Hi,
I fail to update the design capacity to 1800 (0x0708), can you ensure my step is correct? I done a read after i write new capacity and it report 0x07 0x08, which means my capacity changed successfully, but I guess I am facing some issue on calculating the checksum, can anyone help to advise me on the calculation?
Here is the steps I use to make the changes:
1. (WR 0x00 0x14 0x04) - unseal
2. (WR 0x00 0x72 0x36) - unseal
3. (WR 0x00 0xFF 0xFF) - full access
4. (WR 0x00 0xFF 0xFF) - full access
5. (WR 0x61 0x00) - enable block data flash control
6. (WR 0x3E 0x30) - design cap sub-class id is 48(0x30)
7. (WR 0x3F 0x00) - design cap (0ffset = 10)
8. (RD 0x60) read old checksum (old checksum = 0x64)
9. (RD 0x4A) read old design cap (MSB = 0x03)
10. (RD 0x4B) read old design cap (LSB = 0xE8)
11. (WR 0x4A 0x07) write new design cap (MSB = 0x07)
12. (WR 0x4B 0x08) write new design cap (LSB = 0x08)
13. (WR 0x60 new checksum) write new checksum (new checksum = 0x40, formula provided by datasheet)
**fail to write new checksum to bq27510, process stop
14. (WR 0x00 0x41 0x00) reset gauge
15. (WR 0x00 0x20 0x00) seal
Thanks,
KH