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CHESTER-X1

This article describes the CHESTER-X1 extension module.


Module Overview​

CHESTER-X1 provides 8 independent 1-Wire channels for connecting digital sensors (e.g. Dallas DS18B20) or any other 1-Wire peripherals. The module implements the Maxim DS2482S-800+ interface and also a 5V boost converter to support 5V 1-Wire peripherals.

CHESTER Pin Configuration Diagram​

CHESTER-X1 terminal block pinout: pins 1-8 map to 1-Wire channels CH1-CH8

Pin Configuration and Functions​

PositionSignal NameSignal Description
1CH1Channel 1
2CH2Channel 2
3CH3Channel 3
4CH4Channel 4
5CH5Channel 5
6CH6Channel 6
7CH7Channel 7
8CH8Channel 8

1-Wire Parasitic Power Connection​

CHESTER-X1 supports connection using the parasitic powering method. In that case, only 2 wires are necessary. In the parasitic mode, the 5.0V power supply is used. The standard 3-wire connection powered from VDD supports only 3.0V peripherals. This figure shows parasitic and standard powering method:

Wiring comparison: 2-wire parasitic power with sensor VDD tied to GND versus 3-wire standard power from VDD

Schematic diagram​

A schematic diagram is useful if you program low-level hardware-related code or if you're just curious about how the system is designed.

CHESTER-X1 schematic sheet 1: DS2482S-800 1-Wire master with solder-bridge routing of IO0-IO7 to channels CH1-CH8 CHESTER-X1 schematic sheet 2: 5.76 V boost converter, 5.0 V LDO, and I2C level shifters

Module Drawing​

CHESTER-X1 board outline with edge signals: +V, GP0/A0, SDA, SCL, VDD, GND on top and CH8-CH1 on bottom