IWR1843BOOST: SOPx Implementation

Takayuki Miyazaki

Part Number: IWR1843BOOST

Hello team,

I received inquiry about SOPx Implementation. According to xWR1843BOOT schematic(https://www.ti.com/lit/zip/sprr370 ), many resistors are implemented, as you know.

Are following resistors really required when setting SOP with switch S1?

R98，R99，R114, R113，R96，R95, R89，R88，R92

I checked “xWR1843BOOT Hardware Design Checklist (https://www.ti.com/lit/zip/spracl2 ), I noticed the following descriptions.

1) SOP0 (pin# J1) : Pull to VIO via 10K resister

2) SOP1 (pin# P11): Pull to GND via 10K resister. 3) Ability to pull it to VIO for debug.

3) SOP2 (pin# P13): Pull to GND via 10K resister. Ability to pull it to VIO for flashing.

To avoid miss, Could you elaborate this implementation, please?

A quick response is appreciated!

Best regards,

Miyazaki

over 5 years ago

0 CHETHAN KUMAR Y.B. over 5 years ago

TI__Mastermind 25835 points

Miyazaki-san,

Thank you for detailed check done on the SOP lines.

Yes there are multiple resistors options are provided to have multiple paths to control the SOP lines. i.e. we have options from switch and external MCU coming from LP/BP connectors. If you don't plan to drive from external MCU then you could choose to ignore SOP assertions from R101 for SOP2, R112 for SOP0 and R93 for SOP0.

A series 10k resistor is provided to protect the I/O (Current limit) from multiple drivers driving the I/O.

Strong pull up 7.8K is provided when it's connected to supply with the resistor divider, SOP line would detect high during the boot, Weak pull down (82.5k) is provided when pull up is disconnected a low value is detected.

Thanks and regards,

CHETHAN KUMAR Y.B.

0 Takayuki Miyazaki over 5 years ago in reply to CHETHAN KUMAR Y.B.

TI__Genius 10120 points

Hi CHETHAN ,

Thank you for kind comments on this. I shared this information with customer. I'd like to wait for their feedback for a while.

Best regards, Miyazaki

0 CHETHAN KUMAR Y.B. over 5 years ago in reply to Takayuki Miyazaki

TI__Mastermind 25835 points

Miyazaki-san,

Sure. Thank you for your confirmation.

Thanks and best regards,

CHETHAN KUMAR Y.B.

0 Takayuki Miyazaki over 5 years ago in reply to CHETHAN KUMAR Y.B.

TI__Genius 10120 points

Hello CHETHAN,

I received their feedback. customer was able to understand it.

Thank you very much for your help.

best regards, Miyazaki

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IWR1843BOOST: SOPx Implementation