AS5311-ASST austriamicrosystems, AS5311-ASST Datasheet - Page 16

• Manufacturer Part Number: AS5311-ASST
• Description: IC ENCODER LINEAR 20-TSSOP
• Manufacturer: austriamicrosystems
• Type: Linear, Rotary Encoder - Programmabler

Specifications of AS5311-ASST

• Voltage - Supply: 3 V ~ 3.6 V, 4.5 V ~ 5.5 V
• Current - Supply: 21mA
• Current - Output (max): 4mA
• Output Type: Digital, PWM, 12-Bit Serial
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 20-TSSOP (0.173", 4.40mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Sensing Range: -
• Features: -

AS5311
Data Sheet
Figure 11. Connections for 5V and 3.3V Supply Voltages
10 Magnet Specifications
10.1 Magnetization
The AS5311 accepts magnetic multi-pole strip or ring magnets with a pole length of 1.0mm. Recommended
magnet materials include plastic or rubber bonded ferrite or Neodymium magnets.
It is not recommended to use the AS5311 with other pole lengths as this will create additional nonlinearities.
Figure 12. Additional Error from Pole Length Mismatch
Figure 12 shows the error caused by a mismatch of pole length. Note that this error is an additional error on top
of the chip-internal INL and DNL errors (see 6.5). For example, when using a multi-pole magnet with 1.2mm pole
length instead of 1.0mm, the AS5311 will provide 1024 incremental steps or 4096 absolute positions over
2.4mm, but with an additional linearity error of up to 50µm.
The curvature of ring magnets may cause linearity errors as well due to the fact that the Hall array on the chip is
a straight line while the poles on the multi-pole ring are curved. These errors decrease with increasing ring
diameter. It is therefore recommended to keep the ring diameter measured at the location of the Hall array at
20mm or higher.
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Error
[µm]
70.00
60.00
50.00
40.00
30.00
20.00
10.00
0.00
750 800 850 900 950 1000 1050 1100 1150 1200 1250
AS5311 Systematic Linearity Error Caused by Pole
Length Deviation
Pole Length [µm]
Revision 1.04
Error [µm]
16 - 24