Driving the TUSB3410 clock with the 12Mhz calibrated DCO of MSP430F2274?

Michele Bellin

Other Parts Discussed in Thread: MSP430F2274, TUSB3410

Hi,

I am going to interface the MSP430F2274 with the TUSB3410 which requires a 12Mhz clock. Can I use the MSP430F2274 12Mhz calibrated DCO generator to drive the TUSB3410 clock via the SMCLK output of the MSP430? The nominal 12Mhz DCO Calibrated clock can vary between 11.64 - 12.36 Mhz. Is this stabiliy sufficient to guarantee a 9600 baud?

This is because I am already using the XIN/XOUT pins of the MSP for a 32.768Khz XTAL used by ACLK.

Best regards,

Michele

over 14 years ago

0 JMMN over 14 years ago

TI__Guru 60870 points

Hi Michele,

The TUSB3410 specifies a 100 ppm on its clock input. While the TUSB3410 can operate reliably outside that range, we cannot guarantee it's operation with a clock source that far out of the stated spec.

Regards,

Julie Nirchi

0 Joerg Quinten over 14 years ago in reply to JMMN

Guru 17650 points

Hi Michele,

maybe you want to refer to this application note http://focus.ti.com/mcu/docs/litabsmultiplefilelist.tsp?sectionId=96&tabId=1502&literatureNumber=slaa276a&docCategoryId=1&familyId=342. It covers USB connectivity for the MSP430F2274 connected to TUSB3410 (HW and SW proposal).

Rgds
aBUGSworstnightmare

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Driving the TUSB3410 clock with the 12Mhz calibrated DCO of MSP430F2274?