BQ25960: When CHG_EN is written as 1, the CFLY_SHORT_FLAY interrupt flag is triggered, and CHG_EN becomes 0

xiangyue wang

Part Number: BQ25960

Our colleagues have designed the following schematic diagram based on the suggestions of this case. https://e2echina.ti.com/support/power-management/f/power-management-forum/1010418/bq25960evm-question-about-the-schematic-diagram . But when I tried to start the charging of two bq25960 separately, the code prompted that the two bq25960 also independently generated CFLYS_SHORT_FLAY interrupts, which prevented them from starting charging normally. Please help us confirm where the problem lies.

The value of the bq25960 register at the beginning of the device startup is as follows:

pineapple:/ # cat /sys/kernel/debug/regmap/0-0065/registers
00: 5a
01: 46
02: 51
03: 50
04: 28
05: 48
06: 64
07: 64
08: 09
09: 09
0a: bc
0b: c8
0c: 15
0d: 15
0e: 24
0f: 00
10: 24
11: 71
12: 18
13: 00
14: 00
15: 22
16: 00
17: 80
18: 00
19: 00
1a: 1c
1b: 00
1c: 80
1d: 00
1e: 04
1f: 00
20: 00
21: 00
22: 08
23: 80
24: 00
25: 00
26: 00
27: 00
28: 06
29: 00
2a: 0a
2b: 00
2c: 06
2d: 0f
2e: 84
2f: 0f
30: 8f
31: ff
32: 4a
33: 00
34: 01
35: 00
36: 01
37: 00
38: 4c
39: 00
3a: 00
pineapple:/ # cat /sys/kernel/debug/regmap/0-0066/registers
00: 5a
01: 46
02: 51
03: 50
04: 28
05: 48
06: 64
07: 64
08: 09
09: 09
0a: bc
0b: c8
0c: 15
0d: 15
0e: 24
0f: 04
10: 24
11: 71
12: 18
13: 00
14: 00
15: 20
16: 00
17: 80
18: 00
19: 00
1a: 1c
1b: 00
1c: 80
1d: 00
1e: 04
1f: 00
20: 00
21: 00
22: 08
23: 80
24: 00
25: 00
26: 00
27: 00
28: 06
29: 00
2a: 06
2b: 00
2c: 05
2d: 0f
2e: 84
2f: 00
30: 18
31: ff
32: f1
33: 00
34: 01
35: 00
36: 01
37: 00
38: 4d
39: 00
3a: 00

The values of the bq25960 register after attempting to start charging are as follows:

130|pineapple:/ # cat /sys/kernel/debug/regmap/0-0065/registers
00: 5a
01: 46
02: 51
03: 50
04: 28
05: 48
06: 64
07: 64
08: 09
09: 09
0a: bc
0b: c8
0c: 15
0d: 15
0e: 24
0f: 02
10: 24
11: 71
12: 18
13: 00
14: 00
15: 3e
16: 00
17: 80
18: 00
19: 00
1a: 1c
1b: 00
1c: c0
1d: 00
1e: 04
1f: 00
20: 00
21: 00
22: 08
23: 80
24: 00
25: 00
26: 00
27: 20
28: b9
29: 20
2a: ba
2b: 20
2c: b2
2d: 0f
2e: d9
2f: 0f
30: d7
31: 03
32: 28
33: 00
34: 01
35: 00
36: 01
37: 00
38: 4b
39: 00
3a: 00
pineapple:/ # cat /sys/kernel/debug/regmap/0-0066/registers
00: 5a
01: 46
02: 51
03: 50
04: 28
05: 48
06: 64
07: 64
08: 09
09: 09
0a: bc
0b: c8
0c: 15
0d: 15
0e: 24
0f: 04
10: 24
11: 71
12: 18
13: 00
14: 00
15: 3c
16: 00
17: 80
18: 00
19: 00
1a: 1c
1b: 00
1c: c0
1d: 00
1e: 04
1f: 00
20: 00
21: 00
22: 08
23: 80
24: 00
25: 00
26: 00
27: 20
28: bf
29: 20
2a: b5
2b: 20
2c: b8
2d: 0f
2e: d7
2f: 00
30: 1a
31: ff
32: f1
33: 00
34: 01
35: 00
36: 01
37: 00
38: 4c
39: 00
3a: 00

6 天前

0 Alice 6 天前

TI__Mastermind 37260 points

您好，
已经收到了您的案例，调查需要些时间，感谢您的耐心等待。

0 xiangyue wang 3 天前回复 Alice

Prodigy 10 points

hi, alice，We attempted to remove one of bq25960 for charging, and the phenomenon remained unchanged from the previous description. Hope to receive advice as soon as possible

0 Alice 2 天前回复 xiangyue wang

TI__Mastermind 37260 points

您好，

原理图没有发现任何问题。

在寄存器日志中没有看到 CFLY_SHORT 标志。

写入 CHG_EN = 1 后，您是否看到了这个标志？CFLY_SHORT_FLAG 是否在两个设备上都被设置？

我还注意到 REG0x12 中的 FREQ_SHIFT_1:0 位被设置为 2b11，这不是寄存器映射中列出的设置。不过，我不认为这会引起与 CFLY_SHORT 相关的问题。CFLY_SHORT 只在转换器启动时检查。它会阻止转换器启动，但不会在转换器已经运行时停止它。通常，这个标志表示器件可能已经损坏。CFLY_SHORT 会检查以下引脚之间的短路：CFH 和 CFLPMID 和 CFH客户是否测量过任何引脚间的短路？

您在多少块板上看到这个问题？您是否曾经能够在显示 CFLY_SHORT_FLAG 的设备上启用充电？

0 xiangyue wang 2 天前回复 Alice

Prodigy 10 points

您好，

我们用了2PCS主板对BQ25960进行bringup，目前发现这2PCS主板BQ25960 C2/D2 PIN和VOUT短路了，即芯片内部的QCL2击穿短路了，其他未调试的板子测试是OK的，在调试过程中会存在9V电压进入到VBUS（此时第二个BQ25960 VACOVP设置为默认的6.5V），是否会对BQ25960造成损坏，又或者在调试过程中对某些寄存器的错误操作是否会造成QCL2击穿？

0 Alice 1 天前回复 xiangyue wang

TI__Mastermind 37260 points

您好，

CFL2（C2/D2 引脚）短接到 VOUT，与 CFLY_SHORT_FLAG 被置位是一致的。这意味着 CFLY_SHORT 在第一次检查时失败了。

您是在看到 CFLY_SHORT 后开始调试的吗，还是原本在调试其他问题，然后才看到这个问题？您是在调试后才发现短路的吗？

您确认两块出现此问题的板子所进行的测试？了解测试顺序会很有帮助。

您是在 VBUS 上有 9V 电压时启用充电的吗？我理解的是否正确？启用充电时的输入电压和电池电压是多少？

我不认为错误的寄存器设置会导致损坏。

另外，请提供项目信息。