Datasheet

AN3134 Demonstration board description
Doc ID 16960 Rev 1 3/10
Figure 2. EVAL6229QR demonstration board pin locations
The decoding logic integrated in the device is a combinatory logic which provides the
appropriate driving signals for the three-phase bridge outputs, based on the signals coming
from the three hall sensors H1, H2 and H3. The hall sensors detect rotor position in a 3-
phase BLDC motor.
The EN pin connected to the diagnostic output DIAG is used to implement the overcurrent
and thermal protection.
To perform PWM current control, an analog reference voltage should be provided at the
VREF pin. A fixed reference voltage can be easily obtained through a resistor divider from
an external voltage rail and GND (possibly that which supplies the microcontroller or the rest
of the application). Alternatively, a very simple way of obtaining a variable voltage without
using a DAC is to low-pass filter the PWM output of a microcontroller.
Table 2 summarizes the electrical specifications of the application, Figure 3 shows the
electrical schematic, and Table 3 provides the component list.