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Time-to-Digital converter plug-on module (shield) for Raspberry Pi B+. The board utilizes a TDC7200 (TI) with a time resolution of ~50ps. The Start/Stop inputs to the TDC can be configured by jumpers from either external signals or coming from one GPIO in case a timing signal is present at this pin from another plug-on board on the same RPi.

The design is finalized. PCBs were produced, mounted and tested succesfully.

Note: the input termination can be chosen from the following two options:

  1. series termination: R1,R2 dnm; R4,R5 51 Ohms
  2. parallel termination: R1,R2 51 Ohms; R4,R5 0 Ohms



rpi-tdc pcb


ID Name Designator Footprint Quantity
1 71c1eb400ba34ed299854a1ee2497451 JP1 2X20 1
2 639ab193ed8a4560b202fc6495078b57 U1 TSSOP-14 1
3 a07e734bf246451e86dfff179e17456c U2 CRYSTAL-SMD-5X3 1
4 5fe245ff6b9e475096776d0b6c0998a1 C1,C2,C3 0805 3
5 cc0d4773da54490d9a9590299d970180 X1 SMA90_DIP 1
6 cc0d4773da54490d9a9590299d970180 X2 SMA90_DIP 1
7 14305fcff6fe44d7aa3af50b8ddc6b6d R1,R2,R4,R5 0805 4
8 14305fcff6fe44d7aa3af50b8ddc6b6d R3 0805 1
9 1k R406 0805 1
10 Status LED1 LED-0805 1
11 21f8f80a3f7c3c2b00b33f71a31ff6ef JP2 HDR-3X1/2.54 1
12 14305fcff6fe44d7aa3af50b8ddc6b6d R6,R7 0805 2
13 c9f5a24de7d9962ed69808324826d717 JP3 HDR-2X1/2.54 1


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