TDC7201: can't get intb1 and intb2 when tdc get stop signals

jianchun yao

Part Number: TDC7201

When I use TDC7201, I can not get the intb1 and intb2 signal, they do not change low when I send tdc stop signals, why? What is the problems maybe? My pulse width is 40ns, and I checked the Chapter 6 Specification, I use FPGA to control TDC7201, and I can see trigg signal change low when I give it Start signal. The relevant register use the default values. The reset value is one Stop mode,right? Please reply me. Why can't I get the intb signal rightly? Below is my signal tap ii picture for reference. My start and stop is generated by FPGA. FPGA clock is 40 ns.Thank you!

over 7 years ago

0 Bharat Aravamudhan over 7 years ago

TI__Genius 11015 points

Hi,

I have received your question & I will respond to your question by this week.

0 jianchun yao over 7 years ago in reply to Bharat Aravamudhan

Prodigy 60 points

Hi,
You told me you would reply my question last week, but it's been a week.
Please help me, thank you!

0 Bharat Aravamudhan over 7 years ago

TI__Genius 11015 points

Hi Jianchun,

I can a few reasons for not getting a toggle in INTBx pins explained as below:

1. Please make sure that the pin is not tied to a power source directly, have a 10k ohm pull-up resistor.
2. After the last STOP trigger has been received, the TDCx will signal to the MCU through interrupt (INTBx pin) that there are new measurement results waiting in the registers, please check if you have received all the STOPs signals as expected.

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TDC7201: can't get intb1 and intb2 when tdc get stop signals