AS25/AS50
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Data Sheet AS25/AS50 www.pwb-encoders.com precision works better Absolute / Incremental Singleturn Encoder 18 Bit PWB encoders GmbH Am Goldberg 2 D-99817 Eisenach Germany Phone: +49 3691 72580-0 Fax: +49 3691 72580-29 info@pwb-encoders.com www.pwb-encoders.com PWB encoders GmbH Am Goldberg 2 D-99817 Eisenach Germany info@pwb-encoders.com / www.pwb-encoders.com

Data Sheet AS25/AS50 www.pwb-encoders.com precision works better Description The AS 25/50 is a high-resolution, multi-functional encoder. It offers a variety of common encoder interfaces. The AS 25/50 generates simultaneously position data as well as speed data. Thus, the encoder is ideal for positioning and rotation speed control. The AS 25/50 is based on radial Hall sensing of a two track magnetic wheel by using the nonius principle. The differential sensing offers the advantage of effectively suppressing homogenous magnetic interferences. This is the reason why static fields don’t have a...

Data Sheet AS25/AS50 www.pwb-encoders.com precision works better Recommended operating conditions Electrical characteristics are only effective for the range of the operating temperatures. Typical values at 25 °C. Parameter Supply voltage Supply current Reverse polarity protection SSI / BiSS / SPI Clock frequency Scan ratio of T Time lag Monoflop time Rise time Fall time High level output voltage Low level output voltage Output current per channel overload protection Output driver current Analog amplitude Analog offset Environment Operating temperature Storage temperature Sin/Cos with diff....

Data Sheet AS25/AS50 www.pwb-encoders.com precision works better Interface Data transfer: SSI The position data increases when the shaft rotates in the direction of clockwise Optionally the protocol is available with error bit. Further variations on request. The resolution is eligible between 13Bit and 18Bit. Data transfer: BiSS (C-Mode) The position data increases when the shaft rotates in the direction of clockwise Serial interface protocol Acknowledge-Bit Start-Bit Control-Bit Position-Data Low activ error Low activ warning Cyclic redundancy code Stop-Bit Control data master For a...

Data Sheet AS25/AS50 www.pwb-encoders.com precision works better Interface Data transfer: SPI Figure: SPI transmission, using opcode READ REGISTER as an example Figure: SPI transmission, READ SENSOR DATA The Data is sent in packages of 8 bits and with the MSB first. Each data transmission starts with the master sending an opcode to the slave. The standard resolution is 18Bit. Optionally the protocol is available with low idle level on SCLK. Further variations are on request. The direction of rotation can be inverted. The zero position can be set free at every arbitrary position (Preset)....

Data Sheet AS25/AS50 www.pwb-encoders.com precision works better Interface Incremental Amplitude Figure: Incremental interface with differential signals Optionally the Index pulse I (Po) is available in four different lengths (90°e, 180°e, 270°e and 360°e). The position of the index pulse is in relation to the A/B signals. The direction of rotation can be inverted. The position of the Index can be set free (Preset). Further variations are on request. The resolution of incremental signals ABI can be programmed for each singleturn cycle within a range of 4 to 262,144 edges. That means a...

Data Sheet AS25/AS50 www.pwb-encoders.com precision works better Figure: commutation sequence with 6 pole pairs. The phaseshift between the commutation signals is 120°e. The number of pole pairs for the commutation signals for BLDC motors are available from 1 up to 16. (1, 2, 3, …, 14, 15, 16 pole pairs) Optionally the direction of rotation can be inverted. The start angle for the offset of the winding of the BLDC and the Hall sensor signals can be set free. PWB encoders GmbH Am Goldberg 2 D-99817 Eisenach Germany info@pwb-encoders.com / www.pwb-encoders.com

Data Sheet AS25/AS50 www.pwb-encoders.com precision works better Interface Analog Figure: analog signals The number of sinus / cosines signals per revolution are depended on the magnet outer diameter: - AS 25: 32 Sin/Cos - AS 50: 64 Sin/Cos As result of the differential evaluation of the both complementary signals Sin+ and Sin- as well as Cos+ and Cos- by using the recommended receiving circuit (see page 9) you will get a Sinus and a Cosinus signal with an amplitude of 1Vss. PWB encoders GmbH Am Goldberg 2 D-99817 Eisenach Germany info@pwb-encoders.com / www.pwb-encoders.com

Data Sheet AS25/AS50 www.pwb-encoders.com precision works better Typical operating circuit * * for SSI, BiSS, ABI, UVW and Sin/Cos** ** for Sin/Cos: RT = ∞ Rotation direction Rotation direction clockwise (count up) PWB encoders GmbH RESTRICTED THIS DOCUMENT AND ANY ASSOCIATED DATA CONTAINS RESTRICTED INFORMATION THAT IS PROPERTY OF PWB encoders GmbH AND MAY NOT BE DISCLOSED OR DUPLICATED FOR OTHERS EXCEPT AS AUTHORIZED BY PWB encoders GmbH INFORMATION CONTAINED IN THIS PUBLICATION MAY BE SUPERSEDED BY UPDATES. IT IS YOUR RESPONSIBILITY TO ENSURE THAT YOUR APPLICATION MEETS WITH YOUR...

Data Sheet AS25/AS50 www.pwb-encoders.com precision works better Mechanical Notes Parameter Magnet wheel outer diameter Ø Shaft diameter Øw Permissible radial displacement Permissible tangential displacement Permissible axial displacement Permissible excentricity Sensor to magnet wheel distance Moment of inertia of the magnet wheel Mounting screw size Tightening torque of the screws Permissible rotational speed AS 25 Permissible rotational speed AS 50 Total weight Protection grade according to DIN 40500 Customer specific magnet wheels are accomplishable on request. Mechanical Positioning...

Data Sheet AS25/AS50 www.pwb-encoders.com precision works better Mechanical Dimension Encoder Head The Encoder head and the accompanying magnet wheel constitute an unit which belongs together. Every Encoder Head is initialised for his own accompanying magnet wheel. He is matched with the magnet wheel and programmed by his first operation by PWB encoders GmbH. Don’t mix up this combination with other ones. If you exchange the magnet wheel, it may be in function, but the values at the datasheet couldn’t guarantee. Exchange between different magnet wheel sizes are not possible. PWB encoders...