
04h Hours
05h Days
06h Weekdays
07h Months
08h Years
ALARM FUNCTION
09h Minute_alarm
0Ah Hour_alarm
0Bh Day_alarm
0Ch Weekday_alarm
TIMER FUNCTION
0Eh Timer_control
0Fh Countdown_timer
Fig 1. Block diagram of PCA2125
CLOCK OUT
CLKOUT
INTERRUPT
INT
001aah664
PCA2125_1
Product data sheet
Rev. 01 — 28 July 2008
© NXP B.V. 2008. All rights reserved.
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7. Pinning information
7.1 Pinning
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PCA2125
SPI Real-time clock/calendar
OSCI 1
OSCO 2
n.c. 3
n.c. 4
INT 5
CE 6
VSS 7
PCA2125
14 VDD
13 CLKOUT
12 n.c.
11 n.c.
10 SCL
9 SDI
8 SDO
001aaf892
Fig 2. Pin configuration for TSSOP14
7.2 Pin description
Table 3.
Symbol
OSCI
OSCO
n.c.
INT
CE
VSS
SDO
SDI
SCL
n.c.
CLKOUT
VDD
Pin description
Pin Description
1 oscillator input
2 oscillator output
3, 4 not connected; do not connect and do not use as feed through; connect
to VDD if floating pins are not allowed
5 interrupt output (open-drain; active LOW)
6 chip enable input (active HIGH) with 200 kpull-down resistor
7 ground
8 serial data output, push-pull
9 serial data input; might float when CE inactive
10 serial clock input; might float when CE inactive
11, 12
13
not connected; do not connect and do not use as feed through; connect
to VDD if floating pins are not allowed
clock output (open-drain)
14 supply voltage
8. Functional description
The PCA2125 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,
and a 6 MHz SPI-bus.
All sixteen registers are designed as addressable 8-bit parallel registers although not all
bits are implemented:
PCA2125_1
Product data sheet
Rev. 01 — 28 July 2008
© NXP B.V. 2008. All rights reserved.
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PCA2125
SPI Real-time clock/calendar
The first two registers at addresses 00h and 01h (Control_1 and Control_2) are used
as control registers.
Registers at addresses 02h to 08h (Seconds, Minutes, Hours, Days, Weekdays,
Months, Years) are used as counters for the clock function. Seconds, minutes, hours,
days, months and years are all coded in Binary Coded Decimal (BCD) format. When
one of the RTC registers is read the contents of all counters are frozen. Therefore,
faulty reading of the clock/calendar during a carry condition is prevented.
Registers at addresses 09h to 0Ch (Minute_alarm, Hour_alarm, Day_alarm,
Weekday_alarm) define the alarm condition.
Register at address 0Dh (CLKOUT_control) defines the clock out mode.
Registers at addresses 0Eh and 0Fh (Timer_control and Countdown_timer) are used
for the countdown timer function. The countdown timer has four selectable source
clocks allowing for countdown periods in the range from less than 1 ms to more than 4
hours. There are also two pre-defined timers which can be used to generate an
interrupt once per second or once per minute. These are defined in register Control_2
(01h).
8.1 Register overview
The time registers are encoded in BCD to simplify application use. Other registers are
either bit-wise or standard binary.
Table 4. Register overview
Bits labeled ‘-’ are not implemented and will return a logic 0 when read. Bit positions labeled ‘0’ should always be written with
logic 0.
Address Register name
Bit
7 65
4
3 210
00h Control_1
EXT_TEST 0 STOP
0
POR_OVRD 12_24 0
0
01h Control_2
MI SI MSF
TI_TP
AF TF AIE TIE
02h Seconds
RF
SECONDS[1]
SECONDS
03h Minutes
-
MINUTES[1]
MINUTES
04h Hours
-
- AMPM
HOURS[1]
HOURS
--
HOURS[2]
HOURS
05h Days
--
DAYS[1]
DAYS
06h Weekdays
- --
-
- WEEKDAYS
07h Months
-
--
MONTHS[1]
MONTHS
08h Years
YEARS[1]
YEARS
09h Minute_alarm
AEN_M
MINUTE_ALARM[1]
MINUTE_ALARM
0Ah Hour_alarm
AEN_H
- AMPM HOUR_ALARM[1]
HOUR_ALARM
- HOUR_ALARM[2]
HOUR_ALARM
0Bh Day_alarm
AEN_D
-
DAY_ALARM[1]
DAY_ALARM
0Ch Weekday_alarm AEN_W
-
-
-
- WEEKDAY_ALARM
0Dh CLKOUT_control
-
--
-
-
COF
0Eh Timer_control
TE - -
-
- - CTD
0Fh Countdown_timer
COUNTDOWN_TIMER
[1] Ten’s place.
PCA2125_1
Product data sheet
Rev. 01 — 28 July 2008
© NXP B.V. 2008. All rights reserved.
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