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Broadcom AS38-H39x Series 39-bit absolute encoder family

The AS38-H39E-Sxxx is a multi-turn absolute encoder series with 39-bit resolution (23-bit single-turn and 16-bit multi-turn) consisting of a patterned disk

The AS38-H39E-Sxxx is a multi-turn absolute encoder series with 39-bit resolution (23-bit single-turn and 16-bit multi-turn) consisting of a patterned disk, a light source, and photosensitive elements that translate mechanical motion to electrical signal. The -Sxxx series come with preloaded SSI communication protocol supported by a full duplex line transmission drive (RS-485), offering good noise immunity to enable a robust data transmission up to 1 Mbps in harsh industrial environments.

Key features

39-bit resolution
Alarm features with CRC and alarm status bits
uilt in with SSI mode communication protocol
Supports 8mm diameter of blind hollow shaft

Additional features

39-bit resolution: 16-bit energy harvesting multi-turn & 23-bits optical single-turn
Alarm features with CRC and alarm status bits
Built in with SSI mode communication protocol
Overall encoder outer diameter of Ø38 mm and maximum height of 40 mm
Supports 8mm diameter of blind hollow shaft
5K bits of user accessible memory in E2PROM

Applications

Robotics
Factory Automation
Linear Positioning System
CNC Machine Tool
Medical and Lab Equipment
Wind Turbine

Key Advantage

The key advantage of the AS38-H39E-Sxxx is that the multi-turn tracking circuitry does not need a battery as its power is generated by the Wiegand-based energy harvesting technology. Also, the gearless multi-turn counting does not have gear wear-out or acoustics noise issue typically encountered in conventional gear based multi-turn encoders.

Comparing to other multi-turn encoders with battery backup, the AS38-H39E-Sxxx does not have down time associated with periodic maintenance of the battery backup components. Intended for industrial applications, the product incorporates an ESD protection circuitry meeting Class 3 ESD immunity per IEC -61000-4-2 standard and is also compliant with IP50 per IEC 60529 standard.