Due Dates:

• Requirements/Considerations -

• Component Selection -

• Initial Schematic -

• Initial Layout -

• Rev. A Ordered -

• Firmware/Testing -

Description/Purpose

• Measures voltages from battery and motor and sends them to VCU. Contactor signals also run through here

Requirements

• Step-down HV outputs from battery and motor to 3.3V

Application Note

Context

Location of the board: Inside PDE

Connection List

Main

Schematics

Precharge Resistors: 3 parallel 330 ohm resistors with a fourth DNP included just in case.

Voltage Divider: Takes the 120V signals and steps them down to the 3.3V range.

Isolating Amplifiers: Passes the signals from HV side to LV side of the board. Also applies a gain of 0.4.

Subtracting Amplifiers: Subtracts positive and negative from isolating amplifiers before applying a gain of 2.5 to counteract the isolating amplifier gain.

0.8V Reference Circuit (N/A): Was removed after discovering that shorting the negative output terminal on the isolating amplifiers to ground changed the intended 0.4 gain to 0.2. Also in part due to the TLV9001BDVR having clipping at around 2.4V for some reason.

Circuit Components

Layout

Github link:

PCB:

3D Model

Firmware

Drivers

High-Level (Block Diagram)