hi
I have built a circuit based on BQ51050B with 75mAh li-ion battery for charging and so my R1 = 4.2k, Rfod = 200ohm (where Ibulk = 68mA which will be around 0.9C charging) and its working fine.
I also have set the Rterm = 2.4K (Rterm or R5)(as per the data sheet when the battery charging current comes less than 10% of 68mA that is 6.8mA bq51050b will send a CS100 command to transmitter, so that we can see a stable LED indication on transmitter side, which is a BQ500410AEVM-085). i have connected a multimeter across the battery to monitor the current flow into the battery. in my case at the time of full charge state my battery consumes approximately 3.5mA and still I cant able to see any charge full status on the transmitter side.
Please do correct me if you find any mistake in the above procedure that i have followed in order to get charge full status indication. please let me know if you need any further information about the project.
Note:
1. The Ros resistance in the data sheet (which connects RECT and Rfod) is letf open in my circuit. (please do let me know what this resistance do and is it necessary to put a resister there)
2. Placed 10k for TS pin. (since I didnt use any NTC as for now).