Can the digital inputs on FCS be pullup of down independently?

[garrettbailey]

#17132

Hi, Can the digital inputs on FCS be pullup of down independently?

I saw we need to set PTC8 high for pullup. Is that pulling up all the digital inputs? Is it possible to configure each digital input independently?

In Digitial I/O guide, it says “For the default configuration, the input will read high unless it is grounded, in which case it will read low. When reconfigured with a pull down:
A supplied voltage greater than 2V will result in a high reading.
You can apply a voltage up to the maximum voltage on the ECU (36V)”

What does this mean by default configuration? Is default configuration mean setting PTC8 to high?

[AmirF]

#17140

Hi Garrett,

It depends on the version of the hardware you are using.

On FCS1.1 and older versions of FCS, all the Digital Inputs are pulled high in hardware and there is no software-controlled switch to pull down or float the DIs. In this version, all the DIs will read high(1), unless they get connected to a voltage less than 2V.

On FCS1.2 you can pull up all the DIs by driving PTC8 high. All the DIs will be pulled high together and unfortunately, they are not controllable separately on FCS1.2. However, on FCE2.0 and FCG1.0, which are the newer designs, you will have better control over DI pulls, as there are two separate switches for 12 DIs.

On FCS1.2, if you drive PTC8 high, each DI will read 1, either for a voltage greater than 2V or no external connection. Each DI will only read low (0), if a voltage between GND(0V) and 2V is detected on the DI header pin.

Thanks,
Amir

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