BQ33100EVM-001: EVM configuration guidance sought

Hello Howard,

Is this still happening after the calibration? Can you share a screenshot of your bqStudio dashboard?

You will need to let the gauge learn the ESR by performing a learning cycle on the capacitors.

Can you share your .gg file with the configurations?

Sincerely,

Wyatt Keller

Hello Wyatt,

I still have the same issues, though its probably down to a lot of confusion on my part.

Currently, the Operation status is showing -

From this i believe a Capacitance learning is in progress, started by me issuing a 24(hex) command followed by 25(hex) command in the Pro section. However, this has been like this for in excess of 1hour. I note the individual capacitor voltages are dropping, yet the fuel gauge still shows 100%.

My set up is still the same. 14V supply to the EVM. Five 100F, 2.7V caps are attached to the EVM. I have done a Capacitor Voltage Calibration.

I also attach the Data Flash export file in the hope you can spot the issues and point me in the right direction to get this going properly.

i had hoped to set the board so the total stack voltage was 12.5V, limiting each capacitor to 2.5V. Id be grateful if you could give me a basic step by step guide as to what values i should be changing and what commands i need to issue to do this?

[Header]
bq EVSW Version = 0.9.92	
DeviceName = bq33100 v0.15
Time = 12/04/2021 16:06:24	


[Voltage(Safety)]
OV Threshold = 100
OV Recovery = 0
OV Time = 2
CIM Fail Voltage = 550
CIM Time = 10
CIM Recovery = 500
Min CIM Check Voltage = 1000
[Current(Safety)]
OC Chg = 1000
OC Chg Time = 5
OC Chg Recovery = 900
CLBAD Current = 15
CLBAD Time = 60
CLBAD Recovery = 10
Current Recovery Time = 5
OC Dsg = 0F
OC Dsg Time = 0F
OC Dsg Recovery = 5
SC Chg Cfg = F4
SC Dsg Cfg = F7
SC Recovery = 1
[Temperature(Safety)]
OT Chg = 68.0
OT Chg Time = 2
OT Chg Recovery = 63.0
[AFE Verification(Safety)]
AFE Fail Limit = 100
AFE Init Retry Limit = 6
AFE Init Limit = 20

[Charge Cfg(Charge Control)]
Chg Voltage = 10000
Chg Current = 500
Chg Enable Delay = 0
[Full Charge Cfg(Charge Control)]
Taper Current = 3
Taper Voltage = 200
Current Taper Window = 2
FC Set % = -1
FC Clear % = 98
[Capacitance Balancing Cfg(Charge Control)]
CB Threshold = 800
CB Min = 5
CB Restart = 10

[Data(System Data)]
Design Voltage = 9000
Manuf Date = 01-Jan-1980
Ser. Num. = 0001
Design Capacitance = 500.0
Init 1st Capacitance = 100.0
Capacitance = 500.0
Design ESR = 400
Initial ESR = 400
ESR = 400
Manuf Name = Texas Inst.
Device Name = bq33100
Init Safety Status = 0000
[Manufacturer Data(System Data)]
Pack Lot Code = 0000
PCB Lot Code = 0000
Firmware Version = 0000
Hardware Revision = 0000
[Manufacturer Info(System Data)]
Manuf. Info = 0123456789ABCDEF0123456789ABCDE
[Lifetime Data(System Data)]
Lifetime Max Temp = 57.4
Lifetime Min Temp = 22.2
Lifetime Max Capacitor Voltage = 2434

[Registers(Configuration)]
Operation Cfg = 0448
FET Action = 0000
Fault = 0000
[AFE(Configuration)]
AFE State_CTL = 00
[Power(Configuration)]
Flash Update OK Voltage = 4000
Shutdown Voltage = 4000

[System Requirement(Monitoring)]
Min Power = 10
Required Time = 60
Min Voltage = 4000
[Charging Voltage(Monitoring)]
V Chg Nominal = 9000
V Chg A = 9500
V Chg B = 10000
V Chg Max = 10500
V Learn Max = 10500
[Learning Configuration(Monitoring)]
Learning Frequency = 2
Measurement Margin % = 1
Max Chg Time = 300
Max Dsg Time = 10
Learn Delta Voltage = 500
Cap Start Time = 320
[Current Thresholds(Monitoring)]
Dsg Current Threshold = 10
Chg Current Threshold = 0

