Other Parts Discussed in Thread: BQ25756EVM, BQSTUDIO, , BQ25756, BQ25798
Tool/software:
Hi,
I'm using TPS25751EVM and Bq25756EVM togerher with considering the connection specified in the user guide. I succeed to work them properly for a single physical cell LFP 3.2V properly with selecting PP1 source for PDO1.
I made some of changes to be able to work them together properly:
1) Add external boost converter from battery to generate PP5V. This boost converter 800mA current limited.
2) PP5V also used for "EXT_DRV" for the module BQ25756EVM.
3) "LDO_3V3" supply via J11 connector to BQ25756EVM SMBUS.
If I select PP1 source for PDO 1;
*Sink from charger 20V-15V-9V-5V at 3A without any problem. Battery goes into the charing.
*If I connect source I can get 5V/200mA or 5V/2.5A depending on the source and also 20V/3A it gives properly.
I dont want to use extra boost converter like 3.2V to 5V/3.6A since the size of the PCB is limited and cost issue. So I have tried to select which is specified PPHV source for PP3 for PDO 1.
At that moment sink is working properly but when I connect a source VBUS goes into hiccup mode and restart always.
At that moment;
*PP5V and LDO_3V still remain constant. When look at the VBUS, It behaves ON 5V and goes into the 0V again. It tries each second and goes into loop. I can not get any source if I connect other source like 20V/3A.
There might be clue for the find the reason, if I disconnect J11 ribon cable between BQ25756EVM and TPS25751EVM to be able to reach via BQSTudio to read registers, at that time if I connect source again the TPS25751 J3 connector can source successfully.
I believe in that the BQ25756EVM is working properly and I aleady tested on the bech standalone and it's working properly with full the voltage range as specified. I think there is a protection caused by the TPS25751 goes into the hiccup mode when I select PP3.
Could you please check the .json file? You may find the what am I missing?
{
"questionnaire": {
"device": "TPS25751",
"toolBuildVersion": "1.1.0",
"answers": [
null, 0, 3, 3, 0, 0, 3, 0, 1, 1, 1, 3, 4, 3, 1.536, 15, 0.25, 1, 0
],
"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": [0,0,0,0,0,0,0,0,0,0,3]
},
{
"register": 40,
"data": [2,1,63,75,0,0,0,0,0,0,0,0,0,0,0,0,1]
},
{
"register": 41,
"data": [210,0,128,0]
},
{
"register": 50,
"data": [
5,170,42,44,
145,
49,
32,
44,
225,
2,
0,
44,
177,
4,
0,
44,
177,
148,
237,
44,
65,
54,
32,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
]
},
{
"register": 51,
"data": [
4,44,145,1,16,44,209,2,0,44,177,4,0,44,65,54,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
]
},
{
"register": 55,
"data": [118,192,18,65,144,145,33,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
},
{
"register": 66,
"data": [10,0,8,0]
},
{
"register": 92,
"data": [207,12,0,0,0,0,0,0,0,0,0,0,0,4,0,0,0,4,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
},
{
"register": 112,
"data": [3]
},
{
"register": 119,
"data": [0,0,0,0,0,0,0,0,0,0,0,4,0,45,0]
},
{
"register": 120,
"data": [0,0,0,128]
},
{
"register": 122,
"data": [0,0,0,0]
},
{
"register": 123,
"data": [0,2,255,255,0,0,0,0,0,0,0,0,0,0,0,0]
},
{
"register": 125,
"data": [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
},
{
"register": 126,
"data": [0,0,0,0,0,0,0,0,0,0,0,0,0,0]
},
{
"register": 152,
"data": [0,0,0,0,0,0,0,0,0,0,0]
}
]
}
}
}
