Datasheet

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PmodRTCC™ Reference Manual
Revised May 24, 2016
This manual applies to the PmodRTCC rev. A
DOC#: 502-218
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
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Overview
The PmodRTCC is a real-time clock/calendar powered by the Microchip
®
MCP79410. Through the I
2
C interface,
users may configure up to two alarms that can be triggered at a wide variety of possible times.
1 Functional Description
The PmodRTCC can communicate using I
2
C via the 8-pin header J2. Digilent boards implement several different I
2
C
interfaces.
2 Interfacing with the Pmod
All communications with the device must specify whether to write to the EEPROM or the RTCC registers/SRAM, as
well as a register address and a flag indicating whether the communication is a read or a write. This is followed by
the actual data transfer.
The PmodRTCC responds to two I
2
C addresses. Address ‘1010111’ is used for access to the EEPROM, and address
‘1101111’ is used for access to RTCC registers/SRAM.
The PmodRTCC.
 Real-time clock/calendar with lithium coin
cell back-up
 Multi-function pin output that can
generate a square wave
 Two available alarms
 128 bytes EEPROM
 64 bytes SRAM
 Small PCB size for flexible designs 1.3“ ×
0.8” (3.3 cm × 2.0 cm)
 2×4-pin connector with I2C interface
 Follows Digilent Pmod Interface
Specification
 Library and example code available
in resource center
Features include: