[FAQ] TPS25990: How to program the non-volatile memory (NVM) in TPS25990 with a revised configuration file?

The TPS25990 eFuse has a non-volatile memory (NVM) consisting of three One-Time Programmable (OTP) banks. One of them is factory-programmed with default values in a set of configuration registers. If the user wants to program the other two banks with revised values in the configuration registers, the below steps should be followed.

1) Apply a power supply in the range of 10 V to 13 V to VDD. If VIN and VDD are connected through a RC filter, the power supply needs to be connected to VIN.   

2) Make sure the data (SDA) and clock (SCL) lines are pulled up to a voltage in the range of 1.8 V to 5 V with proper pull-up resistors.

3) Disable MFR_WRITE_PROTECT by writing 0xA2 to the F8h register.

4) Import the user defined configuration file into the configuration registers of the particular device intended to program by selecting its address.

5) To check if at least one bank of internal NVM is available to be programmed, read the CONFIG_NVM_STAT (BIT[0]) in the STATUS_MFR_SPECIFIC_2 (F3h) register.

          1 ⇒ No bank is available in the NVM for programming.

          0 ⇒ At least one bank is available in the NVM for programming.

6) Send the STORE_USER_ALL (15h) command to program the NVM with the revised configuration registers.

7) Enable WRITE_PROTECT by writing 0x00 to the F8h register.

8) To check whether the STORE_USER_ALL command was successful or not, read the MEMORY_FLT (BIT[4]) in the STATUS_CML (7Eh) register.

          1 ⇒ STORE_USER_ALL command was unsuccessful.

          0 ⇒ STORE_USER_ALL command was successful.

9) Do input power recycling (both VDD and VIN) and read all the registers. The user should see the revised values in the configuration registers.

• TPS25990 only supports two (2) times of programming the NVM. If you are sending STORE_USER_ALL (15h), be sure.

• The steps above do not consider the external EEPROM connected. 

A template of the configuration file is attached below. 

/** WARNING: The exported file should not be edited. When uploading a file, the contents are not validated by the GUI. It is the responsibility of the user to ensure that the content is valid. **/
58h = 0x0095
59h = 0x008D
57h = 0x00A5
55h = 0x000E
43h = 0x0095
5Fh = 0x008D
51h = 0x007E
4Fh = 0x0085
6Bh = 0x00FF
5Dh = 0x00FF
E0h = 0x32
E1h = 0x00
E2h = 0x00
DBh = 0x0100
E3h = 0x0000
E4h = 0x1400
E5h = 0x00
E6h = 0x14
E7h = 0x84
E8h = 0x00
E9h = 0x00
EAh = 0x00
EBh = 0xFF
ECh = 0x9D
EDh = 0xFF
F0h = 0x00
F1h = 0x00
F9h = 0x00
CHECKSUM = 149
RIMON = 1100000Ohm

Note that values of only the following configuration registers can be stored in the NVM.

• PMBUS_ADDR (FBh)
• VIN_UV_FLT (59h)
• VIN_OV_FLT (55h)
• VOUT_PGTH (5Fh)
• OT_FLT (4Fh)
• VIREF (E0h)
• GPIO_CONFIG_12 (E1h)
• GPIO_CONFIG_34 (E2h)
• FAULT_MASK (E3h)
• DEVICE_CONFIG (E4h)
• BB_CONFIG (E5h)
• RETRY_CONFIG (E7h)
• VCMPxREF (EBh)
• GPDAC1 (F0h)
• GPDAC2 (F1h)
• INS_DLY (F9h)

During input power recycling at VDD pin or enable recycling at EN/UVLO pin, the values in the other configuration registers reset to their factory defaults.