Hello,
I'm still working on a project utilising TPIC8101 but have come across something that I cannot interpret without trial-and-error.
"D9 to D8 of digital integrator output followed by six zeros"
1) How is D9:D8 laid out? Left-to-right? right-to-left? right-justified? left-justified?
And another question or two:
2) what is the bandwidth of the bandpass filter?
3) if microcontroller clock frequency is 16 MHz, set OSCin frequency to 16 MHz?
David,
Sorry we dropped the ball on this one. Here is my feedback, this device is new to me and I had to dig up the information.
1) How is D9:D8 laid out? Left-to-right? right-to-left? right-justified? left-justified?
You are correct.
Byte 2: [ D9 D8 0 0 0 0 0 0 ]
Byte 1: [ D7 D6 D5 D4 D3 D2 D1 D0 ]
2) what is the bandwidth of the bandpass filter?
The Q-Factor for this filter is 2.30. Therefore from the center frequency that you set, and the Q-factor I just gave you, you can calculate the bandwidth of the filter.
I used the following website for the above information: http://www.sengpielaudio.com/calculator-cutoffFrequencies.htm
3) if microcontroller clock frequency is 16 MHz, set OSCin frequency to 16 MHz?
You are not calculating anything for this. You are just sending a clock signal into the device between 4MHz and 24MHz and then setting the prescalar with the value you are sending in. Page 13 of the datasheet. You basically are telling the device what the input frequency you are sending in and it will set the internal divider accordingly.
Hope this helps,
John G
