Hi all!
I try make charger circuit based on ltc4100 (custom board, 100% Compliant (Rev. 1.1) SMBus Support Allows for Operation with or
without Host) and bq40z50 (bq40z50evm board, Supports Two-Wire SMBus v1.1 Interface).
This circuit make charge, discharge and calibrate is successfully, but I facing the problem:
Charge work only if I run BatteryManagementStudio (ver 1.3.31) and make smbus connection through EV2300 adapter or read any
register bq40z50 in external embedded system (watch -n 1 'i2cget -y 1 0x0b 0x09 w').
If I exit BatteryManagementStudio or stop "ping" bq40z50 via i2cget from smbus, then after about 5 seconds charge is switch off.
Repeated start BQStudio or run i2cget activate the continuation of the charge..
I check activity smbus (have pullup 10kom) from oscilloscope. If no appeals in registers bq40z50, smbus have high level and
periodically (aprox 10..40 secs) I see several bytes. Because ltc4100 is slave, this bytes send from bq40z50 (probably
broadcast), but charge is not run..
about hardware:
external PSU (19V, 3A)
pack of fresh Li-ion accumulators (3S configuration)
custom board with ltc4100 (schematic typical from data sheet)
bq40z50emv (ver 3.1r) with bq40z50 (firmware 0x12 build 0x18)
about soft:
NR=1 (no removable mode)
I download fresh BQStudio (1.3.34) - problem is not resolved
I try switch on/off options:
broadcast, sleep mode, bus timeout delay - no success :(
My question: for standalone charger enough bq40z50 and smartcharger chip? or need external active host in role master?
or that I missed?
Thanks,
Jury
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BQ40Z50 standalone mode
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