Battery Management System (BMS) devices are pushing the boundary of ATE, requiring greater accuracy, higher voltage, and high site counts. The typical approach to testing requires more VI channels than can fit in a tester. DIB application hardware, like a resistor ladder, can help alleviate tester resources and increase site count. Though it has proven helpful, there are challenges with device loading, noise, and drift. Teradyne has developed an application module that addresses these challenges.

The Battery Management Extension (BMX) module plays two key roles in BMS applications:
1. High precision floating low noise stacked voltage reference with extremely low thermal drift.
2. Higher density (site count), low-cost test solutions due to resources that are freed up by the BMX Module.

In this presentation we will review applications that use the BMX and review best practices for its implementation. We will also review the performance of the BMX in actual applications over time and temperature.