Hi Jacob,
1/ Test is an unused feature at present, you can treat it like a GPIO
2/ We use an opto-isolator so we don't have to provide a switch to the
external radios PTT circuit. An electro-mechanical relay would have
been an alternative. It's usually a mechanical switch on your PTT mic.
- David
On 08/03/18 00:22, Jacob Falzon wrote:
Hello again,
there are another two pins for the SM1000 that I wanted to know more about.
The Test pin connects to a Self-Test circuit. What exactly is this used
to test for please?
Also there is another pin named CPPT that connects to an optoisolator. I
understand that the CPPT signal is used to trigger the PTT for the radio
but why is the opto-isolator implemented please?
Thank you very much for your attention.
Kindest regards,
On Sat, Feb 24, 2018 at 9:01 PM, Jacob Falzon <[email protected]
<mailto:[email protected]>> wrote:
Thank you very much for your attention.
Have a good night!
On 24 Feb 2018 8:26 PM, "David Rowe" <[email protected]
<mailto:[email protected]>> wrote:
Hi Jacob,
These pins are just broken out as GPIOs or for future expansion.
- David
On 25/02/18 00:54, Jacob Falzon wrote:
Hi there,
i was looking at the schematic and I came upon the SPI pins
and the UART pins in the schematic.
The SPI pins ( SCK, MOSI, MISO, NSS) do not seem to be
connected with an external component. What is their purpose?
Also the UART pins whilst available are they currently
utilised for some purpose?
Many thanks for your kind attention.
Regards,
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