diff --git a/README.md b/README.md index 500566b..1e1206b 100644 --- a/README.md +++ b/README.md @@ -20,7 +20,7 @@ * Logic HIGH on BOTH pins makes the motor ACTIVELY **BREAK** (M+ becomes GND, M- becomes GND) * Logic LOW on BOTH pins makes the motor **FREESPIN** (M+ floats, M- floats) -## "Analog" control +### "Analog" control * The power of the motor can be precisely adjusted (0-100%) by applying a PWM SQUARE WAVE to the FORWARD/REVERSE pins * Recommended PWM frequency: 100Hz - 5KHz * Max frequency: 30KHz @@ -35,7 +35,7 @@ # PCB assembly / component configurations -## For Voltage 3-18V and Current 0-5A (basic configuration) +### For Voltage 3-18V and Current 0-5A (basic configuration) ![](images/soldering.jpg) * Populate the TMI8260 (duh!). Note where pin 1 (marked) goes! * Populate '2x10uF' with included ceramic capacitors @@ -43,16 +43,16 @@ * Skip the additional flyback diodes * This works with PWM frequencies up to 5KHz -## For PWM frequency > 5KHz +### For PWM frequency > 5KHz * If the expected current is low (<3A), you can probably just use the basic configuration * Otherwise, add 4x flyback diodes on the PCB * SS54 or SS34 diodes, in SOD-123L package * They are difficult to solder, sorry! -## For Voltage<10V AND Current<2A: +### For Voltage<10V AND Current<2A: If you don't need the high power of this chip, consider using the DRV8835 module instead. It is cheaper and comes pre-assembled. -## For ONE directional control: +### For ONE directional control: If you don't need bi-directional control, consider just using a N-MOSFET and flyback diode instead. Cheaper, simpler. @@ -61,7 +61,7 @@ The TMI8260/CP2119 has protection features that allow it to protect **ITSELF** * It cannot protect the connected motor/coil - make sure VIN is a voltage that the motor can handle! * It cannot fully protect the power source - make sure it can handle the current the motor will take! -## Overcurrent / short-circuit protection +### Overcurrent / short-circuit protection * If the connected motor / coil attempts to take more than > 9A, overcurrent protection kicks in * The device will stop supplying power for approx 50 microseconds, and let the current drop * After that, the device will automatically retry applying current @@ -69,11 +69,11 @@ The TMI8260/CP2119 has protection features that allow it to protect **ITSELF** * This does protect the power source by limiting the consumed current to approx 9A * This feature relies on the inductance of the connected motor/coil. If the inductance is too low, the safety feature will not have time to react before the current becomes too high. -## Overtemperature protection +### Overtemperature protection * If the TMI8260 gets too hot (>150C) during continuous operation, it will temporarily stop providing power to the load * After cooling down, it will automatically return to normal operation -## Integrated flyback diodes +### Integrated flyback diodes * Inductive loads tend to induct reverse voltages that may damage drive circuitry * The TMI8260 has integrated flyback diodes (inside the chip) that can handle most use cases * The PCB has space for additional external flyback diodes, for more extreme cases (see "Use cases") @@ -109,6 +109,7 @@ The TMI8260/CP2119 has protection features that allow it to protect **ITSELF** ### Extra features * Spots for adding LED indicators for FORWARD and REVERSE signal levels might be neat +* A screw hole or two, for easy monting. Maybe just a single M2 --- Made at [ELAB](http://elab.kth.se) by Marek Baczynski. Find him on the ELAB slack if you have any questions