BQ79600EVM: How to enter sleep mode with BQ79718EVM?

JEHEON JEONG

Prodigy 140 points

Part Number: BQ79600EVM
Other Parts Discussed in Thread: BQ79718-Q1

Tool/software:

Hello, this is JJ

From the BQ79718-Q1 datasheet, I can find the sleep mode procedure.

I tried to flash these 2 code seperately.

But both codes does not enter the sleep mode.

WriteReg(1, CONTROL1, 0x04, 1, FRMWRT_SGL_W); // CMU sleep mode signal
WriteReg(0, CONTROL1, 0x04, 1, FRMWRT_STK_W); // CMU sleep mode signal

Q1. How to set the communication parameter? (SGL_W or STK_W??)

Q2. Why cannot I get the sleep mode result with BQ79718EVM?

Best regards,

6 months ago

0 Benjamin Luty 6 months ago

TI__Expert 6720 points

JJ,

Firstly, how are determining the device is not entering sleep mode?

Secondly, are you sure you are correctly auto-addressing the devices before attempting to use single or stack writes? Either type will work, but auto-addressing is required beforehand. You can check if you've auto-addressed correctly with a logic analyzer.

Sending any logic analyzer logs you take may be helpful.

Regards,

0 JEHEON JEONG 6 months ago in reply to Benjamin Luty

Prodigy 140 points

Hello, This is JJ

First of all, I already completed the Auto-address process.

BQ79600-Q1: cannot get the partid from BQ79718EVM - Power management forum - Power management - TI E2E support forums

I measured the voltage using multimeter and there is no difference between operating mode and sleep mode command.

Regards,

0 Benjamin Luty 6 months ago in reply to JEHEON JEONG

TI__Expert 6720 points

JJ,

None of the voltages are supposed to change when the device enters sleep mode:

It is the current that should drop when entering sleep mode.

Again, if you could take a logic analyzer log of the commands being sent and received, that would be helpful. If you do not have access to a logic analyzer, just telling me all the commands and responses may suffice.

Regards,

0 JEHEON JEONG 6 months ago in reply to Benjamin Luty

Prodigy 140 points

Thank you Benjamin,

I want to clarify one thing

What is the logic analyzer? is it a TI's product? or just a oscilloscope ?

Regards,

0 Benjamin Luty 6 months ago in reply to JEHEON JEONG

TI__Expert 6720 points

JJ,

A logic analyzer is similar to an oscilloscope, except that it usually comes with software to decode communication protocols or similar. In this case, you would probe the SPI lines (MOSI, MISO, nCS, and CLK) with a logic analyzer and it could show you which commands were sent and received by the devices. This would tell us if there are any errors in your command sequence.

I do not believe TI sells a logic analyzer.

Regards,