CC3200: Personal schematic confirmation, please

David__

Genius 3585 points

Part Number: CC3200

Hi, I'm trying to create my custom PCB using the CC3200R1M1RGCR and the XDS100v3 debugger.

I've posted my schematic here.

myPCBv0.1.pdf

I placed PFET for reverse battery protection. I use a 9V battery.

I use a buck converter, a motor driver, and a 6-axis accelerometer via I2C.

I have to use many GPIOs so using the JTAG pins as I2C pins are inevitable. I have to use SWD with XDS100v3.

I have some questions about it.

0) At pin 45 (DCDC_ANA2_SW_P), the CC3200 launchpad does not populate an inductor.

I'm not planning to use the pin 45 as GPIO_31. Should I place an inductor?

1) I removed all the SMA connectors in my schematic. Should I populate one?

2) I noticed that the ADC channels' max input is 1.5V. I placed NFET and PFET for battery level checking by referencing a circuit.

Will that configuration work?

3) Also, is my TI 14 pin JTAG connection is correct?

-Best Regards

over 8 years ago

0 Charles Oladimeji over 8 years ago

TI__Mastermind 33805 points

Hi David,

I am reviewing the schematic and will get back to you tomorrow.

Regards,
Charles O

0 Charles Oladimeji over 8 years ago

TI__Mastermind 33805 points

0) Pin 45 and 46 can be left as NC. Pin 47 can also be left as NC if pin 45 is not used as GPIO
1) You will need to add an RF pigtail later on for certification and testing if the SMA connector is removed.
2)See link below for more info on ADC
processors.wiki.ti.com/.../CC32xx_ADC_Appnote
3) see link below for JTAG info
processors.wiki.ti.com/.../JTAG_(MSP430)

Lastly please see link below for some more general information. The hardware checklist document contains some more recommendations. In addition a pi network is recommendation for impedance matching tuning.
processors.wiki.ti.com/.../CC31xx_&_CC32xx_Hardware_Design_Review

Regards,
Charles O

0 David__ over 8 years ago in reply to Charles Oladimeji

Genius 3585 points

Greetings, Charles.

Charles Oladimeji said:
Pin 45 and 46 can be left as NC. Pin 47 can also be left as NC if pin 45 is not used as GPIO

Like this? I don't use pin 45 as a GPIO.

Charles Oladimeji said:
You will need to add an RF pigtail later on for certification and testing if the SMA connector is removed.

I'm not familiar with the term "RF pigtail". Are you meaning something like this?

I've once soldered an SMA cable like that at the impedance line.

I'm reading about the Wiki parts so it will take a while. In the meantime, the above schematic is valid?

0 David__ over 8 years ago in reply to Charles Oladimeji

Genius 3585 points

One more thing, the XDS100v3 supports ARM JTAG 20 pins.
Do you have link related to this pin configuration?

Come to think of it, I have J-Link. So I should use the ARM JTAG pins to use both XDS100 and J-Link.
Also I have this MDL-ADA2 20-10pin adapter.
www.digikey.com/.../en

In my case, I use the SWD.

0 Charles Oladimeji over 8 years ago in reply to David__

TI__Mastermind 33805 points

1. Yes the schematic snippet is right

2. yes SMA cable like that

Charles O

0 David__ over 8 years ago in reply to Charles Oladimeji

Genius 3585 points

Great, What about the ARM JTAG part mentioned above?

0 Charles Oladimeji over 8 years ago in reply to David__

TI__Mastermind 33805 points

Hi David,

See link below for information on JTAG pin out.

processors.wiki.ti.com/.../JTAG_Adapters

What ever you do, please ensure you have either the 4 wire JTAG or 2 Wire SWD interface routed corrected. You can either use an adapter, jumpers or have this routed directly on your custom board.

Regards,

Charles O

0 David__ over 8 years ago in reply to Charles Oladimeji

Genius 3585 points

Hi, Charles.

This is my revised schematic. I have to use TDI and TDO as I2C pins due to the camera application. So I have to use the SWD.

I have XDS100v3, MDL-ADA2 (20to10 pin adapter), and J-Link Plus.

Can you check my connection, please?

0 Charles Oladimeji over 8 years ago in reply to David__

TI__Mastermind 33805 points

100K pull down recommended on pin #19 (JTAG_TCK)

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CC3200: Personal schematic confirmation, please