CC2640: Crystal for cc2640

Nitin Kanani

Expert 1015 points

Part Number: CC2640

Hi All

24MHZ external crystal is needed for cc2640_5xD ble?

what is Total current capacity of cc2640_5xD Ble?

what is Maximum current drive capacity of single GPIO for cc2640_5xD ?

Please share me answer as soon possible.

Best Regards

Nitin Kanani

over 9 years ago

0 YiKai Chen over 9 years ago

Guru 735705 points

24MHZ external crystal is needed and you can refer to current drive capacity in Section 11.8 I/O Pin Mapping in CC2640 TRM.

0 Nitin Kanani over 9 years ago in reply to YiKai Chen

Expert 1015 points

CC2640 Ble doent have on-chip oscillator?

0 YiKai Chen over 9 years ago in reply to Nitin Kanani

Guru 735705 points

on-chip oscillator is 32K.

0 Nitin Kanani over 9 years ago in reply to YiKai Chen

Expert 1015 points

cc2640 has 48MHZ on-chip oscillator ? can i use that without using 24MHZ external oscillator?

0 YiKai Chen over 9 years ago in reply to Nitin Kanani

Guru 735705 points

Try to refer to Christin's reply in e2e.ti.com/.../503184

0 YiKai Chen over 9 years ago

Guru 735705 points

A 24MHz crystal is needed for the RF system, and this frequency is internally doubled to 48MHz for use as the system clock. This is explained in section 6.9 of the CC2640 datasheet.

0 Nitin Kanani over 9 years ago in reply to YiKai Chen

Expert 1015 points

Thanks!

0 YiKai Chen over 9 years ago in reply to Nitin Kanani

Guru 735705 points

You are welcome.

0 Nitin Kanani over 9 years ago in reply to YiKai Chen

Expert 1015 points

can i use 32kz on-chip oscillator for RF?

0 YiKai Chen over 9 years ago in reply to Nitin Kanani

Guru 735705 points

No, you can't.

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CC2640: Crystal for cc2640