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AS5134
Datasheet - D e t a i l e d D e s c r i p t i o n
7.9 Brushless DC Motor Commutation Mode
The BLDC signals will be used to control the electrical angle information – according to the amount of pole pairs and the actual mechanical angle
position. Refer Figure 13 for an example of n_pole_pairs:=2. For the programming, refer to Serial Synchronous Interface (SSI) on page 18 .
Figure 13. Commutation Mode
? electrical := ? mechanical *n pole_pairs
pole pair : 2
U
V
W
0
0
60
30
120
60
180
90
240
120
300
150
0
180
60
210
120
240
180
270
angle electrical
angle mechanical
Table 8. Programming Options for the Commutation Signals U/V/W
uvw (11:9)
Function
0
0
0
0
1
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
1
BLDC Pole Pairs : 1 ? electrical angle of 60o = mechanical angle: 60o
BLDC Pole Pairs : 2 ? electrical angle of 60o = mechanical angle: 30o
BLDC Pole Pairs : 3 ? electrical angle of 60o = mechanical angle: 20o
BLDC Pole Pairs : 4 ? electrical angle of 60o = mechanical angle: 15o
BLDC Pole Pairs : 5 ? electrical angle of 60o = mechanical angle: 12o
BLDC Pole Pairs : 6 ? electrical angle of 60o = mechanical angle: 10o
off ? LO pad U, V, W, PWM
7.10 Daisy Chain Mode
The angle information from the device and the setup for the device is handled over the digital interface. A special port (Dx) can be used to
implement a daisy chain mode. Depending on the configuration, it is possible to implement a two wire or a three wire mode. In the three wire
mode, each communication starts with the rising edge of the chip select signal. The Port Dx is used to transfer the chip select information from
one device to the next. Refer to Figure 14 and Figure 15 . In the two wire interface mode, a timeout logic ensures that the digital interface will be
reset if there is no clock source available for a certain time. The synchronization between the internal free running analog clock oscillator and the
external used digital clock source for the digital interface is done in a way that the digital clock frequency can vary in a wide range.
Remark: Reset for the digital interface:
3 wire mode ? via chip select
2 wire mode ? via timeout
Port
Chip Select
DCLK
Symbol
CS
DCLK
Function
Indicates the start of a new access cycle to the device
CS = LO ? reset of the digital interface.
Clock source for the communication over the digital interface. The maximum and
minimum frequency depends on the mode.
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