Keep it cool with this multifunction fan shim. Note I just made a correction to the fixed resistor value. My problem is that I don’t really know what the Vref, control, sync and home pins do in this cirucit and what they connect to Also from the L datasheet: Unicorn Meta Zoo 9:

l297 datasheet

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Email Required, but never shown. Output of the on-chip chopper oscillator. This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. A little 8 pin DIP that can be hacked into a light or line following robot known as the “Herbie”.

L297 Stepper Motor Driver IC

Vref is set by a voltage divider to a voltage equal to the peak current multiplied by the value of the current sense resistor s. A failure of the L often results in a failure of the L and could be why it is getting hot.

My l2297 is what are those pins in charge of, their job and what should I connect them to? If you are building a single motor driver on your board, you can leave this pin disconnected. How do we handle problem users? The dtaasheet typically 50mA could be as much as 80mA from the supply.


If you can’t find 40k Ohm, use the next larger value or a combination of 2 resistors. The other end of the potentiometer goes to GND.

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The wiper of the potentiometer goes to the Vref pin. The SGS Thompson LD is one of the most common motor driver chips, with built-in protection from dataasheet abuse motors can create. Since the phase are generated internally the burden on the microprocessor, and the programmer, is greatly reduced. Spehro Pefhany Spehro Pefhany k 5 5 gold badges silver badges bronze badges.

l297 datasheet

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One end of the potentiometer goes to the 40k Ohm resistor I recommend the CW pin of the daatsheet. You can use the schematic I provided for an adjustable output.

My problem is that I don’t really know what the Vref, control, sync and home pins do in this cirucit and what they connect to It can be useful to make this signal jumper-selectable as sometimes switching transients on the Vsense voltages can cause the chopper to function at a frequency that is dtaasheet division of the desired chopper datashee and resulting in an audible hissing sound from the motor. Tut Tut 3, 1 1 gold badge 16 16 silver badges 29 29 bronze badges.


l297 datasheet

Changing the control mode will often eliminate this. The fixed resistor I chose will limit the max adjustable phase current to 2A.

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arduino – Trouble with L pins – Electrical Engineering Stack Exchange

Home Questions Tags Users Unanswered. Note I just made a correction to the fixed resistor value. However my L heats up datasgeet quickly whenever I test the circuit so I suspect it is because of those pins. Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. Remember Me Forgot Your Password? Active 2 years, 3 months ago.

l297 datasheet

Page 8 of the datasheet shows how this is used. When the phase lines are chopped the non-active phase line of each pair AB or CD is activated rather than interrupting the line then active. Not connecting the Vref pin can cause your driver to burn out.