InetrfaceProducts NXP / PCF2127

PCF2127 and PCF2129 are high accuracy real-time-clock (RTC) module. This library provides simple interface to accessing clock information.

Dependents:   PCF2127_Demo PCF2127_Hello

PCF2127 and PCF2129

PCF2127T PCF2127T is in SO16 package

The PCF2127 and the PCF2129 are a CMOS Real Time Clock (RTC) and calendar with an integrated Temperature Compensated Crystal (Xtal) Oscillator (TCXO) and a 32.768 kHz quartz crystal optimized for very high accuracy and very low power consumption.
Both of PCF2127 and PCF2129 have a selectable I2C-bus or SPI-bus, a backup battery switch-over circuit, a programmable watchdog function, a timestamp function, and many other features.
On addition to this, the PCF2127 has 512 bytes of general-purpose static RAM.

These 4 types of RTC modules are software compatible. So this library "PCF2127" can be used all of those.
This library only supports I2C to communicate with the PCF2127/PCF2129.

Type variations

Main feature difference

type+/-3ppm accuracy range512 bytes RAMpackage
PCF2127T-30℃ to +80℃yesSO16
PCF2127AT-30℃ to +60℃yesSO20
PCF2129T-30℃ to +80℃not availableSO16
PCF2129AT-15℃ to +60℃not availableSO20

Pin assign

/media/uploads/nxp_ip/pcf2127_pcf2129_pin_assign.png

PCF2127T
PCF2127T

Connection between MCU and PCF2127/PCF2129

These examples show how the RTC module can be connected via I2C bus.

http://developer.mbed.org/media/components/pinouts/both_types_connection3.png

References

Files at this revision

API Documentation at this revision

Revision 3:e2a6ac61fcbd, committed 2014-12-10

Comitter:
nxp_ip
Date:
Wed Dec 10 02:07:35 2014 +0000
Parent:
2:db76c68f998f
Commit message:
online document (class description) updated

Changed in this revision

PCF2127.cpp Show annotated file Show diff for this revision Revisions of this file
PCF2127.h Show annotated file Show diff for this revision Revisions of this file 
diff -r db76c68f998f -r e2a6ac61fcbd PCF2127.cpp
--- a/PCF2127.cpp	Wed Dec 10 01:43:30 2014 +0000
+++ b/PCF2127.cpp	Wed Dec 10 02:07:35 2014 +0000
@@ -2,7 +2,7 @@
  *  PCF2127 library
  *
  *  @author     Akifumi (Tedd) OKANO, NXP Semiconductors
- *  @version    1.7
+ *  @version    1.8
  *  @date       10-Dec-2014
  *
  *  PCF2127 is a "real time clock (RTC)" module which is including a Xtal and TCXO

diff -r db76c68f998f -r e2a6ac61fcbd PCF2127.h
--- a/PCF2127.h	Wed Dec 10 01:43:30 2014 +0000
+++ b/PCF2127.h	Wed Dec 10 02:07:35 2014 +0000
@@ -2,7 +2,7 @@
  *  PCF2127 library
  *
  *  @author     Akifumi (Tedd) OKANO, NXP Semiconductors
- *  @version    1.7
+ *  @version    1.8
  *  @date       10-Dec-2014
  *
  *  PCF2127 is a "real time clock (RTC)" module which is including a Xtal and TCXO
@@ -20,6 +20,39 @@
 
 #include    "mbed.h"
 
+/** PCF2127 class
+ *
+ *  This is a driver code for the PPCF2127: "real time clock (RTC)" module which is including a Xtal and TCXO
+ *  This class provides interface for PCF2127 operation and accessing its registers.
+ *  Detail information is available on next URL.
+ *    http://www.nxp.com/products/interface_and_connectivity/real_time_clocks/rtcs_with_temp_compensation/series/PCF2127.html
+ *
+ *  Example:
+ *  @code
+ *  #include "mbed.h"
+ *  #include "PCF2127.h"
+ *  
+ *  PCF2127 rtc( p28, p27 );
+ *  
+ *  int main()
+ *  {
+ *      time_t  t;
+ *      
+ *      printf( "PCF2127 demo started.\r\n" );
+ *  
+ *      if ( rtc.is_init_required() ) {
+ *          rtc.set_time( "2014 12 10 12 00 00" );
+ *      }
+ *  
+ *      while ( 1 ) {
+ *          t   = rtc.time( NULL );
+ *          printf( "%s\r", ctime( &t ) );
+ *          wait( 0.25 );
+ *      }
+ *  }
+ *  @endcode
+ */
+
 class PCF2127
 {
 public: