TPS25750: TPS25750 + BQ25792 Charging with USB A devices

Hi Jesse, 

Thank you for reaching out!

Could you please provide the json used? 

Also, do you have scope captures of the behavior?

Best Regards, 

Aya Khedr 

Hi Aya,

Yes here is the config JSON. I have tried both the 'old' and 'new' online config tool.

The site is not letting me attach files, so I have pasted it below. Thanks:

"""

{
"questionnaire": {
"device": "TPS25750",
"toolBuildVersion": "1.0.2",
"answers": [
null,
4,
4,
1,
1,
0,
3,
3,
1,
1,
0,
8.4,
2.3,
0.04,
0.04
],
"vendorId": "0000",
"productId": "0000",
"version": "1.0.0.2"
},
"configuration": {
"data": {
"selected_ace": [
{
"register": 6,
"data": [
0,
0,
0,
0,
0,
0,
0,
0
]
},
{
"register": 22,
"data": [
10,
48,
48,
77,
0,
0,
0,
0,
0,
0,
3
]
},
{
"register": 50,
"data": [
0,
168,
42,
44,
145,
1,
38,
44,
209,
2,
0,
44,
177,
4,
0,
244,
65,
6,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0
]
},
{
"register": 51,
"data": [
2,
44,
145,
1,
16,
44,
209,
2,
0,
44,
177,
4,
0,
244,
65,
6,
0,
69,
65,
6,
0,
0,
0,
0,
0,
0,
0,
0,
0
]
},
{
"register": 92,
"data": [
49,
0,
0,
0,
0,
0,
0,
0,
0,
16,
0,
0,
0,
0,
0,
0,
48,
0,
0,
0,
0,
0,
0,
0,
0,
12,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
1,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0
]
},
{
"register": 117,
"data": [
0,
0,
0,
0
]
}
]
}
}
}

"""

Hi Jesse, 

Thank you for providing. I will review and get back to you with feedback by Wednesday.

Best Regards, 

Aya Khedr

Hi Aya, we have some results on the TPS to BQ I2C initialization on startup.

The order of registers being written to the BQ from the TPS, are below:

0x10 REG10_Charger_Control_1 0x80
-(0)Set WATCHDOG to Disable
-(0)Set WD_RST to Normal(default)
-(0)Set VAC_OVP to 26V
-(2)Set VBUS_BACKUP to 80%*VINDPM (default)
0x14 REG14_Charger_Control_5  0x1C
-(0)Set EN_BATOC to Disable (default)
-(0)Set EN_EXTILM to Disable external ILIM_HIZ pin input regulation
-(1)Set EN_IINDPM to Enable (default)
-(3)Set IBAT_REG to Disable (default)
-(0)Set EN_IBAT to Disable IBAT discharge sensing at battery only (default)
-(0)reserved
-(0)Set SFET_PRESENT to NO ship FET populated
0x11 REG11_Charger_Control_2 0x00
-(0)Set SDRV_DLY to 'Add 10s delay time (default)'
-(0)Set SDRV_CTRL to IDLE (default)
-(0)Set HVDCP_EN to Disable HVDCP handshake (default)
-(0)Set EN_9V to Disable 9V mode in HVDCP (default)
-(0)Set EN_12V to Disable 12V mode in HVDCP (default)
-(0)Set AUTO_INDENT_EN to Disalbe D+/- detection when VBUS is plugged-in
-(0)Set FORCE_INDET to Do NOT force D+/- detection (default)
0x12 REG12_Charger_Control_3 0x00
-(0)Set DIS_FWD_OOA to Enable (default)
-(0)Set DIS_OTG_OOA to Enable (default)
-(0)Set DIS_LDO to  Enable (default)
-(0)Set WKUP_DLY to 1s (default)
-(0)Set PFM_FWD_DIS to  Enable (default)
-(0)Set PFM_OTG_DIS to  Enable (default)
-(0)Set EN_OTG to Disable OTG (default)
-(0)Set DIS_ACDRV to Disabled (default)
0x08 REG08_Precharge_Control 0x04
-(0)Set VBAT_LOWV to 15%*VREG
-(4)Set IPRECHG to 160mA
0x09 REG09_Termination_Control 0x01
-(1)Set ITERM to 40mA
0x01 REG01_Charge_Voltage_Limit 0x0348
-Set Battery Voltage Limit to 8400mV
0x03 REG03_Charge_Current_Limit 0x00E6
-Set Charge Current Limit to 2300mA

Thanks

Jesse

Hi Jesse, 

Thank you for providing.

I may need additional time to look into this. I will get back to you by the end of the week. Thank you in advance.  

Best Regards, 

Aya Khedr