UM10698
User manual for I2C-bus RTC demo board OM11059A
Rev. 4 — 2 November 2015
User manual
Document information
Info
Content
Keywords
Abstract
PCF85063TP, PCF86063ATL, OM11059A, demoboard, how to get
started, I
2
C-bus, RTC, Real-Time Clock, tuning
User manual for the RTC I
2
C-bus demoboard OM11059A which contains
PCF85063TP and PCF85063ATL
NXP Semiconductors
UM10698
User manual for I2C-bus RTC demo board OM11059A
Revision history
Rev
Date
v.4
v.3
v.2
v.1
20151102
20140227
20130404
20130320
Description
Revised user manual
Revised user manual
Revised user manual
New user manual, first revision
Contact information
For more information, please visit:
http://www.nxp.com
For sales office addresses, please send an email to:
salesaddresses@nxp.com
UM10698
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2015. All rights reserved.
User manual
Rev. 4 — 2 November 2015
2 of 15
NXP Semiconductors
UM10698
User manual for I2C-bus RTC demo board OM11059A
1. Introduction
The PCF85063x are a family of CMOS Real-Time Clocks (RTC) and calendar optimized
for low power consumption. Different features sets are available.
The two version of OM11059A are the ideal evaluation/demo boards to use in the design
phase of any project, just power and I
2
C-bus must be hooked up.
A separate demoboard and a user manual are available for the SPI-bus RTC
PCF85063BTL: OM11059 and UM10699.
2. Key features
There are two RTC variants of the PCF85063x RTC with I
2
C-bus:
PCF85063TP
PCF85063ATL
basic functionality with I
2
C-bus interface
enhanced functionality with I
2
C-bus interface
2.1 PCF85063TP
The PCF85063TP is a Real-Time Clock with very small form factor, counting seconds,
minutes, hours, days, weekdays, months, and years.
Electronic oscillator tuning
RAM:
Package:
Interrupt:
Interface:
1 Byte
HWSON8 package: 2 x 3 x 0.5 mm
every 30 s or 60 s (e.g. for waking up the microcontroller)
400 kHz I
2
C-bus
Fig 1.
Block diagram of the PCF85063TP RTC
UM10698
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2015. All rights reserved.
User manual
Rev. 4 — 2 November 2015
3 of 15
NXP Semiconductors
UM10698
User manual for I2C-bus RTC demo board OM11059A
2.2 PCF85063ATL
The PCF85063ATL is a Real-Time Clock with very small form factor, counting seconds,
minutes, hours, days, weekdays, months, and years.
Electronic oscillator tuning
RAM:
Package:
Timer
Interrupt:
Interface:
every 30 s or 60 s, alarm, timer
400 kHz I
2
C-bus
1 Byte
HXSON10 package: 2.6 x 2.6 x 0.5 mm
Alarm control
Clock out: enabled by pin or by software
Fig 2.
Block diagram of the PCF85063ATL RTC
UM10698
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2015. All rights reserved.
User manual
Rev. 4 — 2 November 2015
4 of 15
NXP Semiconductors
UM10698
User manual for I2C-bus RTC demo board OM11059A
3. Hardware set-up
3.1 General requirements for the RTCs PCF85063TP and PCF85063ATL
The RTC circuit just requires one external part: a tuning fork quartz as resonator. The
oscillation capacitors are integrated and therefore there is no need for external
capacitors. The quartz crystal must be placed close to the RTC circuit, avoiding long
lines which may pick up noise. Avoid any tracks with high frequency signals (fast edges)
close to the RTC, quartz, or quartz interconnect.
The interface is the standard Fast Mode I
2
C-bus, operating up to 400 kHz. Adjust pull-up
values to match the required interface speed keeping them as high impedance as
possible for power system saving. Ensure that the specified minimum requirements of
the hold times t
LOW
and t
HIGH
are fulfilled.
Supply voltage: The RTC is specified from 0.9 V to 5.5 V. The I
2
C-bus interface is
specified from 1.8 V to 5.5 V. It is recommended to have a decoupling capacitor on the
VDD-VSS rails close by.
Due to the low power consumption of below 1 μW, no precautions for heat dissipations
are required.
CLKOUT can be used to measure the frequency or be used as reference for frequency
generation with a PLL.
Fig 3.
Interfacing to microcontroller
UM10698
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2015. All rights reserved.
User manual
Rev. 4 — 2 November 2015
5 of 15
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