TMS320F28035: 28034 vs 28035 Differences and CPU schematic review

William Szatkiewicz

Part Number: TMS320F28035
Other Parts Discussed in Thread: TMS320F28034, , TMS320F28015, TMDSDOCK28035

Hi,

1. Can you please advise the differences between the TMS320F28034 and TMS320F28035? Also, are they pin and package compatible?

2. Can you please review the attached schematic of the CPU and advise if all Power, GND, JTAG, and connection lines look correct?

Please let me know if you have any questions. I look forward to your response.

Thank you,
William

over 3 years ago

0 Hareesh Janakiraman over 3 years ago

TI__Guru* 95315 points

William Szatkiewicz said:
1. Can you please advise the differences between the TMS320F28034 and TMS320F28035?

Presence/absence of the CLA. Please refer to table 5-1 in www.ti.com/lit/sprs584.

William Szatkiewicz said:
Also, are they pin and package compatible?

They are both available in similar packages and for a given package, they are pin-compatible. Again, refer to Table 5-1.

William Szatkiewicz said:
2. Can you please review the attached schematic of the CPU and advise if all Power, GND, JTAG, and connection lines look correct?

You may want to consider a R-C circuit on the -XRS pin as opposed to just a R. You may also want to look into lowering the resistor for -TRST pin. The datasheet suggests 2.2K. If your JTAG debug probe can live with it, you could attempt to go lower. Excess noise on the -TRST pin can put the device into some unknown state during operation.

0 William Szatkiewicz over 3 years ago in reply to Hareesh Janakiraman

Prodigy 120 points

Hi Hareesh,

Thank you for the reply.

I have used the TMS320F28015 in the past, I don't recall that device having a CLA. Can you please confirm the 28015 does not have the CLA?

Adding an RC to the -XRS pin is a good idea. Will that help keep the -XRS pin low a little longer if needed to help prevent glitches on power up?

I will lower the resistor on the TRST pin, thank you.

Thank you,
William

0 Hareesh Janakiraman over 3 years ago in reply to William Szatkiewicz

TI__Guru* 95315 points

William Szatkiewicz said:
Can you please confirm the 28015 does not have the CLA?

It does not.

William Szatkiewicz said:
Will that help keep the -XRS pin low a little longer if needed to help prevent glitches on power up?

It would aid that. Note that the reset duration during power-up is determined by the power-on-reset (POR) circuit.

0 William Szatkiewicz over 3 years ago in reply to Hareesh Janakiraman

Prodigy 120 points

Hi Hareesh,

1. Can you please recommend a 14-pin JTAG debugger/emulator that provides isolation for the TMS320F28034PNT?

2. Can you recommend an evaluation board/kit for the TMS320F28034PNT?

Thank you,

William

0 Hareesh Janakiraman over 3 years ago in reply to William Szatkiewicz

TI__Guru* 95315 points

William Szatkiewicz said:
1. Can you please recommend a 14-pin JTAG debugger/emulator that provides isolation for the TMS320F28034PNT?

Please check the following resources for isolated JTAG debug probes (we don’t call them “emulators” anymore):

https://www.mouser.com/datasheet/2/190/jet_c2000-1913.pdf

https://www.blackhawk-dsp.com/store/

Unfortunately, Spectrum Digital, the company that made isolated JTAG probes went out of business recently. However, you may still be able to buy their probes online. Another option you may want to look at is https://www.ti.com/tool/TMDSCNCD28035ISO.

William Szatkiewicz said:
2. Can you recommend an evaluation board/kit for the TMS320F28034PNT?

https://www.ti.com/tool/TMDSDOCK28035

0 William Szatkiewicz over 3 years ago in reply to Hareesh Janakiraman

Prodigy 120 points

Hi Hareesh,

That was helpful, thank you. I hope I can find a debug probe, the links will hopefully point me in the right direction. The TMDSDOCK28035 looks good, what does that plug into? I assume I need to order both?

Thank you,

William

+1 Hareesh Janakiraman over 3 years ago in reply to William Szatkiewicz

TI__Guru* 95315 points

TMDSDOCK28035 includes the Controlcard and the docking station. Please look at the 4th photograph in the ordering page.

0 William Szatkiewicz over 3 years ago in reply to Hareesh Janakiraman

Prodigy 120 points

Hi Hareesh,

Can you please confirm that the TMS320F28034 is recommended for new designs and will continue to be supported, manufactured, and available?

Thank you,

William

+1 ChrisClearman over 3 years ago in reply to William Szatkiewicz

TI__Guru** 118410 points

Yes, TMS320F2803x series will continue to be manufactured in high-volume. It is one of our best selling devices with Industrial and Automotive demand expected for a very long time.

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TMS320F28035: 28034 vs 28035 Differences and CPU schematic review