+12V input?

Discussion and support for MoTeC Power Distribution Modules

+12V input?

Postby greenamex2 on Sun Dec 20, 2020 6:47 pm

Hi all

Anyway of triggering a PDM input of a +12V signal without resorting to a pull down resistor?

Thanks in advance
Motec CDL3+M130+LTCD+MDD+PDM15
Nissan VQ30DE fitted to an AM Sportscars EX2 with a Hewland HP 2000
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Re: +12V input?

Postby RR213 on Mon Dec 21, 2020 5:40 am

When configuring the input pins there is the option for active high or active low. For 12v switched inputs use active high.
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Re: +12V input?

Postby greenamex2 on Mon Dec 21, 2020 5:58 am

RR213 wrote:When configuring the input pins there is the option for active high or active low. For 12v switched inputs use active high.


Unfortunately when no 12v signal is present the source isn't pull to ground so the pdm still gets pulled to +12v anyway by the internal pdm pull-up!
Motec CDL3+M130+LTCD+MDD+PDM15
Nissan VQ30DE fitted to an AM Sportscars EX2 with a Hewland HP 2000
greenamex2
 
Posts: 257
Joined: Fri Sep 12, 2014 6:06 am
Location: England

Re: +12V input?

Postby adrian on Mon Dec 21, 2020 7:20 am

The PDM switch inputs were originally designed for pull to ground type switching so unfortunately the only way to wire a 12V switch into the PDM is by adding a pull down resistor.
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Re: +12V input?

Postby greenamex2 on Mon Dec 21, 2020 7:27 am

adrian wrote:The PDM switch inputs were originally designed for pull to ground type switching so unfortunately the only way to wire a 12V switch into the PDM is by adding a pull down resistor.


Thanks for confirming Adrian.

I have managed to work how to fit them inside a Rostra cruise control stalk.
Motec CDL3+M130+LTCD+MDD+PDM15
Nissan VQ30DE fitted to an AM Sportscars EX2 with a Hewland HP 2000
greenamex2
 
Posts: 257
Joined: Fri Sep 12, 2014 6:06 am
Location: England


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