RTC Board Assembly (DIY)

sorgelig edited this page Mar 6, 2018 · 5 revisions

The following section will walk you through the steps of creating your own Mister RTC Board. It describes where to order all necessary parts like PCB and components. It will also give you an overview on the equipment you need and show you how to assemble the board.

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1. Order PCB

Approved PCB Manufactors

PCB Layout (Gerber Files)

Check the MiSTer hardware repository for the most recent PCB files: MiSTer_Hardware


2. Order Components

This is a general overview of the components, including reference parts that were successfully used to assemble a MiSTer RTC Board version 1.2.

General Components:

The components in this table are the general components. You will have to choose additionally a RTC chip and crystal combination from the next table

Name Component Package Value Reference Parts
C1 Capacitor (Ceramic) 0805 10uF KEMET
C0805C106K8PACTU
R1, R2 Resistor 1% 1/8W 0805 4.7K Yageo
RC0805FR-074K7L
B1 Coin Cell Holder for CR1220 12mm - MPD
BK-885
P1 GPIO Connector 2mm 18 Pin Amphenol
63453-118LF

RTC / Crystal Table

The RTC Chip (U1) / Crystal (X1) combination in this table are approved by users that successfully build a RTC Board version 1.2

Name Component Package Value Reference Parts
U1 I2C RTC Chip:
M41T81
8-SOIC - ST
M41T81M6F
X1 Crystal:
32.768kHz ±20ppm, 12.5pF, 50 kOhms
Cylindrical Can - Citizen
CMR200T32768DZFT

Example of BOM on Octopart

https://octopart.com/bom-tool/95qomeBj

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