General Note

TT Electronics reserves the right to make changes in product specification without

notice or liability. All information is subject to TT Electronics’ own data and is

considered accurate at time of going to print.

TT Electronics | OPTEK Technology

2900 E. Plano Parkway, St 200, Plano, TX 75074, USA | Ph: +1 972 323 2200

www.ttelectronics.com | sensors@ttelectronics.com

Rev C, 4/27/2023

Page 2

© TT electronics plc

FlexSense® I-Series Programmable

Incremental Encoder

FS210/FS310 Datasheet

General Description

The FS210/FS310 is a user-configurable single-chip solution for an incremental optical encoder, available in a surface-mount

high-usage-temperature-tolerant package. The sensor is available for both transmissive (FS210) and reflective (FS310)

applications. Its programmable photosensor pattern can accommodate code wheels with printing densities of up to 635

lines per inch for the FS310, which corresponds to more than 2,048 pulses per revolution (PPR) at an optical radius of 13mm

(320 LPI for the FS210). It provides complementary quadrature– and index-track outputs. Its quadrature outputs are

configurable as either analog (with ≤ 1% THD, enabling high-quality off-chip interpolation) or digital (with low quadrature

error) with up to 8x interpolation or programmable down-division by up to 2,048x in order to handle a wider logical PPR

range. Its digital index-track output can be configured to be synchronized to either quadrature output, for a pulse width of

exactly one-half cycle, or to both quadrature outputs, for a pulse width of exactly one-quarter cycle. The FS310 includes an

in-package LED, and both the FS210/FS310 include an integrated driver that is user-configurable either to drive a fixed user-

configurable current or as part of a closed-loop control system to produce a fixed optical input power density over its

photosensors. The easy-to-use I2C interface and memory-mapped photosensor configuration enable automated alignment

and signal conditioning during encoder module assembly, all from a single 3.3V ±10% supply.

Package Pinout

Pixel Array

TOP VIEW

FS210

5x5mm OQFN 32-Pin

EP (GND)

17

18

19

20

21

22

23

24

GND

16

VSS

14

VDD

15

NC

13

IRQZ

12

SCL

11

SDA

10

9

MODE

25

NC

NC

26

VSSA

27

AOUT_P_ANA

28

AOUT_N_ANA

29

BOUT_P_ANA

30

BOUT_N_ANA

31

VDDA

32

8

7

4

3

2

1

5

6

Figure 1: FS210 Pin Configuration (5mm x 5mm OQFN -

top view)

Pixel Array

TOP VIEW

FS310

5x5mm OQFN 32-Pin

EP (GND)

17

18

19

20

21

22

23

24

GND

16

VSS

14

VDD

15

NC

13

IRQZ

12

SCL

11

SDA

10

9

MODE

25

NC

NC

26

VSSA

27

AOUT_P_ANA

28

AOUT_N_ANA

29

BOUT_P_ANA

30

BOUT_N_ANA

31

VDDA

32

8

7

5

4

3

2

1

6

Figure 2: FS310 Pin Configuration (5mm x 5mm OQFN -

top view)