TPS6594-Q1: "EEPROM Unlock Failed" error occurs during programing device

Samuel Burke

Part Number: TPS6594-Q1
Other Parts Discussed in Thread: TPS6594EVM, , SCALABLE-PMIC-GUI

Tool/software:

HW/SW being used:

TPS6594EVM evaluation board
TPS6594-Q1 PMIC
Scalable-PMIC-GUI 3.0.0

I have followed the steps to configure the TPS6594-Q1 chip on the evaluation board using the Scalable-PMIC-GUI tool. After configuring the PMIC chip I am no longer able to change the configuration and write a new (or even the same) configuration file to that chip. I receive the following error when trying to write a configuration files to the device:

"ERROR: EEPROM Unlock Failed"

When configuring the device for the first time, I was sure to not lock the device, when the pop up prompt asked "Do you want to lock this device?"

Any help debugging this error is appreciated.

2 months ago

0 Katie Pier 2 months ago

TI__Guru* 77531 points

Hi Samuel,

Have you checked for the residual voltage e.g. from how part is connected/your board, as mentioned on the related thread you linked above? https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1198665/tps6594-q1-tps65941515rwerq1-eeprom-unlock-failed-part-2/4519442#4519442

There are also some other threads with things to also check linked on right side of the post:

https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1285377/lp8764-q1-error-of-eeprom-unlock-failed-when-trying-to-reprogram-an-lp8764

https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1382971/tps6594-q1-eeprom-not-unlocking-even-after-writing-sequence/5294107#5294107

Regards,

Katie

0 Samuel Burke 2 months ago in reply to Katie Pier

Prodigy 10 points

Katie,

I am trying to program the PMIC chip with the following values:

PMIC Specifications			Schematic Power Block Diagram
Power Port	Voltage Range	Maximum Current	Signal Name	Set Voltage	Expected Current
BUCK_1	0.30V-3.34V	3.5A	VDDA3V3	3.3V	0.90A
BUCK_2	0.30V-3.34V	3.5A	VDD1V	1.0V	1.50A
BUCK_3	0.30V-3.34V	3.5A	VDD3V3	3.3V	0.50A
BUCK_4	0.30V-3.34V	4.0A	VDD1V8	1.8V	1.10A
BUCK_5	0.30V-3.34V	2.0A	VDD18(PY)	1.8V	0.54A
LDO1	0.60V-3.30V	0.5A	VDD_CASC	1.0V	0.00A
LDO2	0.60V-3.30V	0.5A	VDD_COLMUX	1.0V	0.00A
LDO3	0.60V-3.30V	0.5A	(unused)
LDO4	1.20V-3.30V	0.3A	VDD2V5	2.5V	0.05A

This is derived from V1P8			VDD1V2(DDR)	Regulated through external LDO

Would you be able to assist in creating a .JSON file to match this configuration.

I think the .JSON file that we created is not correct.

0 Michael Gambrill 2 months ago in reply to Samuel Burke

TI__Mastermind 25195 points

Hello Sam,

From your screen shot, you may not have configured the VCCA settings correctly for your system. Your table has 3.3V output for BUCK1 and BUCK3. This means you're using a 5V input, correct? If so, the settings in screen shot show VCCA is expecting 3.3V with very tight OV/UV threshold. You won't be able to program the PMIC if the VCCA is not in the correct range.

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TPS6594-Q1: "EEPROM Unlock Failed" error occurs during programing device