Tool/software:
Hallo,
I have a BQ25620 running and control it via a linux computer.
It works fine except:
- it does not charge the battery, it just powers the system (via battery or via VBUS, if available)
- VBUS stays high after unplugging the USB charger; when I enable EN_HIZ, then USB voltage drops to zero (charger not plugged in).
I was able to verify all ADC values using lab measurement equipment.
19:07:13 - Charging (CC/Pre), IBUS: 392 mA
19:07:13 - Charging (CC/Pre), IBAT: 16 mA
19:07:13 - Charging (CC/Pre), VBUS: 5054 mV
19:07:13 - Charging (CC/Pre), VPMID: 5050 mV
19:07:13 - Charging (CC/Pre), VBAT: 3611 mV
19:07:13 - Charging (CC/Pre), VSYS: 3621 mV
attached the register dumps:
- 00: initial after powering the system from battery only
- 01: after setting
#disable watchdog --> a1 --> a0
set_register_8(bus,0x16,0xa0)# Iprechg to 240mA
set_register_16(bus,0x10,0x00C0)#disable thermal
set_register_8(bus,0x1A,0x80)#disable EN_TERM 0x06 -> 0x02
set_register_8(bus,0x14,0x02)# enable ADC
set_register_8(bus,0x26,0x80)
set_register_8(bus,0x27,0x04) - 02: after plugging in a charger. Charger means Vcc + GND on Lab Power supply, D+ and D- shorted. I can see the VBUS voltage, but I ould expect a high (>1A) charge current. My power supply shows 200mA@5.2V
- 03: after unplugging the charger - VBUS stays at VPMID level. I could clear it by setting EN_HIZ =1 for a short time
The schematic is attached as screenshot.
Any help or tips appreciated.
* Created: Tue Sep 19 18:57:42 CEST 2023 * * Format: Register Name tab Character, Register Address tab Character, Hexadecimal register value. * Device: BQ25620/2 * BQZ Container: Charger_1_00-bq25620)2.bqz * REG02_Charge_Current_Limit 0340 REG04_Charge_Voltage_Limit 0D20 REG06_Input_Current_Limit 0A00 REG08_Input_Voltage_Limit 0E60 REG0A_IOTG_Regulation 0320 REG0C_VOTG_Regulation 0FC0 REG0E_Minimal_System_Voltage 0B00 REG10_Pre-charge_Control 0050 REG12_Termination_Control 0030 REG14_Charge_Control 06 REG15_Charge_Timer_Control 5C REG16_Charger_Control_0 A1 REG17_Charger_Control_1 4F REG18_Charger_Control_2 04 REG19_Charger_Control_3 C0 REG1A_NTC_Control_0 3D REG1B_NTC_Control_1 25 REG1C_NTC_Control_2 3F REG1D_Charger_Status_0 01 REG1E_Charger_Status_1 00 REG1F_FAULT_Status_0 00 REG20_Charger_Flag_0 01 REG21_Charger_Flag_1 00 REG22_FAULT_Flag_0 00 REG23_Charger_Mask_0 00 REG24_Charger_Mask_1 00 REG25_FAULT_Mask_0 00 REG26_ADC_Control 30 REG27_ADC_Function_Disable_0 00 REG28_IBUS_ADC 0000 REG2A_IBAT_ADC 0000 REG2C_VBUS_ADC 0000 REG2E_VPMID_ADC 0000 REG30_VBAT_ADC 0000 REG32_VSYS_ADC 0000 REG34_TS_ADC 0000 REG36_TDIE_ADC 0000 REG38_Part_Information 02
