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RTC

The RTC plugin implements a battery-backed real-time clock using the Maxim/Dallas DS3234. This has an integrated timing crystal, providing extremely accurate timekeeping requiring no external calibration.

Bare RTC circuit board

Description [size] Format
Circuit schematic [6.0KB] Adobe Acrobat PDF
PCB layout [52.9KB] Adobe Acrobat PDF

A 3v CR2032 type lithium battery is used to maintain the timekeeping in case of power failure.

Interface

The plugin is designed to interface with the Lettuce-v1 core board via an SPI header.

Component list

Below is a full list of components required to build the RTC plugin board.

ICs

ID Value Package Description
U1 DS3234 SO20 SPI RTC

Connectors

ID Type Description
J1 2x4 100mil R/A socket Core SPI socket
J2 2x4 100mil R/A socket Core DIG socket

Resistors

ID Value Package Description
R1 ? 0805 Plugin SPI ID
R2 10K 0805 RTC Interrupt pull-up

Misc

ID Value Package Description
B1 3v lithium CR2032 Backup battery
Updated on 2010-04-25 13:41:02 +0000 | Requested on 2020-10-27 11:23:43 +0000