[Data(Calibration)]
Current Gain = 20
CC Delta = 20
Cap1 K-factor = 7700
Cap2 K-factor = 20500
Cap3 K-factor = 20500
Cap4 K-factor = 20500
Cap5 K-factor = 20500
K-factor cap override flag = 9669
System Voltage K-factor = 24500
Stack Voltage K-factor = 24500
K-factor stack override flag = 0000
CC Offset = -1.14
Board Offset = 0
Int Temp Offset = 0.0
Ext1 Temp Offset = 0.0
Ext2 Temp Offset = 0.0
ESR Offset = 0
[Config(Calibration)]
CC Current = 3000
Voltage Signal = 10500
Temp Signal = 298.0
CC Offset Time = 250
ADC Offset Time = 32
CC Gain Time = 250
Voltage Time = 2080
Temperature Time = 32
Cal Mode Timeout = 300
[Temp Model(Calibration)]
Ext Coef a1 = -14812
Ext Coef a2 = 24729
Ext Coef a3 = -21265
Ext Coef a4 = 28353
Ext Coef a5 = 759
Ext Coef b1 = -399
Ext Coef b2 = 764
Ext Coef b3 = -3535
Ext Coef b4 = 5059
Ext rc0 = 11703
Ext adc0 = 11813
Rpad = 87
Rint = 17740
Int Coef 1 = 0
Int Coef 2 = 0
Int Coef 3 = -12263
Int Coef 4 = 6106
Int Min AD = 0
Int Max Temp = 610.6
[Current(Calibration)]
Filter = 239
Dead Band = 5
CC Deadband = 2.9

Thanks

Howard

Hi Howard,

Can you share a screenshot of Calibrate section?

Design Voltage, Design Capacitance and Design ESR values are the design values of the capacitors used, you have to change those to the actual values. Initial values are the first learned values. Please refer to the datasheet for more information.

For learning, you also need to connect a load to CAPOUT and VSS, for learning process, please refer to datasheet 8.3.1 section.

Application report SLUA751 could be useful.

Best Regards,
Abraham

Hi Abraham,

Could you tell me exactly what values to change and to what? I'm going around in circles reading the datasheet and all the associated documents and making no headway. Yesterday, it was stuck in the learning mode for hours and then quite a number of the components on the eval board started to get ridiculously hot.

My five Capacitors are (each) 100F, 2.7V and 15mOhm and i want to limit the voltage on each capacitor to 2.5V. I want to be able to balance the voltage across the Capacitors.

I presume by Calibrate section you want the Calibration tab under Data Flash? Wasn't that information available in the data i posted earlier?

Howard

Hi Howard,

Set cell number to five,DF:Configuration:Registers:Operation Cfg:CC2, CC1, CC0 = 100, STACK=0

Set DF:Charge Control:Charge Cfg:Chg Voltage, DF:System Data:Data:Design Voltage, and DF:Monitoring:Charging Voltage:V Chg Nominal to 2.1 V (use recommended value by the supercapacitor manufacturer for achieving the lifetime ) × 5.

Set DF:Monitoring:Charging Voltage:V Chg Max and DF:Monitoring:Charging Voltage:V Learn Max to 2.5V x 5.  Set DF:Monitoring:Charging Voltage:V Chg A and DF:Monitoring:Charging Voltage:V Chg B to lie equally between V Chg Nominal and V Chg Max. 

Set DF:System Data:Data:Design Capacitance = 20 F
DF:System Data:Data:Init 1st Capacitance = 20 F
DF:System Data:Data:Capacitance = 20 F

Set DF:System Data:Data:Design ESR = 75 mΩ
DF:System Data:Data:Initial ESR = 75 mΩ
DF:System Data:Data:ESR = 75 mΩ

By Calibrate section I meant something like this

Hello Abraham,

Thanks for that, i will try it later.

Its strange; i fired the board up first thing and it went to Cell Balance, resulting in the following window -

Which is the first time i havent had an OV flag.

Here is the Calibrate window -

I'll post later when ive followed your steps.

Howard

Hi Howard,

howard banks said:

On the System Voltage Calibration the measured system voltage is shown as 13991mV but the actual system voltage is shown as 2000mV. I don't appear to be able to change this, such that its saved. it always reverts back to 2000mV.

For this question, check the box in front of System Voltage Calibration, then change the actual system voltage to the measured system voltage, then calibrate the device.

Hello Abraham,

I seem to be making progress, thanks to your help.

SBS screen is now showing correct ESR and Capacitance -

Why is the Cap1 K-factor so out of step with the others-

Its been hit and miss trying to do a capacitor learn as it normally results in a LCTO. Am i correct to increase the Max Chg Time to increase the timeout?

Is there a way i can read the status of CHGLVL1 and CHGLVL0 pins?

Thanks

Howard

Hi Abraham,

I see in the charge control (8.3.3) reference is made to discrete and smart control. How do i know if im using discrete or smart control?

8.3.1.1 seems to indicate that the BQ33100 can change the charging voltage at step 6? Is this smart control?

If i change the charge voltage using commands 32-35 is this discrete control?

Can i configure the BQ33100 to only manage charge and cell balancing and not do any learn? (I would preload the cap and esr values)

Can you provide instruction on how to make a read of the DF to obtain System Data: Design Capacitance?

What commands do i need to send to set the learn frequency to 10mins - i know from 8.3.1.2 i send a value of 250 but how?

Thanks for your continued support

Howard

Hi Howard,

You can change the learning frequency in Data Flash: Monitoring: Learning Configuration: Learning Frequency in the software, change the value and click Write All.