Rentron Encoder

[Bruce]

The CIP-8E encoder is a parallel encoder IC designed for push-button
switches.

You could of course use a PIC to replace the push-button switches if you
like, but there's no way to send this encoder serial data via a single I/O-pin.

[Nitrous]

I'm looking at your site. I'm extremely space limited with my XTMR setup.
What I'm in need of is a single RCVR with multiple XTMR's that can be identified when active. Only one transmitter will be active at a time.

Could I simply put a switch on an encoder data line and when activated, that encoder/XTMR combination will cause the same data line on the decoder to go high and turn on an LED?

Will the chip function with a 3.7v LiPo source? I'm likely limited to 100mAh capacity power source, for both encoder and XTMR.

Thanks,
Doug

[Ioannis]

If you refer to CIP-8 chip, as the data sheet indicates, it work from 3 to 5.5 volts. So, yes, 3.7 is fine.

Now regarding the transmitter, you can find modules that work from 1.8 up to 5.5 volts. Bruce does have such modules (don't know if they are from 1.8 or 3). I have found from Dorji.com modules that are working from 1.8 volts and up to 17dbm power @5V.

What you are asking is easy to do, and since you don't want to identify each transmitter, every one transmitter will have the same ID.

Your switch will be controling the power to the whole transmitter circuit, so when the switch is open, you current drain will be zero.

On the receiver side, the current will be in the range of 10-15mA, so I suppose your battery will not last for very long. You want a line power supply, or much bigger bat.

What is your location, USA?

Ioannis

[Nitrous]

Thanks for replying.
I'm in Canada.

The space constraints on the receiver side of things is quite a bit more forgiving. I could use a 1000mAh LiPo without problems.

It looks like the standby current requirements of the encoder are pretty low so that might be the way to go.
Are there SMD versions of the encoder/decoder?
Thanks again for your comments.
Doug

[Nitrous]

One question about the CIP chip series relates to the role that the address pins.
I understand that these pins must not float. I also understand that the encoder and decoder addresses must be the same (at least that is my belief). Does it allow more than one set of remotes operate on the same frequency?

Doug

[Ioannis]

All transmitter operate on the same frequency. The regulations require that the duty cycle be very low, depending on the band from 0.1 to 10%.

So, as long as only one trasnmitter is ON, there is no problem. That's why you can unlock your car, when all the cars and remote door controlers are on the same channel.

Regarding the SMD or DIP case, I suppose you have to call Bruce and ask him.

Ioannis

[Nitrous]

All transmitter operate on the same frequency. The regulations require that the duty cycle be very low, depending on the band from 0.1 to 10%.

So, as long as only one trasnmitter is ON, there is no problem. That's why you can unlock your car, when all the cars and remote door controlers are on the same channel.

Regarding the SMD or DIP case, I suppose you have to call Bruce and ask him.

Ioannis

Is rentron still operating? I've called a few times and only get voicemail. No response to an email.
I'm off to Washington, DC next week and would like to order a few CIP-8 chips to collect on Friday but time is running out. May have to go with PT2262/72 chips.
Doug