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CCS Touch Display 4.3" Development Kits
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temtronic



Joined: 01 Jul 2010
Posts: 7975
Location: Greensville,Ontario

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PostPosted: Fri Feb 05, 2021 6:27 am     Reply with quote

The ST2378 does have +5 on port B, the user I/O side, PortA is connected to the PIC, and 3 volts.

What's kinda scary is that 'power in' (9 volt barrel plug) IS connected to the 10 pin 'DIO ' connector pins 1(gnd) and 2( +9).
Sure hope the ST2378 can take the occasional +9 on portb !

OUCH ! downloaded the datasheet, says +7 MAX so...I can see the ST2378 producing 'magic black smoke' if you miswire the 10 pin IDC connector...

There are no pullups on the DIO pins..


Jay
Ttelmah



Joined: 11 Mar 2010
Posts: 16935

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PostPosted: Fri Feb 05, 2021 8:13 am     Reply with quote

Where is the OE connected to?.

The ST2378, won't give an output till this is enabled. Has to be taken high to
enable the chip.
temtronic



Joined: 01 Jul 2010
Posts: 7975
Location: Greensville,Ontario

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PostPosted: Fri Feb 05, 2021 8:15 am     Reply with quote

OE is tied to VB and +5V
Ttelmah



Joined: 11 Mar 2010
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PostPosted: Fri Feb 05, 2021 8:23 am     Reply with quote

OK. So it is permanently enabled then. OE is 5V tolerant.
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