L6235PD 데이터 시트보기 (PDF) - STMicroelectronics
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L6235PD Datasheet PDF : 35 Pages
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Decoding logic
8
Decoding logic
L6235
The decoding logic section is a combinatory logic that provides the appropriate driving of the
3-phase bridge outputs according to the signals coming from the three hall sensors that
detect rotor position in a 3-phase BLDC motor. This novel combinatory logic discriminates
between the actual sensor positions for sensors spaced at 60, 120, 240 and 300 electrical
degrees. This decoding method allows the implementation of a universal IC without
dedicating pins to select the sensor configuration.
There are eight possible input combinations for three sensor inputs. Six combinations are
valid for rotor positions with 120 electrical degrees sensor phasing (see Figure 14, positions
1, 2, 3a, 4, 5 and 6a) and six combinations are valid for rotor positions with 60 electrical
degrees phasing (see Figure 15, positions 1, 2, 3b, 4, 5 and 6b). Four of them are in
common (1, 2, 4 and 5) whereas there are two combinations used only in 120 electrical
degrees sensor phasing (3a and 6a) and two combinations used only in 60 electrical
degrees sensor phasing (3b and 6b).
The decoder can drive motors with different sensor configuration simply by following
Table 7. For any input configuration (H1, H2 and H3) there is one output configuration
(OUT1, OUT2 and OUT3). The output configuration 3a is the same as 3b and analogously
output configuration 6a is the same as 6b.
The sequence of the hall codes for 300 electrical degrees phasing is the reverse of 60 and
the sequence of the hall codes for 240 phasing is the reverse of 120. So, by decoding the 60
and the 120 codes it is possible to drive the motor with all the four conventions by changing
the direction set.
Table 7. 60 and 120 electrical degree decoding logic in forward direction
Hall 120° 1
2
3a
-
4
5
6a
-
Hall 60°
1
2
-
3b
4
5
-
6b
H1
H2
H3
OUT1
OUT2
OUT3
Phasing
H
L
L
Vs
High Z
GND
1 -> 3
H
H
L
High Z
Vs
GND
2 -> 3
L
H
L
GND
Vs
High Z
2 -> 1
H
H
H
GND
Vs
High Z
2 -> 1
L
H
H
GND
High Z
Vs
3 -> 1
L
L
H
High Z
GND
Vs
3 -> 2
H
L
H
Vs
GND
High Z
1 -> 2
L
L
L
Vs
GND
High Z
1 -> 2
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DocID7618 Rev 2
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