Tool/software:
Hello,
BQ25720 is configured to manage a 3S battery. When no battery inserted, using a multimeter I checked that the VSYS voltage is 9.2V .
I try to read VSYS value (9.2V) with the internal ADC, but the reported value is not correct:
ADCVSYSVBAT Register (SMBus address = 26h) report 0x6300 => VBAT is zero (OK) and VSYS= 0x63*64mV= 6 336mV (!=9.2V)
Below is the sequence i execute before readin the 0x26 register.
(Reported voltage is correct when a battery is inserted)
Thanks for your help.
Philippe
#Diasble EN_LWPWR in ChargeOption0 Register (SMBus address = 12h) [reset = E70Eh]
echo "0x670e" > /sys/bus/i2c/devices/0-0009/ChargeOption0
#Config PSYS_CONFIG to "00" in ChargeOption1 Register (SMBus address = 30h) [reset = 3300h]
echo "0x0300" > /sys/bus/i2c/devices/0-0009/ChargeOption1
#Setup ADC_FULLSCALE=2.04V and enable All ADC - ADCOption Register (SMBus address = 35h)
echo "0x00FF" > /sys/bus/i2c/devices/0-0009/ADCOption
#Setup ADC_CONV to continuous update (1sec) - ADCOption Register (SMBus address = 35h)
echo "0x80FF" > /sys/bus/i2c/devices/0-0009/ADCOption
