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MTD6505
4.7
Internal Voltage Regulator
V BIAS voltage is generated internally and is used to
supply internal logical blocks. The V BIAS pin is used to
connect an external decoupling capacitor (1 μF or
higher). Notice that this pin is for IC internal use, and is
not designed to supply DC current to external blocks.
4.8
BEMF Coefficient Setting
Km is the electro-mechanical coupling coefficient of the
motor (also referred to as “motor constant” or “BEMF
constant”). Depending on the conventions in use, the
exact definition of Km and its measurement criteria can
vary among motor manufacturers. To accommodate
various motor applications, the MTD6505 provides
options to facilitate diverse BEMF coefficients.
The MTD6505 defines BEMF coefficient (Km) as the
peak value of the phase-to-phase BEMF voltage,
normalized to the electrical speed of the motor. The
following table offers methods to set the Km value for
the MTD6505 device.
TABLE 4-2:
Km SETTINGS
Km
Option
Km (mV/Hz) Range
Phase-to-Phase
Min Max
R PROG
Km0
Km1
Km2
Km3
3.25
6.5
13
26
6.5
13
26
52
GND
24 k ?
3.9 k ?
V BIAS
The R PROG sensing is actually a sequence that is con-
trolled by the firmware. For any given R PROG , the inter-
nal control block will output the corresponding Km
range.
DS22281A-page 10
? 2011 Microchip Technology Inc.
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