AS5140H-ASSU austriamicrosystems, AS5140H-ASSU Datasheet - Page 24

• 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
Alignment Mode
The alignment mode simplifies centering the magnet over the center of the chip to gain maximum accuracy. Alignment
mode can be enabled with the falling edge of CSn while Prog = logic high
(see Figure
16). The Data bits D9-D0 of the
SSI change to a 10-bit displacement amplitude output. A high value indicates large X or Y displacement, but also
higher absolute magnetic field strength. The magnet is properly aligned, when the difference between highest and
lowest value over one full turn is at a minimum. Under normal conditions, a properly aligned magnet will result in a
reading of less than 128 over a full turn. The MagINCn and MagDECn indicators will be = 1 when the alignment mode
reading is < 128. At the same time, both hardware pins MagINCn (#1) and MagDECn (#2) will be pulled to VSS. A
properly aligned magnet will therefore produce a MagINCn = MagDECn = 1 signal throughout a full 360º turn of the
magnet. Stronger magnets or short gaps between magnet and IC may show values larger than 128. These magnets
are still properly aligned as long as the difference between highest and lowest value over one full turn is at a minimum.
The Alignment mode can be reset to normal operation by a power-on-reset (disconnect / re-connect power supply) or
by a falling edge on CSn with Prog = low.
Figure 15. Enabling the Alignment Mode
Prog
Read-out
AlignMode enable
via SSI
CSn
2µs
2µs
min.
min.
Figure 16. Exiting Alignment Mode
Prog
Read-out
exit AlignMode
via SSI
CSn
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