1) In tdc7000 datasheet it is mentioned it Supports up to 5 STOP Signals. Does it mean with respective start signal only 10 stop signals can be measured? Can it record TOF of all stop signal till one second with respective same stop signal?
2) Can we synchronize 2 or more tdc7000 ICs with same start signal to measure TOF of more channels simultaneously and obtain timestamp using only one interface?
Hello Rutuj,
The device can support up to 5 stop signals. This is configured by setting the NUM_STOP bits in the CONFIG2 register. Each stop signal is captured and stored in the respective registers. The measurement range is dependent on the mode that is used and are shown below. The max available is in mode 2 at 8ms. The device is intended for very accurate short time measurements.
Yes, you can tie the start pins together on multiple devices to synchronize. The devices can then all use the same SPI bus where they can be read individually. I am not exactly sure what your requirements are, but you may also be interested in the multi-cycle averaging feature of the device. This is described in section 8.4.4 of the datasheet.
https://www.ti.com/lit/ds/symlink/tdc7200.pdf
Last, you can also consider the TDC7201, which offers 2 channels and supports up to 10 stop signals.
Hello Rutuj,
In mode 2, the device can measure up to 5 stops within 8ms.
Each TDC7200 device can only measure up to 8ms in mode 2. The device also has a minimum specification for the time between stop signals which can be seen below. Maximum clock frequency is 16MHz, which will not be fast enough to support 80ps separation between stop signals.
