Data Sheet AR18 and AR35 Series Miniature Programmable Single-Turn Absolute Encoder with Resolution Ranging from 17 bits to 21 Bits Description Features The Broadcom AR18 and AR35 Series are the miniature Miniature absolute encoder ASIC surface mount DFN package: 10.9 mm (L) x 9.1 mm (W) x 1.5 mm (H) Absolute Encoder ASIC designed to cater for the growing demand on the space constraint application. User-programmable resolution ranging from: 17, 19, and 21 bit single turn (OD18). The AR18 encoder is designed for an overall diameter of 17 and 21 bit single turn (OD35). 18 mm and offers user-programmable resolution ranging User-programmable incremental output (ABI) resolution from 17, 19, and 21 bit single-turn absolute output. The ranging from 128 to 8192 CPR AR35 encoder is designed for an overall diameter of 35 mm User-programmable commutation signal (UVW) and offers 17 and 21 bits single-turn absolute output. ranging from 2, 3, 4, 5, 12, 30, 32 pole pair Differential output for ABI and UVW Both the AR18 and AR35 series provide the incremental ABI High temperature range of 40C to 115C suitable for and UVW in differential mode. Both come with a most of the industrial operation. recommended high temperature range of 40C to 115C Dual-mode operating voltage of 3.3V and 5V, enabling suitable for most industrial applications. Dual-mode handheld and portable device applications. operating voltage of 3.3V and 5V enable handheld and Selectable SSI mode communication protocol. portable device applications. Selectable RS485 mode communication protocol. Employing Broadcom patented Reflective Optical Encoding RoHs compliance. Theory, the AR18 and AR35 series offer a high accuracy with correction, which is unattainable by the magnetic Applications encoder. Robotic automation and engineering Factory automation and drone Medical and dentistry, devices and equipment High-accuracy portable and handheld devices Miniature motor, servo motor, linear actuator Broadcom AR18-AR35-Series-DS100 October 3, 2017Miniature Programmable Single-Turn Absolute Encoder with Resolution Ranging from 17 AR18 and AR35 Series Data Sheet bits to 21 Bits Functional Block Diagram With SSI 3-Wire Communication Protocol Selection Figure 1: SSI 3-Wire Block Diagram Vcc GND EEPROM * (Ext EEPROM I2C interface) EXT EEPROM 3.3V/5.0V A / Probe 1 B / Probe 2 ADC I / Probe 3 Digital Processing (SinP/SinN/ PDA Analog Front End CosP/CosN) U / Probe 4 V W SSI 3 Wire NSL SCLK DOUT LED Regulation SPI CLK SPI DIN MTP Interface SPI SPI DOUT Analog I/Os With ESL Communication Protocol Selection Figure 2: ESL Block Diagram Vcc GND EEPROM * (Ext EEPROM I2C interface) EXT EEPROM 3.3V/5.0V EXT OSC A / Probe 1 B / Probe 2 ADC I / Probe 3 Digital Processing (SinP/SinN/ Analog Front End PDA CosP/CosN) U / Probe 4 V W ESL RS485+ RS485- LED Regulation MTP Interface SPI Analog I/Os Broadcom AR18-AR35-Series-DS100 2 TST0 TST0 TST1 TST1 TST2 TST3 TST2 TST3