All trademarks are the property of their respective owners.
While the BQ769x2 can be configured by the host in the application, there are some advantages to configuring the device on the production line using OTP. First, pre-configuring the OTP allows you to configure important device settings that may be difficult to configure in the application. For example, if the application host relies on the BQ769x2 LDO for power or needs to select a different communication type than the default selection, it may be more practical to have these settings pre-configured in OTP so that the device powers up with the desired settings. To see which available communication type and LDO configurations are available to order pre-configured, see the device-selection table in the device-specific data sheet.
Another advantage of configuring the device on the production line is it allows the opportunity to calibrate voltage, current, and temperature measurements for the best possible accuracy. Calibration is only practical on the production line where applied voltages, current, and temperature can be tightly controlled.
The BQ769x2 has commands that support raw ADC readings to support calibration of voltage, current, and temperature readings. The following sections will outline steps required for the calibration of different measurement types, the commands and subcommands needed for each of the readings, and the RAM parameters where calibration data can be stored.
There are a few options to consider when implementing calibration in production depending on the needed accuracy and production test equipment capability and test time. Let's take cell voltage calibration as an example. Below are a few different options listed ranging from least accurate (1) to most accurate (4).