PMODENC_RM [ETC]

PmodENCâ¢ Reference Manuall; PmodENCâ ?? ¢参考手册册


型号：	PMODENC_RM
厂家：	ETC
描述：	PmodENCâ¢ Reference Manuall PmodENCâ ?? ¢参考手册册
文件：	总2页 (文件大小：127K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

PmodENC™ Reference Manual

Revision: October 31, 2011

1300 NE Henley Court, Suite 3

Pullman, WA 99163

(509) 334 6306 Voice | (509) 334 6300 Fax

Note: This document applies to REV A of the board.

Overview

The PmodENC Rotary Encoder Module

features a rotary shaft encoder with integral

push-button that provides rotate-right, rotate-

left, and button-press outputs. The module also

includes a sliding switch that provides an on/off

output.

Features include:

1 = A

2 = B

3 = BTN

4 = SWT

5 = GND

6 = VCC

•

a rotary push-button shaft encoder

a slide switch with a series resistor

a 6-pin header

small form factor (1.5” x 0.75”).

Figure 1 PmodENC Pin Signals

Functional Description

There are four outputs on the PmodENC

module, labeled A, B, BTN, and SWT. Outputs

A and B are the encoded outputs from the

rotary shaft encoder. In principle, the rotary

shaft encoder behaves like a cam connected to

a central shaft. Rotating the shaft operates two

push-button switches, as shown in Figure 2.

Depending on which way the shaft is rotated,

one of the switches closes before the other.

Likewise, as the rotation continues, one switch

opens before the other. When the shaft is

stationary (the detent position) both switches

are open (logic 1).

Figure 2 Rotary Shaft Encoder Circuitry

Doc: 502-117

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PmodXYZ Reference Manual

Pressing the rotary push-button shaft encoder

will drive the output pin BTN to VCC voltage or

a logic level 1. Otherwise BTN is driven to

GND voltage or a logic level 0.

Placing the slide switch into the up position on

the PmodENC module will drive the output

SWT to VCC voltage or a logic level 1. Placing

the slide switch in the down position will drive

SWT to GND voltage or a logic level 0.

Figure 3 Push-Button Circuitry

Decoding Rotations of the Rotary

Shaft

Figure 4 shows a timing diagram of a rotate-

right on the rotary push-button shaft of the

PmodENC module. Note the logic noise shown

with opening and closing of the switches. A

rotate-left of the rotary push-button shaft is

similar to Figure 4. The only difference is that

output B will drop to logic level 0 first, followed

by output A.

Figure 4 Timing of Outputs A and B

www.digilentinc.com

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ETC