PGA460: PGA460 frequency register rewrite procedure

Ichi

Part Number: PGA460
Other Parts Discussed in Thread: , ENERGIA

Tool/software:

I am a Japanese engineer.
I am using UART to communicate between PGA460SPM-EVM and Raspberry Pi Pico and programming in Python.
The ultrasonic sensor implemented in this EVM is UTR-1440K-TT-R (PUI Audio), so I am trying to rewrite the frequency to 40kHz (0x32).
This IC needs to unlock the EEPROM, so I sent 0x69,0x68 to the EE_CNTRL register (40).
After this I wrote 0x32 to the FREQUENCY register (1c).
Then I read the FREQUENCY register and found that it was still at the default value of “8c”.
Moreover, the Diagnostic Field shows an error “54h”.
Why can't I rewrite the register?
Am I doing something wrong?
Please advise.

Below is the data monitor screen.

unlock_st1 : 0 0x55
unlock_st1 : 1 0xa
unlock_st1 : 2 0x40
unlock_st1 : 3 0x69
unlock_st1 : 4 0x4c
unlock_st2 : 0 0x55
unlock_st2 : 1 0xa
unlock_st2 : 2 0x40
unlock_st2 : 3 0x68
unlock_st2 : 4 0x4d
WRcmd : 0 0x55
WRcmd : 1 0x1c
WRcmd : 2 0x32
WRcmd : 3
0xb1 RegRd_Wr: 0x55
RegRd_Wr: 0x9
RegRd_Wr:0x1c
RegRd_Wr:0xda
Reg_Rd:
0x54 Reg_Rd:0x8c
Reg_Rd:
0x1f 01010100
10001100
00011111

11 months ago

0 Eddie LaCost 11 months ago

TI__Mastermind 44030 points

Hello,

Please refer to the PGA460 Software Development Guide and PGA460 Energia Library and Code Example for instructions, recommendations, and source code examples on programming the PGA460 registers.

To get a better understanding of how all registers impact performance, view the six part PGA460 EVM GUI video series at: https://training.ti.com/ultrasonic-sensing-pga460-q1?context=1128182

There are also several posts with simplified example code that could be useful to check your UART communication.

https://e2e.ti.com/support/sensors-group/sensors/f/sensors-forum/707250/pga460-coding-procedure

This post also includes an example register configuration for the UTR-1440K-TT-R transducer.

https://e2e.ti.com/support/sensors-group/sensors/f/sensors-forum/910128/pga460-q1-pga460-q1-and-arduino/3371410#3371410

0 Ichi 11 months ago in reply to Eddie LaCost

Prodigy 20 points

Eddie, thanks for the reply.

I downloaded the code example and library and checked it out.
Looking at the function “burnEEPROM()”, it first sends regData = 0x68 as unlocked EEPROM.
(EEPRGM bit in the EE_CNTRL register is set to '0')
After a delay, regData = 0x69 is sent as unlock EEPROM.
('1' to the EEPRGM bit in the EE_CNTRL register)
This is the correct sequence, right?
Immediately after that, should I rewrite each parameter with “EEPROM batch write”?

Also, is there a Mac version of the GUI for the PGA460PSM-EVM?
Any advice would be appreciated.

0 Eddie LaCost 11 months ago in reply to Ichi

TI__Mastermind 44030 points

Ichi,

You would actually need to perform the register writes, then execute the EEPROM burn routine.

The general procedure of updating, programming, and burning the EEPROM memory is:

Send bulk register write command (command 12) or several singe register write commands (command 10) to update the device settings. See Energia functions pga460::defaultPGA460 (bulk write) pga460::registerWrite (single write) in PGA460_USSC.cpp file for an example implementation.
Execute EEPROM burn routine as described in section "7.6.1 EEPROM Programming" of the datasheet. See Energia function pga460::burnEEPROM in PGA460_USSC.cpp file for an example implementation.

No, we do not have a Mac version of the GUI.

0 Ichi 11 months ago in reply to Eddie LaCost

Prodigy 20 points

Eddie, thank you again for your response.

I have reviewed the Energia functions pga460::defaultPGA460 (bulk write) pga460::registerWrite (single write) in PGA460_USSC.cpp file as you indicated.
I found that I forgot to include the registerWrite command in the program I created in Python.
I appended this command (0x0A) after The Sync Field (0x55) and sent it.
As a result, the error disappeared and the frequency was successfully rewritten.

Thank you for the favor.

P.S. I am very disappointed that there is no Mac version of the GUI.

Sensors

Sensors forum

PGA460: PGA460 frequency register rewrite procedure