AS5140H-ASSU austriamicrosystems, AS5140H-ASSU Datasheet - Page 12

• Manufacturer Part Number: AS5140H-ASSU
• Description: ENCODER, MAGNETIC, ROTARY, 10BIT, 16SSOP
• Manufacturer: austriamicrosystems

Specifications of AS5140H-ASSU

• Brief Features: User Programmable Zero / Index Position, Failure Detection Mode
• Supply Voltage Range: 3V To 3.6V, 4.5V To 5.5V
• Operating Temperature Range: -40°C To +150°C
• Digital Ic Case: RoHS Compliant
• Ic Function: 10-bit Programmable Magnetic Rotary Encoder
• Rohs Compliant: Yes

AS5140H
Data Sheet - D e t a i l e d D e s c r i p t i o n
7 Detailed Description
The AS5140H is manufactured in a CMOS standard process and uses a spinning current Hall technology for sensing
the magnetic field distribution across the surface of the chip. The integrated Hall elements are placed around the
center of the device, and deliver a voltage representation of the magnetic field at the surface of the IC. Through Sigma-
Delta Analog / Digital Conversion and Digital Signal-Processing (DSP) algorithms, the AS5140H provides accurate
high-resolution absolute angular position information. For this purpose, a Coordinate Rotation Digital Computer
(CORDIC) calculates the angle and the magnitude of the Hall array signals. The DSP is also used to provide digital
information at the outputs MagINCn and MagDECn that indicate movements of the used magnet towards or away from
the device’s surface. A small low cost diametrically magnetized (two-pole) standard magnet provides the angular
position information
(see Figure
18).
The AS5140H senses the orientation of the magnetic field and calculates a 10-bit binary code. This code can be
accessed via a Synchronous Serial Interface (SSI). In addition, an absolute angular representation is given by a Pulse
Width Modulated signal at pin 12 (PWM). Simultaneously, the device also provides incremental output signals. The
various incremental output modes can be selected by programming the OTP mode register bits
(see Table
10). As long
as no programming voltage is applied to pin Prog, the new setting may be overwritten at any time and will be reset to
default when power is turned off. To make the setting permanent, the OTP register must be programmed. The default
setting is a quadrature A/B mode including the Index signal with a pulse width of 1 LSB. The Index signal is logic high
at the user programmable zero position.
The AS5140H is tolerant to magnet misalignment and magnetic stray fields due to differential measurement technique
and Hall sensor conditioning circuitry.
Figure 4. Typical Arrangement of AS5140H and Magnet
10-bit Absolute Angular Position Output
Synchronous Serial Interface (SSI)
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.
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