I have to set both enable pins to high to move the motor with pwm forward or backward. Why?

It's because the BTS7960 is a half-bridge, and the design decision was made to break out both pins for each IC. The datasheet for the BTS7960 IC is useful here. If you read the datasheet, and compare it to the schematic - you'll see that there are three sets of pins, one set for each half-bridge IC. For each, there is a PWM input pin, an _EN pin, and an _IS pin. The nPWM pins (1 & 2) are connected (via the buffer IC) to the IN pin (input - pin 2) of each BTS7960. The n_EN pins (3 &4) are connected (via the buffer IC) to the INH pin (inhibit - pin 3) of each BTS7960. The n_IS pins (5 & 6) are connected (directly, no buffer) to the IS pin (current sense - pin 6) of each BTS7960. Thus, we can see that the "enable" pins are somewhat mislabeled, but likely if left unconnected (high impedance), they "float" (or are interpreted by the BTS7960) to be in the LOW state, which means "go into sleep mode" - so they both must be set to active HIGH to keep both sides of the bridge operational. But you only need to pulse one side or the other (input) bridge to control the motor direction. So why was this decision made? Section 4.3.3 notes that the BTS7960 has an "over-temperature protection mode" that can be reset by bringing the INH (inhibit - n_EN on the module) LOW (put to sleep mode) - so in theory it is possible for a single side of the h-bridge to overheat and go into this mode, which might be detectable by using the current sense line, and if (when you pulse the PWM) you don't get any current - then you know that direction no longer is responding, and you could wait a bit (for the IC to cool off) then drop that line LOW to reset only that side (direction) - if this makes sense...? But doing both at the same time wouldn't be that big of a deal, either... But take a look at the next section of the datasheet (4.3.4), describing current limiting: It seems that when current limits are reached for a bridge (and depending on the slew rate, which is fixed on the module, via a resistor attached to the SR pins (see the schematic - the resistors are R4 and R7) - the switching reverses, and the IN pin on the IC (PWM on the module) is ignored - meaning the other MOSFET switch could be active HIGH, and the only way to turn both of them off is to bring the inhibit pin on the IC (n_EN on the module) from HIGH to LOW. Section 4.4.1 also describes more. Sections 4.4.4 and 4.4.5 are also useful to understand; if you know the status of the current sense output - plus the status of the switch output (HIGH or LOW) - you can use the truth table to determine if you are in an error condition - in which case you can make decisions on what to do, and being able to independently pulse the n_EN pin on the module LOW might be useful. All of that said, the application circuit example in figure 11 seems to indicate that in a full-bridge situation, you would connect both the inhibit pins and the current sense pins together and feed them into the micro-controller; so it doesn't make sense why, in this module, the designers didn't do the same thing, except for one potential reason: If you wanted to, you could use two of these modules to control a stepper motor; for a 4-wire stepper, you would use it just like it is - one module per coil (in which case it still doesn't make sense not to tie the pins together). But for a 6 or 8-wire/pin stepper motor, you might want to control each half of the coils separately. In which case you'd also want both the current sensing pins and the inhibit pins to be broken out separately. I suspect that this is why the pins are broken out separately. If you only use the module as an h-bridge, you can tie them together, via carefully adding a solder bridge to the backside of the header on the PCB, between pins 3 & 4. Then only one pin would be needed.

What is the maximum voltage this will handle?

Max 45 volts DC for the motor side, 5.3 volts DC for the logic side

Did anyone figure out Current Sensing? It gives me 0 during normal operation.

I found the sensing does work, although I needed to add a RC filter (2k, 10 uF) to get any consistent values going into the Arduino ADC inputs. I also changed the Arduino PWM output frequency default from near 1 kHz up to 31 kHz, that way I don't hear the annoying loud whine from the motor when it's in between 0 and full.

How fast can the r_en and l_en be switched back and forth?

Looking at the schematic, R_EN and L_EN drive BTS7960 INH pins (#3). The datasheet describes INH input controls the device's 'sleep mode' but does not provide the timing information you need. On the other hand, R_EN and L_EN control two separate chips so your application (code?) could fine-tune device timing somewhat. If your application needs fast switching times you might consider individual high-side/low-side drivers rather than this h-bridge.

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⚙️ Power your projects with precision and protection — drive smarter, not harder!

PLUG PLAY SIMPLICITY - Only four wires needed (GND, 5V, PWM1, PWM2) for quick, clean integration into your projects.
SEAMLESS MCU ISOLATION - Protect your microcontroller effortlessly with built-in 5V isolation—no more signal interference.
WIDE VOLTAGE COMPATIBILITY - Operate confidently across 6V to 27V, perfect for versatile vehicle and robotics applications.
THERMAL OVERCURRENT SAFETY - Smart Infineon BTS7960 chips provide built-in thermal and current protection for reliable longevity.
UNLEASH 43 A HIGH POWER DRIVE - Dominate your motor control with robust 43A current capacity for heavy-duty performance.

The HiLetgo® BTS7960 is a high-power 43A H-Bridge motor driver module featuring a wide 6V-27V input voltage range, integrated 5V isolation to safeguard your microcontroller, and thermal overcurrent protection. Designed for efficient PWM control with minimal wiring, it’s ideal for advanced vehicle and robotics motor control applications.

Reviews

M**E

Very handy module to have at a great price. I had some trouble trying to use ...

Very handy module to have at a great price. I had some trouble trying to use mine, but I think the problem was with my attached circuitry. The first one I bought is now happily running and the spare waiting for something big to drive (I've checked it works). Having the current sense pins of the drivers available is a nice bonus although I didn't try to use it.Like some other reviews, my first module had one of the driver chips dodgily attached, with a couple of its pins very close together. Easily solved but potentially catastrophic, so check yours over before use. Both modules also arrived with the control headers a little bent as they're shipped in nothing but an anti-static bag. Again easy to fix but also easily remedied by the supplier with a cardboard box.

29.01.2018

S**.

didnt work

appalling solder quality as can be seen from the image - doesn't work as a result

22.05.2019

M**E

Be careful of the heatsink.

The heat sink shorted the board rendering the unit unusable..

4.05.2019

J**7

One Star

DOA.

27.05.2018

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Package Dimensions L x W x H	10 x 6.1 x 5.4 centimetres
Package Weight	0.08 Kilograms
Product Dimensions L x W x H	12.7 x 12.7 x 12.7 centimetres
Item Weight	50 g
Brand	HiLetgo
Colour	Blue
Part number	3-01-0833
Size	Small
Guaranteed software updates until	unknown

HiLetgo® BTS7960 43A H-Bridge PWM Drive High Power Vehicle Motor Drive Module Current Limit

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