* Created: Tue Sep 19 18:59:10 CEST 2023 * * Format: Register Name tab Character, Register Address tab Character, Hexadecimal register value. * Device: BQ25620/2 * BQZ Container: Charger_1_00-bq25620)2.bqz * REG02_Charge_Current_Limit 0340 REG04_Charge_Voltage_Limit 0D20 REG06_Input_Current_Limit 0A00 REG08_Input_Voltage_Limit 0E60 REG0A_IOTG_Regulation 0320 REG0C_VOTG_Regulation 0FC0 REG0E_Minimal_System_Voltage 0B00 REG10_Pre-charge_Control 00C0 REG12_Termination_Control 0030 REG14_Charge_Control 02 REG15_Charge_Timer_Control 5C REG16_Charger_Control_0 A0 REG17_Charger_Control_1 4F REG18_Charger_Control_2 04 REG19_Charger_Control_3 C0 REG1A_NTC_Control_0 80 REG1B_NTC_Control_1 25 REG1C_NTC_Control_2 3F REG1D_Charger_Status_0 00 REG1E_Charger_Status_1 00 REG1F_FAULT_Status_0 00 REG20_Charger_Flag_0 00 REG21_Charger_Flag_1 00 REG22_FAULT_Flag_0 00 REG23_Charger_Mask_0 00 REG24_Charger_Mask_1 00 REG25_FAULT_Mask_0 00 REG26_ADC_Control 80 REG27_ADC_Function_Disable_0 04 REG28_IBUS_ADC 0000 REG2A_IBAT_ADC FF18 REG2C_VBUS_ADC 0000 REG2E_VPMID_ADC 0CE4 REG30_VBAT_ADC 0E1E REG32_VSYS_ADC 0E16 REG34_TS_ADC 0000 REG36_TDIE_ADC 003F REG38_Part_Information 02
* Created: Tue Sep 19 18:59:41 CEST 2023 * * Format: Register Name tab Character, Register Address tab Character, Hexadecimal register value. * Device: BQ25620/2 * BQZ Container: Charger_1_00-bq25620)2.bqz * REG02_Charge_Current_Limit 0340 REG04_Charge_Voltage_Limit 0D20 REG06_Input_Current_Limit 04B0 REG08_Input_Voltage_Limit 0E60 REG0A_IOTG_Regulation 0320 REG0C_VOTG_Regulation 0FC0 REG0E_Minimal_System_Voltage 0B00 REG10_Pre-charge_Control 00C0 REG12_Termination_Control 0030 REG14_Charge_Control 02 REG15_Charge_Timer_Control 5C REG16_Charger_Control_0 A0 REG17_Charger_Control_1 4F REG18_Charger_Control_2 04 REG19_Charger_Control_3 C0 REG1A_NTC_Control_0 80 REG1B_NTC_Control_1 25 REG1C_NTC_Control_2 3F REG1D_Charger_Status_0 08 REG1E_Charger_Status_1 0B REG1F_FAULT_Status_0 00 REG20_Charger_Flag_0 08 REG21_Charger_Flag_1 09 REG22_FAULT_Flag_0 00 REG23_Charger_Mask_0 00 REG24_Charger_Mask_1 00 REG25_FAULT_Mask_0 00 REG26_ADC_Control 80 REG27_ADC_Function_Disable_0 04 REG28_IBUS_ADC 00BA REG2A_IBAT_ADC 0008 REG2C_VBUS_ADC 13DC REG2E_VPMID_ADC 13D8 REG30_VBAT_ADC 0E30 REG32_VSYS_ADC 0E3A REG34_TS_ADC 0000 REG36_TDIE_ADC 005E REG38_Part_Information 02
* Created: Tue Sep 19 19:00:04 CEST 2023 * * Format: Register Name tab Character, Register Address tab Character, Hexadecimal register value. * Device: BQ25620/2 * BQZ Container: Charger_1_00-bq25620)2.bqz * REG02_Charge_Current_Limit 0340 REG04_Charge_Voltage_Limit 0D20 REG06_Input_Current_Limit 04B0 REG08_Input_Voltage_Limit 0E60 REG0A_IOTG_Regulation 0320 REG0C_VOTG_Regulation 0FC0 REG0E_Minimal_System_Voltage 0B00 REG10_Pre-charge_Control 00C0 REG12_Termination_Control 0030 REG14_Charge_Control 02 REG15_Charge_Timer_Control 5C REG16_Charger_Control_0 A0 REG17_Charger_Control_1 4F REG18_Charger_Control_2 04 REG19_Charger_Control_3 C0 REG1A_NTC_Control_0 80 REG1B_NTC_Control_1 25 REG1C_NTC_Control_2 3F REG1D_Charger_Status_0 04 REG1E_Charger_Status_1 0B REG1F_FAULT_Status_0 00 REG20_Charger_Flag_0 04 REG21_Charger_Flag_1 00 REG22_FAULT_Flag_0 00 REG23_Charger_Mask_0 00 REG24_Charger_Mask_1 00 REG25_FAULT_Mask_0 00 REG26_ADC_Control 80 REG27_ADC_Function_Disable_0 04 REG28_IBUS_ADC 0000 REG2A_IBAT_ADC 0008 REG2C_VBUS_ADC 1268 REG2E_VPMID_ADC 1260 REG30_VBAT_ADC 0E14 REG32_VSYS_ADC 0E06 REG34_TS_ADC 0000 REG36_TDIE_ADC 0059 REG38_Part_Information 02
