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AS5045
Data Sheet
8 Mode Input Pin
The mode input pin activates or deactivates an internal filter that is used to reduce the analog output noise.
Activating the filter (Mode pin = LOW) provides a reduced output noise of 0.03° rms. At the same time, the output
delay is increased to 384μs. This mode is recommended for high precision, low speed applications.
Deactivating the filter (Mode pin = HIGH) reduces the output delay to 96μs and provides an output noise of 0.06°
rms. This mode is recommended for higher speed applications.
The MODE pin should be set at power-up. A change of the mode during operation is not allowed.
Switching the Mode pin affects the following parameters:
Table 2. Slow and Fast Mode Parameters 12-bit Absolute Angular Position Output
Parameter
Sampling rate
Transition noise (1 sigma)
Output delay
Max. speed @ 4096 samples/rev.
Max. speed @ 1024 samples/rev.
Max. speed @ 256 samples/rev.
Max. speed @ 64 samples/rev.
Slow Mode (Mode = low)
2.61 kHz (384 μs)
≤ 0.03° rms
384μs
38 rpm
153 rpm
610 rpm
2441 rpm
Fast Mode (Mode = high, VDD5V)
10.42 kHz (96μs)
≤ 0.06° rms
96μs
153 rpm
610 rpm
2441 rpm
9766 rpm
8.1 Synchronous Serial Interface (SSI)
Figure 5. Synchronous Serial Interface with Absolute Angular Position Data
CSn
t CLK FE
t CLK FE
T CLK/2
t CSn
CLK
1
8
18
1
DO
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
OCF
COF
LIN
Mag
INC
Mag
DEC
Even
PAR
D11
t DO active
t DO valid
Angular Position Data
Status Bits
t DO Tristate
If CSn changes to logic low, Data Out (DO) will change from high impedance (tri-state) to logic high and the read-out
will be initiated.
After a minimum time t CLK FE, data is latched into the output shift register with the first falling edge of CLK.
Each subsequent rising CLK edge shifts out one bit of data.
The serial word contains 18 bits, the first 12 bits are the angular information D[11:0], the subsequent 6 bits
contain system information, about the validity of data such as OCF, COF, LIN, Parity and Magnetic Field status
(increase/decrease).
A subsequent measurement is initiated by a “high” pulse at CSn with a minimum duration of t CSn.
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