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.

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Rev C, 4/27/2023

Page 18

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FlexSense® I-Series Programmable

Incremental Encoder

FS210/FS310 Datasheet

Index-Track Outputs

The digital index-track outputs ZOUT_P and ZOUT_N are intended to produce one single pulse per code-wheel revolution,

provided the code wheel is designed properly for that purpose and the PXC/CCFG data pattern is consistent with the code

wheel. ZOUT_P is intended to be low for most of the code-wheel revolution and to have a single high-going pulse once per

revolution. ZOUT_N is the logical complement of ZOUT_P and therefore is intended to be high for most of the code-wheel

revolution and to have a single low-going pulse once per revolution, coincident with the single high-going pulse on ZOUT_P.

The Index-Track Configuration Register ZCFG controls whether the index-track output is differential – i.e. both ZOUT_P and

ZOUT_N to complementary logic levels – or single-ended – i.e. the FS210/FS310 places ZOUT_N in a high-impedance state

and only drives ZOUT_P. ZCFG also controls the timing of the single pulse on ZOUT_P/ZOUT_N with respect to the

quadrature-track outputs.

Index Track Gating

The ZOUT signals can optionally be gated by the quadrature outputs as detailed in the section below. All the gating

features are defined with Z+ - Z- tracks are greater than 0 and X+ - X- is less than 0, where X is either A or B as chosen in the

ZCFG register. If the opposite polarity of the quadrature signal is desired, i.e. X+ - X- is greater than 0, please contact the

factory.