[TI-H] Re: Calc Port Voltage

To: <ti-hardware@lists.ticalc.org>
Subject: [TI-H] Re: Calc Port Voltage
From: "Cullen Logan" <evilson1@austin.rr.com>
Date: Fri, 16 Aug 2002 09:53:48 -0500
Importance: Normal
In-Reply-To: <E045ACB7-B11B-11D6-8EBB-000502AE8F5B@mac.com>
Reply-To: ti-hardware@lists.ticalc.org

Hey guys you should use 5V with a 2K pull-up resistor, unless your leads
are sufficiently short.  In the TI-Keyboard (www.psikan.com) I use 5V
and everything seems to work fine.  Let me know if you need help in
design.

Regards,
Cullen Logan

-----Original Message-----
From: ti-hardware-bounce@lists.ticalc.org
[mailto:ti-hardware-bounce@lists.ticalc.org] On Behalf Of Adam Thayer
Sent: Friday, August 16, 2002 8:27 AM
To: ti-hardware@lists.ticalc.org
Subject: [TI-H] Re: Calc Port Voltage

On Friday, August 16, 2002, at 04:14 AM, Heiko Rosemann wrote:
> I'd say battery voltage, 'cos I don't think they can make a supply 
> system
> that gives the logic enough voltage to work from around 4V (minimum 
> batte=
> ry
> level) up to 6V (or at least they wouldn't in such a cheap system)

Yep I was wrong (and half-asleep), but I would say it isn't 4.5V 
either... closer to 3V/3.3V, one of which is also commonly used for 
digital applications.

References:

[TI-H] Re: Calc Port Voltage

From: Adam Thayer <krevinek@mac.com>