Q:
Does Melexis have a controller for 240V DC brushless motor. What I saw in Melexis only supports up to 40V.
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A:
No, Melexis does not have controllers for 240V DC applications.
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A:
A new application note and evaluation board is in the makes that can operate at battery voltages higher than 18V.
This is planned for release Sept/Oct 09.
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Q:
I am using the MLX10407 now, but I don't know how to transform the angle value to digital from the datasheet.
For instance,how to transform the 45.5 degree to 10 bits data.
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A:
This is explained on page 8 of the datasheet.
The principle:
- binary value 0000000000 corresponds to 0 degree
- binary value 1111111111 corresponds to 89.8 degree
For other values you do a linear interpolation, f.e.:
- 45.5 degree is 1000000000
- 30.0 degree is 101010101
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Q:
I have a few questions about the chip else.I read that the lsb isn't used from the datasheet,but the data is ten bits in your example.How much is the angle corresponded per bit?Because the result I calculate isn't a integer,how to fix quantity the relationship?
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Q:
The angle value is defined by a 9 bit word for angles between 0 and 90 degrees. The quadrant is defined by additional bits.
This angle value is transfered to 2 PWM signals, representing the sine and cosine of the requested angle. Also these PWM values have a 9 bit resolution.
This means that, considering the electronics, you have a 9 bit precision, and 1 LSB corresponds to 90/512 degrees.
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Q:
Can the MLX81200 be used in a dc24v/100A sensorless bldc motor application with include FG outout/thermal detected shutdown function?
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A:
The MLX81200 is originally designed for only 12V applications, not 24V.
A workaround is in the makes. Official release is planned for Sept/Oct 09.
The MLx81200 includes an embedded Flash controller. FG output and thermal shutdown can all be implemented in software.
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Q:
Is there a MLX81XXX datasheet available?
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A:
This generic product reference serves as indication of a range of standard products that will be coming on the market in the near future, similar to MLX81100 for DC motor control, and to custom designed ASICs.
So it does not refer to a specific product as such.
Please contact our nearest sales representative to explain your application requirements. In some cases you can be selected as lead customer for products that are not yet officially released to the public.
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Q:
In regards to the MLX90804, can these be purchased preprogrammed and ready to install?
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A:
These parts cannot be preprogrammed.
For development you may use EEPROM version of the chip and mlxspi-programmer. This version can be preprogrammed. It is in a 14 pin package.
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