CC2540: CC2540EMK-USB

Hi,
Is there any update?
@Simon J

Hi Ali,

https://www.ti.com/tool/TIDC-CC2540-BLE-USB

Best regards,

Bun

Hi Bun Kuch
Thanks for your reply. Is there Altium design files available because all are pdf.
The 2nd thing, i have some questions regarding a circuit that is utilizing CC2540. I attached the schematic for it.
I need to know that following

1. Should i connect shield pin to GND directly or through ferrite beads?
2. What should ESD protection component i should use for data lines considering it will connect directly with CC2540 pins?

DFR0351sch.pdf

Hi Ali,

Unfortunately, there are no Altium files.

1. Shield pins should be connected to ground.

2. TPD6E004RSE is the ESD protection diode we use for our reference designs and the part we recommended. Please follow this app note for the layout guide when using this part: https://www.ti.com/lit/an/slva680a/slva680a

Best regards,

Bun

Hi Bun Kuch

Thanks for your reply.
I am bit confused about the ESD diode.
The USB supply is 5V and CC2540 is compatible with 3.3V.

What should be the clamp voltages for ESD diode.
I only need ESD protection for datalines and power line.
Also, the shield pins should be connected directly through GND or through some component like Ferrite Bead as shown in the schematic, i sent.
Thanks 

Hi Ali,

1. Below shows the clamping waveform based on the datasheet, but the 5V and 3.3V will work with this ESD diode.

2. Let me verify this with my team.

Best regards,

Bun

Hi Bun Kuch

Thanks again.
I forgot to mention one more thing.
In the schematic, this component has been used.

Is it alternative to the LC filtration circuit used in the datasheet application circuit?

Also, if you check the schematic, i sent you above. They also used LC circuit.
If it is alternative to all those components then i will definitely go with it.

Thanks

Hi Ali,

Regarding the shield pin, please include the inductor to ground to allow any unwanted noise to choked out. Additionally, the part you are referring to is a balun to transform the output impedance of the device to 50 ohms.

Best regards,

Bun

This network also use for the same purpose but with discrete components to lower the cost. Right?

Correct

Hi Bun Kuch
Can you recommend me TVS diode part number plz?
It would be better if it is single channel for routing. I have to connect usb data lines with cc2540.
Also for VCC line of usb port.
Thanks

Hi Ali,

This is ESD Diode we use on our RF line and all reference designs but can also be used on any lines.

TPD1E0B04DPY: https://www.ti.com/product/TPD1E0B04

Best regards,

Bun

Hi Bun Kuch

I am routing a micro usb differential pair but whatever position, i setup cc2540 and usb. It traces always crossover each other.
Can you help me to solve it plz?

That i resolved by using the reverse version of the ucb.
I need pcb design review.
Can you tell me how i can submit it in private for design review?
Thanks

Hi Ali,

Use the link below:

https://www.ti.com/tool/SIMPLELINK-2-4GHZ-DESIGN-REVIEWS

We would be happy to point out any optimization, if any.

Best regards,

Bun