AS5040 AB austriamicrosystems, AS5040 AB Datasheet - Page 12

• Manufacturer Part Number: AS5040 AB
• Description: BOARD ADAPTER AS5040
• Manufacturer: austriamicrosystems

Specifications of AS5040 AB

• Sensor Type: Magnetic, Rotary Position
• Sensing Range: 360°
• Interface: Serial
• Voltage - Supply: 9V
• Embedded: No
• Utilized Ic / Part: AS5040
• Lead Free Status / RoHS Status: Lead free by exemption / RoHS compliant by exemption
• Sensitivity: -

AS5040 10-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER
Adapter PCB Operation Manual
The incremental outputs A,B, Index can be used in the same way as the incremental outputs of an optical
encoder. The maximum output current is 4mA for 5V output voltage and 2mA for 3.3V output voltage.
Per default, the AS5040 provides 256 pulses per revolution. Optionally, further resolutions can be programmed by
OTP (one-time-programming):
Operating Mode
0.0: Default
1.0 Quad 10bit
1.2 Quad 9 bit
1.4 Quad 8 bit
1.6 Quad 7 bit
2.0: LSB/Dir 10bit
2.2: LSB/Dir 9bit
2.4: LSB/Dir 8bit
2.6: LSB/Dir 7bit
Furthermore, the Index Pulse width can be programmed to 1LSB or 3LSB in the OTP register.
10.2 Generating the incremental pulses
Internally, the AS5040 always calculates absolute values. The incremental outputs are decoded from the absolute
values as shown below:
Absolute
value
Signal A:
Quad
Signal B:
Quad
Signal A: LSB
Four absolute values are required to generate one incremental pulse (see grey area in Table 3) and two absolute
values are required to generate a single channel (LSB) pulse.
Consequently, the maximum number of incremental pulses in 10bit-mode is 1024 / 4 = 256
and the maximum number of single channel (LSB) pulses is 1024 / 2 = 515
Revision A.03 04. Jul.06
0
1
2
3
OTP Mode Register bit
Md1
0
0
0
0
0
1
1
1
1
Table 2: Incremental Programming mode options
4
Table 3: Incremental signal generation
Md0
0
1
1
1
1
0
0
0
0
5
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6
Div1
0
0
0
1
1
0
0
1
1
7
8
Div0
0
0
1
0
1
0
1
0
1
9
10
Output A
256ppr
128ppr
64ppr
32ppr
512ppr
256ppr
128ppr
64ppr
11
12
13
Output B
256 ppr
128ppr
64ppr
32ppr
direction cw/ccw
direction cw/ccw
direction cw/ccw
direction cw/ccw
14
15
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