MTD6508_17 Datasheet, PDF (11/18 Pages) Microchip Technology – 3-Phase BLDC Sensorless Fan Controller Demonstration Daughter Board

MTD6508 3-PHASE BLDC SENSORLESS
FAN CONTROLLER DEMONSTRATION
DAUGHTER BOARD
Chapter 2. Installation and Operation
2.1 GETTING STARTED
In order to use the MTD6508 Daughter Board, follow the steps below:
1. Connect a power supply between V_DD and a GND connector on the daughter
board (see Figure 2-1). The device maximum voltage on V_DD is 5.5V. The power
supply should support up to 800 mA continuous (device current limitation is
750 mA). Please note that it is possible that applications may not need that much
current to run at full speed.
2. Connect a 3-phase BLDC fan on Outputs 1, 2 and 3 of the daughter board.
3. Connect a function generator on the PWM pin in order to modulate the input volt-
age in order to adjust the maximum speed of the fan; this step is optional. If the
PWM is left open, the IC will act as if PWM = 100%. This a duty cycle modulation.
This signal frequency range is from 1 kHz to 100 kHz. The maximum voltage on
this signal is V_DD.
4. Connect a frequency meter on the FG pin in order to measure the speed signal;
this step is optional. The signal frequency is gives the electrical speed in RPM.
This is an open-drain signal, pulled up by the resistor, R1.
Please see the “MTD6508 Data Sheet” (DS20005359) for more information on pin
specifications.
2.2 USING THE MTD6508 DEMONSTRATION BOARD KIT WITH THE MTD6508
DEMONSTRATION BOARD SOFTWARE GUI
The MTD6508 Demonstration Board Software GUI provides several features, such as
V_DD control and monitoring, Pulse-Width Modulation (PWM) control, as well as speed
and current consumption monitoring. The MTD6508 Demonstration Board Software
GUI allows the user to control the following parameters:
• The R_PROG resistor value for fan fitting
• The R_SR resistor value for output slew rate control for all remaining digital pins
 2016 Microchip Technology Inc.
DS50002515A-page 11