Other Parts Discussed in Thread: EV2400
Hi,
According to Broadcom's instruction, BQ33100 needs calibration with TI's help, could you help to suggest how to do this step by step?
Thank you very much.
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Chapter 5: Gas Gauge Calibration
The gas gauge file contains board calibration data that must be generated for each ROMB design.
CAUTION! Calibration of the BQ33100 supercapacitor and the ROMB PCB design is a required step
during development.
Proper calibration is required for correct management of the supercapacitor throughout its
lifetime. Without a properly managed supercapacitor, data integrity cannot be ensured and data loss
can occur.
Without proper calibration, the supercapacitor might not have enough energy to support cache
offloads under all conditions, might prematurely reach end of life, or both. A new capacitor with a
large capacitance that successfully performs cache offloads under lab conditions can mask future
issues caused by invalid calibration values. Do not take this success as an indication of proper
behavior over the product’s lifetime.
The supercapacitor calibration process uses TI supplied hardware and software. Broadcom testing
found that on-site TI support is important for successful calibration. Contact your TI support team
to arrange on-site support during early development. Your Broadcom support team will also help with
the necessary tools and process to facilitate calibration.
The calibration is specific to the PCB design, not to the customer or controller. Every unique ROMB
PCB design must perform calibration. Therefore, every ROMB PCB design has a unique gas gauge.
Unlike previous generations, a single gas gauge does not apply to a multiple boards and Broadcom
cannot supply a proper valid gas gauge without customer interaction during development.
Calibration of the BQ33100 part can be difficult, requires attention to detail, and can be time
consuming to do correctly, particularly during the first attempt. On-site engagement with TI is
vital to a quick and successful calibration of the TI supercapacitor. Perform calibration early in
the development process. Board changes made after initial calibration invalidate the previous
calibration data. You must recalibrate after any board change.
The following equipment is required for calibration:
Battery emulator
TI Gas Gauge Evaluation Software package
TI EV2300 module
CacheVault® Power Module 05 (FBU345) supercapacitor
Modified cable assembly
Multimeter
