TMS320F28035: 28034 vs 28035 Differences and CPU schematic review

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.

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.

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