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NXP Semiconductors Electronic Components Datasheet

PCA2125 Datasheet

SPI Real-time clock/calendar

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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


NXP Semiconductors Electronic Components Datasheet

PCA2125 Datasheet

SPI Real-time clock/calendar

No Preview Available !

NXP Semiconductors
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.
2 of 36


Part Number PCA2125
Description SPI Real-time clock/calendar
Maker NXP Semiconductors
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PCA2125 Datasheet PDF






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