Do trim pins need to be connected
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I'm hooking up a couple ICs to my BS2, an opamp Burr Brown OPA27, a REF102,
and a INA101, can I leave the offset trim pins disconnected?
Or should you follow Forrest Mims advice and
hook up all unused pins to either Vcc or Vss.
The INA101 has pins called sense, do these need
to go to Vcc or Vss.
The whole idea is to get some strain gage output and A to D it with a
LTC1298 and have the BS2 do different things with digital data
with the branch command.
Thanks,
Mark
Original Message
From: Robert Murphy <bertha@m...>
To: basicstamps@egroups.com <basicstamps@egroups.com>
Date: Sunday, January 21, 2001 5:58 AM
Subject: [noparse][[/noparse]basicstamps] Dual H-Bridge
>Has anyone used the" Maxi Dual H-Bridge Motor Driver Kit" from
>Mondo-tronics?
>If so , could you give me a little of your code to start me off ?
>
>thanks
>
>
>
>
>
and a INA101, can I leave the offset trim pins disconnected?
Or should you follow Forrest Mims advice and
hook up all unused pins to either Vcc or Vss.
The INA101 has pins called sense, do these need
to go to Vcc or Vss.
The whole idea is to get some strain gage output and A to D it with a
LTC1298 and have the BS2 do different things with digital data
with the branch command.
Thanks,
Mark
Original Message
From: Robert Murphy <bertha@m...>
To: basicstamps@egroups.com <basicstamps@egroups.com>
Date: Sunday, January 21, 2001 5:58 AM
Subject: [noparse][[/noparse]basicstamps] Dual H-Bridge
>Has anyone used the" Maxi Dual H-Bridge Motor Driver Kit" from
>Mondo-tronics?
>If so , could you give me a little of your code to start me off ?
>
>thanks
>
>
>
>
>
Comments
For the REF02 and OPA27, you leave the trim pins float for most apps. Do
NOT tie them hi or lo. Forrest Mims' advice applies to unused logic-IC
input pins. I couldn't find data on the 1NA101 ... what is it, and who
makes it?
Ray McArthur
Original Message
From: techno masai <plunkettm@e...>
To: <basicstamps@egroups.com>
Sent: Sunday, January 21, 2001 11:36 AM
Subject: Re: [noparse][[/noparse]basicstamps]Do trim pins need to be connected
> I'm hooking up a couple ICs to my BS2, an opamp Burr Brown OPA27, a
REF102,
> and a INA101, can I leave the offset trim pins disconnected?
>
> Or should you follow Forrest Mims advice and
> hook up all unused pins to either Vcc or Vss.
>
> The INA101 has pins called sense, do these need
> to go to Vcc or Vss.
>
> The whole idea is to get some strain gage output and A to D it with a
> LTC1298 and have the BS2 do different things with digital data
> with the branch command.
The INA101 is an instrument amp made by Burr Brown, here's a link to the
pdf.
http://www-s.ti.com/sc/psheets/sbos133/sbos133.pdf
It seems like a really cool IC to me, I tried hooking it up with 12v and 250
ohm resistors instead of the 357 ohm resistors, but only got -11.6v on the
output, used a 470 gage resistor.
I'm having trouble finding a +15, -15 pwr supply, am thinking about using a
couple of 5v to +-15v DC/DC converters like these.
http://www-s.ti.com/sc/psheets/sbvs012a/sbvs012a.pdf
Thanks Ray.
Mark
Original Message
From: Ray McArthur <rjmca@u...>
To: basicstamps@egroups.com <basicstamps@egroups.com>
Date: Sunday, January 21, 2001 10:35 AM
Subject: Re: [noparse][[/noparse]basicstamps]Do trim pins need to be connected
>Hi Mark,
>For the REF02 and OPA27, you leave the trim pins float for most apps. Do
>NOT tie them hi or lo. Forrest Mims' advice applies to unused logic-IC
>input pins. I couldn't find data on the 1NA101 ... what is it, and who
>makes it?
>
>Ray McArthur
>
>
Original Message
>From: techno masai <plunkettm@e...>
>To: <basicstamps@egroups.com>
>Sent: Sunday, January 21, 2001 11:36 AM
>Subject: Re: [noparse][[/noparse]basicstamps]Do trim pins need to be connected
>
>
>> I'm hooking up a couple ICs to my BS2, an opamp Burr Brown OPA27, a
>REF102,
>> and a INA101, can I leave the offset trim pins disconnected?
>>
>> Or should you follow Forrest Mims advice and
>> hook up all unused pins to either Vcc or Vss.
>>
>> The INA101 has pins called sense, do these need
>> to go to Vcc or Vss.
>>
>> The whole idea is to get some strain gage output and A to D it with a
>> LTC1298 and have the BS2 do different things with digital data
>> with the branch command.
>
>
>
>
>
>
I took a quick look at those links. The INA101 can have the offset pins
open for most apps. The Gain-sense pins are jumpered to the Gain-set pins
as shown on the 1st page of the data sheet. They only spec it for +/-15
volts, so I guess you are stuck with those voltages.
The DC-DC units might work, but, being switchers, they are noisier than
linear supplies, which could give you problems in this kind of sensitive
circuit. I would look for a linear. Have you checked out surplus houses
like Marlin P Jones? Sometimes you can find wall-plug linear regulated
supplies.
Good luck,
Ray McArthur
Original Message
From: techno masai <plunkettm@e...>
To: <basicstamps@egroups.com>
Sent: Sunday, January 21, 2001 1:48 PM
Subject: Re: [noparse][[/noparse]basicstamps]Do trim pins need to be connected
> Hi Ray,
>
> The INA101 is an instrument amp made by Burr Brown, here's a link to the
> pdf.
>
> http://www-s.ti.com/sc/psheets/sbos133/sbos133.pdf
>
> It seems like a really cool IC to me, I tried hooking it up with 12v and
250
> ohm resistors instead of the 357 ohm resistors, but only got -11.6v on the
> output, used a 470 gage resistor.
>
> I'm having trouble finding a +15, -15 pwr supply, am thinking about using
a
> couple of 5v to +-15v DC/DC converters like these.
> http://www-s.ti.com/sc/psheets/sbvs012a/sbvs012a.pdf