I2C module for RCBus systems.
Version 1.1 (5V only)
Version 1.2 (5V & 3.3V)
| Position | Description |
|---|---|
| 1-2 (default) | from bus |
| 2-3 | from oscillator |
| Position | Description |
|---|---|
| 1-2 | I/O address: 0x40 |
| 3-4 | I/O address: 0x48 |
| 5-6 | I/O address: 0x50 |
| 7-8 | I/O address: 0x58 |
| Position | Description |
|---|---|
| 1-2 | /INT |
| 2-3 | /IRQB |
| open | interrupt not use |
| 1 | 2 | 3 | 4 | 5 | 6 |
|---|---|---|---|---|---|
| GND | +5V | SDA | SCL | +5V | GND |
The connector is compatible with SC400 series I2C bus modules.
| 1 | 2 | 3 | 4 |
|---|---|---|---|
| GND | +5V | SCL | SDA |
The connector allows the connection of a 0.96" OLED display.
NOTE: Two different models of these displays are available, differing in the way they are powered. Connecting the wrong model will damage it!
| 1 | 2 | 3 | 4 |
|---|---|---|---|
| +3.3V | GND | SDA | SCL |
| Component type | Reference | Description | Quantity |
|---|---|---|---|
| PCB | I2C Module - Version 1.2 | 1 | |
| Integrated Circuit | U1 | PCF8584, 20 pin DIP | 1 |
| Integrated Circuit | U2 | 74HCT138 - 3-to-8 line decoder, 16 pin DIP | 1 |
| Integrated Circuit | U3 | 74HCT32 - Quad 2-input OR gate, 14 pin DIP | 1 |
| Integrated Circuit | U4 | DS1307 - RTC, 8 pin DIP | 1 |
| Integrated Circuit | U5 | 24C02-64 - EEPROM, 8 pin DIP | 1 |
| Integrated Circuit | U6* | AP1117-33 - low dropout positive regulator 3V3, SMD SOT-223-3 | 1 |
| Transistor | Q1*,Q2* | 2N7002, SMD SOT-23 | 2 |
| Resistor | R1,R2 | 4.7 kohm, 0.25 W, axial | 2 |
| Resistor | R3*,R4* | 4.7 kohm, SMD 0805 | 2 |
| Capacitor | C1 - C4 | 0.1 uF, 50V, MLCC, 2.5 mm pitch | 4 |
| Capacitor | C5*,C6* | 10uF, ceramic, SMD 0805 | 2 |
| Crystal | Y1 | 32768 Hz crystal | 1 |
| Oscillator | X1** | 12 MHz, CMOS oscillator, half can | 1 |
| Connector | S1 | 2x40 pin header, 2.54 mm pitch, angle | 1 |
| Pin Header | J1 | 6 pin header, 2.54 mm pitch, angle | 1 |
| Pin Socket | J2 | 4 pin socket, 2.54mm pitch | 1 |
| Pin Header | J3 | 4 pin header, 2.54 mm pitch, angle | |
| Pin Header | JP1, JP3 | 3 pin header, 2.54 mm pitch | 2 |
| Pin Header | JP2 | 2x4 pin header, 2.54 mm pitch | 1 |
| Battery Holder | BT1 | Battery Holder CR2032 | 1 |
| IC Socket | U1 | 20 pin DIP | 1 |
| IC Socket | U2 | 16 pin DIP | 1 |
| IC Socket | U3 | 14 pin DIP | 1 |
| IC Socket | U4 - U8 | 8 pin DIP | 2 |
| IC Socket | X1 | 4 pin DIP for oscillator | 1 |
Gerber files prepared for production at JLCPCB
(*) Not available in version 1.1, for version 1.2 it is optional.
(**) Quartz oscillator is required for systems with a system clock greater than 12MHz.
Version 1.1 (5V only) & 1.2 (5V/3v3)
- Initial public version
Copyright 2025 Tadeusz Pycio
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) .