[time-nuts] new tdc from Texas

[Poul-Henning Kamp]

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In message <BLU170-W50577ECF0B24FA2BCEFC50CE1E0 at phx.gbl>, Mark Sims writes:

>Sparkfun is selling a board (around $15) based on the STM VL6180
>chip that measures distance based upon time-of-flight of pulses
>from an on chip (or at least in-package) VCSEL IR laser.   Claims
>to have a range of 0 .. maybe 30 cm.   Unfortunately it doesn't
>look like you can directly access the time interval measurement
>portion of the chip.

It doesn't measure time interval, it measures frequency.

These devices contain an oscillator where the flight of the light pulse
is the delay element, then measure the resulting frequency.

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