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L9961 Balancing problem.

Pavel61
Associate

Dear,

please advice me.
Balancing not working. 
Used Steval board with J13, J14 and all J5 open (disconnected) .

HS mode.
3 cells connected (C5-C4-C3) and (C2-C1-C0-GND)

Used test script:

WRITE 6 0AD8 N=10, Cell OV = 4.21632V
WRITE 7 0A33 N=10, Cell UV = 0,99552V
WRITE 8 0A0A Severe Cell UV = 0,8V, Severe Cell OV = 4.41152V
WRITE A 0AE2 N=10, VB_OV = 22,0576V
WRITE B 0A2D N=10, VB_UV = 4,392V
WRITE C 16 VB Sum Max Diff = 1,0736V (0B) 1,464V (0F) 2,14 (16)
WRITE D A000 N=10, NTC OT = 0V
WRITE E AFFF N=10, NTC UT = 3.30057V
WRITE F 1 NTC Severe OT = 3.30057V
WRITE 10 FAFA test má byt 0x13 pro 2,2 A ( 1313)
WRITE 11 00FA test persistent OVC TH 2,2 A
WRITE 9 0A05 bal_delta
WRITE 1 007C CHR DCHR Balancer
WRITE 4 1AFC Enable 3 cells, VB, & NTC measurement proud
PAUSE   Press OK to begin voltage acqusition  
WRITE 2 07FF Start acquisition. Filter times set to max - Tmeas_cycle = 150ms


Everything seems to work fine but balancing not
What am I doing wrong?
Will balancing affect charging or discharging or both?

Thaks you very much

Pavel

1 REPLY 1
Pavel61
Associate

I'll answer myself
L9961 does not balance automatically by itself. Balancing must be controlled by the MCU. The value of register (0x01) 0x007C is nonsense. It must be 0x0060.