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, 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.