Table 4-5. Pin Description - J27 (continued)
Pin
Name
Comments
2
N/A
Unused
3
COMH_P
COM high-side positive
4
COMH_N
COM high-side negative
Isolation Options
Capacitor Only
If the user wishes to utilize the cap only method, no extra modifications need to be made to the EVM as this is
the default configuration.
Capacitor and Choke
For the cap and choke method to be implemented, the user must desolder the R144, R145, R155 and R154
resistors so that the L4 and L3 chokes are not bypassed.
Transformer
If the user would like to use the transformer to handle the daisy chain communications, desolder the following
resistors: R148, R149, R150, R151, R146, R147, R152, R153. On the underside of the EVM, populate the R122,
R123, R127, R129, R120, R121, R124, and R126 slots with 0-Ω resistors and T2 and T3 with transformers. This
will allow the signal to flow through the underside of the EVM where the transformers (T2 and T3) are located.
Connectors
12
BQ79631EVM Evaluation Module
SLUUCC3 – FEBRUARY 2021
Copyright © 2021 Texas Instruments Incorporated
