FS310 datasheet(27/40 Pages) TTELEC

27 / 40 page

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 27

FlexSense® I-Series Programmable

Incremental Encoder

FS210/FS310 Datasheet

Table 23. ILED field description

Bits

Description

ILK

Binary-weighted LEDK drive current (actual if C_OZ = 0, maximum if C_OZ = ‘b1); 0.6mA/LSB

nominally

C_OZ

Open/Closed loop current control bit:

Open-loop; current determined exclusively by ILK

Closed-loop; current set to make quad-track analog voltage conform to settings of LEDLP

LED Closed-Loop Control Register (LEDLP: [0x0887])

Table 24. LEDLP register definition

MSB

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

LSB

FAST (‘b0)

FB_SEL

LO_SEL

HI_SEL

Table 25. LEDLP field description

Bits

Description

HI_SEL

Sets quadrature-track differential analog voltage amplitude; level ≈ 500mV + 100mV/LSB

LO_SEL

Should be left at power-up default 00

FB_SEL

Closed-loop control is optimized when encoded level matches factory-trimmed VO:Q level; should be

set to 10

00: 1.15V

01: 1.20V

10: 1.25V

11: 1.30V

FAST

Open/Closed loop current control bit, always set to ‘b0:

Normal update rate; drive current updated approximately once per 16 seconds

LED Drive Current Readout Register (LEDLV: [0x088F])

Table 26. LEDLV register definition

MSB

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

LSB

C_OZR

ILKR

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