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I
2
C™ RTCC PICtail™ Daughter Board
Overview
The I
2
C™ PICtail™ daughter board is an evaluation board based around the
MCP79410 I
2
C Serial Real-Time Clock/Calendar. The board is designed to
interface with the PICtail daughter board, PICtail Plus connector and also the
PICkit™ Serial Analyzer for communication with the RTCC.
Key Features of the Board
• Follows the published recommended usage including decoupling capacitors,
pull-up/down resistors, recommended crystal layout.
• PICtail daughter board, PICtail Plus connector and PICkit Serial Analyzer
connector.
• Test points for oscilloscope connections for firmware debugging (I
2
C™ and
MFP connections).
• On-board battery connection to operate when V
CC is not present.
• Jumper to steer MFP pin to suit a range of MCU development boards.
Getting Started
The RTCC daughter board allows you to get started right out of the box. By using
the daughter board and one of the MCU development boards that support the
PICtail series of connectors, system firmware can be developed quickly using
known good hardware. Alternatively, by using the PICkit Serial Analyzer you can
read and write the serial EEPROM, SRAM and RTCC registers directly. All of the
application notes written for the MCP7941X family are designed around the RTCC
PICtail daughter board.
The installed crystal provides high accuracy at room temperature. Using the cali-
bration features of the MCP7941X, this accuracy can be improved across all tem-
peratures.
Table of Connections
The connections to the board are detailed below:
Table 1: PICtail™ Daughter Board Connections
SIGNAL
PICtail™
Daughter
Board (J1)
PICtail™ Plus (J2)
PICkit™ Serial
Analyzer (J3)
V
CC 21 + 22 26 2
GND 9 + 10 28 3
SCL 6 12 5
SDA 8 10 4
MFP 18 4 or 21 (Selectable 6
Microchip Technology Inc. • 2355 West Chandler Blvd. • Chandler, AZ 85224-6199
www.microchip.com
Information contained in this publication is provided only for your convenience and may be superseded by updates. It is
your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESEN-
TATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR
OTHERWISE, RELATED TO THE INFORMATION OR RELATED SUPPORT SERVICES, IF ANY, INCLUDING BUT NOT
LIMITED TO THEIR CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE.
Microchip disclaims all liability arising from this information and its use. Further, Microchip disclaims all liability arising from
information and support obtained from www.qwikandlow.com.
The Microchip name and logo, the Microchip logo, and PIC are registered trademarks of Microchip Technology Incorporated in
the U.S.A. and other countries. PICkit and PICtail are trademarks of Microchip Technology Incorporated in the U.S.A. and
other countries. All other trademarks mentioned herein are property of their respective companies. © 2010-2011, Microchip
Technology Incorporated, Printed in the U.S.A. All Rights Reserved. 06/11
*DS22258B * DS22258B
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