AS5311-ASSU austriamicrosystems, AS5311-ASSU Datasheet - Page 15

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

Specifications of AS5311-ASSU

• 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
8 Pulse Width Modulation (PWM) Output
The AS5311 provides a pulse width modulated output (PWM), whose duty cycle is proportional to the relative
linear position of the magnet within one pole pair (2.0mm). This cycle repeats after every subsequent pole pair:
The PWM frequency is internally trimmed to an accuracy of
tolerance can be cancelled by measuring the complete duty cycle as shown above.
Figure 10. PWM Output Signal
9 3.3V / 5V Operation
The AS5311 operates either at 3.3V ±10% or at 5V ±10%. This is made possible by an internal 3.3V Low-
Dropout (LDO) Voltage regulator. The internal supply voltage is always taken from the output of the LDO,
meaning that the internal blocks are always operating at 3.3V.
For 3.3V operation, the LDO must be bypassed by connecting VDD3V3 with VDD5V (see Figure 11).
For 5V operation, the 5V supply is connected to pin VDD5V, while VDD3V3 (LDO output) must be buffered by a
2.2...10µF capacitor, which is supposed to be placed close to the supply pin.
The VDD3V3 output is intended for internal use only It must not be loaded with an external load.
The output voltage of the digital interface I/O’s corresponds to the voltage at pin VDD5V, as the I/O buffers are
supplied from this pin.
A buffer capacitor of 100nF is recommended in both cases close to pin VDD5V. Note that pin VDD3V3 must
always be buffered by a capacitor. It must not be left floating, as this may cause an instable internal 3.3V supply
voltage which may lead to larger than normal jitter of the measured angle.
www.austriamicrosystems.com
for digital position = 0 – 4094
Exception:
Position
t
t
on
on
4098
A linear position of 1999.5µm = digital position 4095
will generate a pulse width of t
t
off
1
1µs
Revision 1.04
on
= 4097µs and a pause t
5% ( 10% over full temperature range). This
4097µs
4098µs
off
= 1µs
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