- Sat Sep 26, 2009 5:27 pm
#81845
Hi all
I'm trying to use an SN754410E to provide bidirectional control of two small DC motors. The motors have noise-elimination capacitors. My application provides 5VDC from a voltage regulator and "raw" power from a ~6VDC battery pack.
I've hooked up and tested each side of the SN754410 and am seeing the same behavior on each, so I am pretty sure that it is me. I've tried two different ICs so I don't think that it is a defective/fried chip.
Summary: all 4 motor outputs always read Vin from pin 8
Here is my circuit at a point where I am trying to test with just one motor:
Pins 1,9,16 - +5VDC
Pins 3,6 - Output to motor 1
Pins 4,5.12,13 - Ground
Pin 8 - Vin from the battery pack
By my understanding, with pins 2 and 7 LOW there shouldn't be any current on 3,6 - but when I check them with my meter, they both have Vin
So, I connected Pin 2 to +5VDC - same thing, both outputs show Vin
For completeness, I connected Pin 7 to +5VDC - same thing.
Thanks in advance,
---Raymond
I'm trying to use an SN754410E to provide bidirectional control of two small DC motors. The motors have noise-elimination capacitors. My application provides 5VDC from a voltage regulator and "raw" power from a ~6VDC battery pack.
I've hooked up and tested each side of the SN754410 and am seeing the same behavior on each, so I am pretty sure that it is me. I've tried two different ICs so I don't think that it is a defective/fried chip.
Summary: all 4 motor outputs always read Vin from pin 8
Here is my circuit at a point where I am trying to test with just one motor:
Pins 1,9,16 - +5VDC
Pins 3,6 - Output to motor 1
Pins 4,5.12,13 - Ground
Pin 8 - Vin from the battery pack
By my understanding, with pins 2 and 7 LOW there shouldn't be any current on 3,6 - but when I check them with my meter, they both have Vin
So, I connected Pin 2 to +5VDC - same thing, both outputs show Vin
For completeness, I connected Pin 7 to +5VDC - same thing.
Thanks in advance,
---Raymond