ASA 25
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Data Sheet ASA 25 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 ASA 25 www.pwb-encoders.com precision works better Description The ASA 25 is a high-resolution, multi-functional encoder. It offers a variety of common encoder interfaces. The ASA 25 generates simultaneously position data as well as speed data. Thus, the encoder is ideal for positioning and rotation speed control. The ASA 25 is based on an off-axis 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 ASA 25 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 ASA 25 www.pwb-encoders.com precision works better Interface Data transfer: SSI Optionally the protocol is available with error bit. Further variations on request. The resolution is eligible between 13Bit, 18Bit and 19Bit. The position data increases when the shaft rotates in the direction of clockwise. Data transfer: BiSS (C-Mode) 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 detailed description of the protocol, see separate interface specification. The...

Data Sheet ASA 25 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. Optionally the protocol is available with low idle level on SCLK. Further variations are on request. The zero position can be set free at every arbitrary position (Preset). This interface is specially for the direct connection to the micro-controller from...

Data Sheet ASA 25 www.pwb-encoders.com precision works better Interface Incremental t (Rotation direction clockwise) Figure: Incremental interface 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 resolution...

Data Sheet ASA 25 www.pwb-encoders.com precision works better Rotation direction clockwise 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. Connector Molex connector, grid 1.25mm, angled, SMD 53261-1271 PWB encoders GmbH RESTRICTED THIS DOCUMENT...

Data Sheet ASA 25 www.pwb-encoders.com precision works better Sin90° Rotation direction clockwise As result of the differential evaluation of the both complementary signals Sin+ and Sin- as well as Cos+ and Cosby using the recommended receiving circuit you will get a Sinus and a Cosinus signal with an amplitude of 1Vss. Typical operating circuit * PWB encoders GmbH Am Goldberg 2 D-99817 Eisenach Germany info@pwb-encoders.com / www.pwb-encoders.com

Data Sheet ASA 25 www.pwb-encoders.com precision works better Mechanical Notes Parameter Magnet wheel outer diameter Ø Motor shaft diameter Ø 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 ASA 25 Total weight Protection grade according to DIN 40500 Mechanical Dimension PWB encoders GmbH Am Goldberg 2 D-99817 Eisenach Germany info@pwb-encoders.com / www.pwb-encoders.com

Data Sheet ASA 25 www.pwb-encoders.com precision works better IMPORTANT NOTICE The guarantee will be voided by misuse, accident, modification, unsuitable physical or operating environment, operation in other than the specified operating environment, or failure caused by a product for which PWB encoders GmbH is not responsible. PWB encoders GmbH reserves the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services also datasheets at any time. PWB encoders GmbH Am Goldberg 2 D-99817 Eisenach Germany info@pwb-encoders.com /...

Data Sheet ASA 25 www.pwb-encoders.com precision works better Ordering information Ordering code: Encoder Option S: Standard E: Extended The incremental interface and the absolute interface are chosen freely in combination. signal description SSI, BiSS ABI UVW Sin/Cos MISO MOSI NCS SCLK cable color of wire blue red green yellow purple black white brown pink pink/grey grey blue/red * for shielded and twisted-pair cable Sin- is yellow PWB encoders GmbH Am Goldberg 2 D-99817 Eisenach Germany info@pwb-encoders.com / www.pwb-encoders.com