UM10699
User manual for SPI-bus RTC demoboard OM11059
Rev. 1 — 04 April 2013
User manual
Document information
Info
Content
Keywords
Abstract
PCF86063BTL, OM11059, demoboard, how to get started, SPI-bus,
RTC, Real-Time Clock, tuning
User manual for the RTC SPI-bus demoboard OM11059 which contains
PCF85063BTL
NXP Semiconductors
UM10699
User manual for SPI-bus RTC demoboard OM11059
Revision history
Rev
Date
v.1
20130404
Description
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
UM10699
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2013. All rights reserved.
User manual
Rev. 1 — 04 April 2013
2 of 12
NXP Semiconductors
UM10699
User manual for SPI-bus RTC demoboard OM11059
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 OM11059 is the ideal evaluation/demo board to use in the design phase of any
project, just power and SPI-bus must be hooked up.
A separate demoboard and a user manual are available for the I
2
C-bus RTCs
PCF85063ATL and PCF85063TP: OM11059A and UM10698.
2. Key features
The RTC PCF85063BTL with SPI-bus is mounted together with a quartz crystal and the
blocking capacitor, buffering the supply voltage.
2.1 PCF85063BTL
The RTC PCF85063BTL 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
SPI-bus, up to 8 MHz
1 Byte
HXSON10 package: 2.6 x 2.6 x 0.5 mm
Alarm control
Clock out: enabled by pin or by software
Fig 1.
UM10699
Block diagram of the PCF85063BTL RTC
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2013. All rights reserved.
User manual
Rev. 1 — 04 April 2013
3 of 12
NXP Semiconductors
UM10699
User manual for SPI-bus RTC demoboard OM11059
3. Hardware set-up
3.1 General requirements for the RTC PCF85063BTL
The RTC circuit just requires one external part: 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 uses a three-line standard SPI protocol: chip enable, serial clock, serial
data I/O operating up to 8 MHz.
Supply voltage: The RTC is specified from 1.8 V to 5.5 V. The RTC, excluding the SPI-
bus interface, is however operating down to a lower voltage. 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 2.
Interfacing to microcontroller
UM10699
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2013. All rights reserved.
User manual
Rev. 1 — 04 April 2013
4 of 12
NXP Semiconductors
UM10699
User manual for SPI-bus RTC demoboard OM11059
3.2 Demo board OM11059A
Fig 3.
Picture and layout of demo bard OM11059
The OM11059 allows to easily demonstrating operation of the PCF85063BTL with SPI-
bus interface. No need to solder the tiny package to a breadboard 100 mil connector for
straight forward connections.
There are quartzes on the market with different load capacitance C
L
. 12.5 pF is most
common, 7 pF offers however lower power consumption. By default a quartz with 7 pF is
mounted. Additional landing pads are available on the board to take a quartz in a tubular
package.
Straight forward interfacing:
- Connect supply voltage (e.g. 3.3 V): VSS to pin 1, VDD to pin 2
- Connect SPI-bus: CE to pin 4, SCL to pin 3, SDI/O to pin 7
- Communicate to the RTC
Fig 4.
OM11059 block diagram
UM10699
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2013. All rights reserved.
User manual
Rev. 1 — 04 April 2013
5 of 12
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