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CHESTER-X4

This article describes the CHESTER-X4 extension module.


Module Overview​

CHESTER-X4 implements a step-down DC/DC converter providing power from an external 6-28 VDC line (VIN). It also allows input voltage measurement. The module also has 4 P-MOS switches for supplying independent loads from the VIN voltage input.

Output Protection​

Each of the four outputs has a resettable PTC fuse protection (femtoSMDC005F). Each output can reliably supply 50 mA of constant current. The trip current is around 150 mA.

CHESTER Pin Configuration Diagram​

Terminal block pins 1–8 mapped to GND, CH1, CH2, CH3, CH4, GND, GND, VIN

Pin Configuration and Functions​

PositionSignal NameSignal Description
1GNDSystem ground signal
2CH1Channel 1 voltage output switch
3CH2Channel 2 voltage output switch
4CH3Channel 3 voltage output switch
5CH4Channel 4 voltage output switch
6GNDSystem ground signal
7GNDSystem ground signal
8VINDC power supply voltage input (6-28V)

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-X4 R3.1 schematic: TPS62175 step-down converter, TLA2021 ADC, and four fused P-MOS output switches

Module Drawing​

CHESTER-X4 placement drawing with slot signals on top and VIN, GND, and CH1–CH4 terminals on bottom