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MSP430 SPI Communication Problem w/ TRF7960

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Sedat-G

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Hi all,

I am having problem with communication between TRF and MSP430. The software gets stuck when

while(!(IFG2&UCB0IFG))

command line is proceed. Then I decided to observe clock signals between TRF and MSP430.
I have two TRF ICs which behave different under different suplly voltages.:

The first TRF circuit under 5v supply voltage,
@SYS_CLK : 107KHz clock signal with 3V amplitude,

under 3V supply,
@SYS_CLK : 60Khz clock signal with 2.2V ampltide.

If I connect programmed microcontroller to the TRF IC (with EN pin = HI: If EN is HI the clock signal is 3.39MHz - this is defined in datasheet) the clock signal becomes 3.39MHZ signal with 50V amplitude (?!!!) and DATA_CLK is observed as noise.

For the second one,
under 5V : SYS_CLK signal is 60KHz with 5V amplitude
under 3V: SYS_CLK signal is 60KHz with 3V amplitude.

I did not connect this to microcontroller because some pins are not soldered.



So,

Somehow MCU is not communicating with TRF because there is no DATA_CLK signal and is this because of the strange clock signal that I observed like 50V, 3.39MHz signal.

Can someone tell me what the problem is and why I see different clock signals when microcontroller is connected?

Do you think if the TRF is broken somehow???
 

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