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Original question:

BQ27426: self-learning condition for BQ27426

BQ27426: Self learning conditon and test result

chengxiaobin
Intellectual 300 points
Part Number: BQ27426

我们查看放电log发现Ra更新的时间和芯片手册不符

芯片手册中的描述为：Ra table 在放电过程中更新。

实验一（循环执行"放电6%(0.2C) + 静置2小时"），没有同步到寄存器，还是尚未更新呢？

实验二（循环执行"放电12%(0.2C) + 静置2小时"），在第四次放电时Ra更新。请问前三次放电Ra为什么不更新呢？

Fullscreen 0336.prepp_fs.txt Download 
W: AA 00 01 00 
C: AA 00 26 04 
W: AA 00 02 00 
C: AA 00 02 02 
W: AA 00 13 00 
X: 1100 
W: AA 3E 02 00 
W: AA 40 02 26 00 00 32 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
W: AA 60 A5 
X: 10 
W: AA 3E 02 00 
C: AA 60 A5 
W: AA 3E 24 00 
W: AA 40 00 19 28 63 5F FF 62 00 32 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
W: AA 60 69 
X: 10 
W: AA 3E 24 00 
C: AA 60 69 
W: AA 3E 31 00 
W: AA 40 0A 0F 02 05 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
W: AA 60 DF 
X: 10 
W: AA 3E 31 00 
C: AA 60 DF 
W: AA 3E 40 00 
W: AA 40 64 7A 0F 9F 23 00 00 14 04 00 09 04 26 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
W: AA 60 05 
X: 10 
W: AA 3E 40 00 
C: AA 60 05 
W: AA 3E 44 00 
W: AA 40 00 32 01 C2 30 00 03 08 98 01 00 3C 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
W: AA 60 F9 
X: 10 
W: AA 3E 44 00 
C: AA 60 F9 
W: AA 3E 50 00 
W: AA 40 01 F4 00 1E C8 14 08 00 3C 0E 10 00 0A 46 05 14 05 0F 03 20 7F FF 00 F0 46 50 18 01 90 00 64 19 
W: AA 60 E4 
X: 10 
W: AA 3E 50 00 
C: AA 60 E4 
W: AA 3E 50 01 
W: AA 40 DC 5C 60 00 7D 00 04 03 19 25 0F 14 0A 78 60 28 01 F4 00 00 00 00 43 80 04 01 14 00 08 0B B8 01 
W: AA 60 DB 
X: 10 
W: AA 3E 50 01 
C: AA 60 DB 
W: AA 3E 50 02 
W: AA 40 2C 0A 01 0A 00 00 00 C8 00 64 02 00 00 00 00 07 D0 01 03 5A 02 00 00 00 00 00 00 00 00 00 00 00 
W: AA 60 59 
X: 10 
W: AA 3E 50 02 
C: AA 60 59 
W: AA 3E 51 00 
W: AA 40 03 34 00 CD 04 CE 00 3C 3C 01 B3 B3 01 90 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
W: AA 60 B9 
X: 10 
W: AA 3E 51 00 
C: AA 60 B9 
W: AA 3E 52 00 
W: AA 40 41 B8 00 01 5E 81 04 CE 12 7F 0B B8 00 C8 00 32 00 14 03 E8 01 00 31 00 0A FF CE FF CD 00 02 00 
W: AA 60 30 
X: 10 
W: AA 3E 52 00 
C: AA 60 30 
W: AA 3E 53 00 
W: AA 40 23 89 11 25 E5 E5 E1 E2 E1 E2 E3 E3 E3 E5 EA E0 DB EB EB DE E8 EA EE F1 F4 F4 F6 F6 F9 FA F8 FC 
W: AA 60 7A 
X: 10 
W: AA 3E 53 00 
C: AA 60 7A 
W: AA 3E 53 01 
W: AA 40 F7 F6 F7 F3 F0 EF FC FC FC E2 AB 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
W: AA 60 C8 
X: 10 
W: AA 3E 53 01 
C: AA 60 C8 
W: AA 3E 54 00 
W: AA 40 01 1B 04 FD F9 03 00 00 00 F6 FF FC 00 E5 13 3B F5 F4 0B EF 00 00 00 F6 00 FB FD F6 F1 F0 CF E9 
W: AA 60 62 
X: 10 
W: AA 3E 54 00 
C: AA 60 62 
W: AA 3E 54 01 
W: AA 40 F4 03 07 0A FA FE 04 F0 46 81 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
W: AA 60 44 
X: 10 
W: AA 3E 54 01 
C: AA 60 44 
W: AA 3E 55 00 
W: AA 40 FF 8F 00 27 05 F6 0D 16 F4 0C 05 00 F6 0A E8 E5 E3 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
W: AA 60 77 
X: 10 
W: AA 3E 55 00 
C: AA 60 77 
W: AA 3E 6C 00 
W: AA 40 FE C2 00 12 0B 16 08 EB 0B CB 01 F8 02 F3 38 31 F8 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
W: AA 60 F4 
X: 10 
W: AA 3E 6C 00 
C: AA 60 F4 
W: AA 3E 59 00 
W: AA 40 00 36 00 38 00 3C 00 43 00 38 00 36 00 3E 00 36 00 38 00 3B 00 3D 00 40 00 5F 00 8F 00 AB 00 00 
W: AA 60 A7 
X: 10 
W: AA 3E 59 00 
C: AA 60 A7 
W: AA 3E 6D 00 
W: AA 40 05 03 0E DB 0E 5F 10 9C 10 9A 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
W: AA 60 4B 
X: 10 
W: AA 3E 6D 00 
C: AA 60 4B 
W: AA 3E 68 00 
W: AA 40 01 00 00 00 D4 86 4A C6 B4 C2 6E 2B 03 7C 01 48 FD A3 F6 75 12 58 2D B7 00 00 00 00 CB D4 1A 05 
W: AA 60 A6 
X: 10 
W: AA 3E 68 00 
C: AA 60 A6 
W: AA 3E 68 01 
W: AA 40 1C 98 02 D3 FF B9 30 EF 05 11 05 01 00 00 10 01 00 3C 00 50 3C 00 64 3C 00 20 00 00 00 00 00 00 
W: AA 60 EA 
X: 10 
W: AA 3E 68 01 
C: AA 60 EA 
W: AA 3E 69 00 
W: AA 40 00 01 0B C6 7E 77 E1 B9 93 0D 04 65 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
W: AA 60 95 
X: 10 
W: AA 3E 69 00 
C: AA 60 95 
W: AA 3E 6B 00 
W: AA 40 EF 05 11 05 01 00 00 10 01 00 3C 00 50 3C 00 64 3C 00 20 00 00 00 00 00 00 00 00 00 00 00 00 00 
W: AA 60 5B 
X: 10 
W: AA 3E 6B 00 
C: AA 60 5B 
W: AA 3E 70 00 
W: AA 40 80 00 80 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
W: AA 60 FF 
X: 10 
W: AA 3E 70 00 
C: AA 60 FF 
W: AA 00 00 00 
W: AA 00 42 00 
X: 2000
learn.zip

We checked the discharge log and found that the Ra update time did not match the chip manual

The description in the chip manual says that the Ra table is updated during the discharge process.

Experiment 1 (cyclic execution of "discharge 6% (0.2C) + 2 hours of rest") is not synchronized to the register, or is it not updated yet?

Experiment 2 (cycling "discharge 12% (0.2C) + 2 hours of rest"), Ra was updated on the fourth discharge. Why was Ra not updated on the first three discharges?