USB100N24 데이터 시트보기 (PDF) - Fairchild Semiconductor

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USB100N24

Programmable Low-Cost USB Machine (PLUM)

Fairchild Semiconductor 

and a roller wheel to detect mouse movement. In contrast, joystick

uses a potentiometer to detect angular motion. The function select

bits [F1:0] allow the designer

to set the bits. In a mouse mode, the H1, H2, V1,V2 and H3 & H4

inputs are selected for the roller mechanism decode.In the joystick

mode, it selects the potentiometer interface. The state machine

uses a different algorithm for interpreting the inputs to the chip.

This function selection also affects the format of the report that is

generated.The roller mode is shown in schematic 1 and the

potentiometer mode is shown in schematic 2.

In case of the roller mode of operation (mouse/trackball), the

transitions on the Hx and Vx pairs are used in the counting process

to generate a digital estimate of the motion of the ball. In the

joystick mode of operation, the RC timing constant changes the

width of an internal digital pulse whose width is measured and

reported back. All of the buttons feature an internal pullup. The

actual switches used is a push button switch with one terminal

connected to a button input and the second terminal connected to

ground.

Crystal / Crystal Oscillator combination

OSC1

Suspend mode operation

When the PLUM device determines that the necessary conditions

(laid down in the USB standard), it goes into the suspend mode.

It wakes up on USB bus activity, or when any of the buttons are

depressed. There exists an internal timer, whose timing operation

could be selected via bits 3 through 0 in ICB register 5. The PLUM

device wakes up on the expiration of the timer. It senses the roller/

potentiometer interface to determine if these inputs have changed

since the last poll. It does a remote wakeup, when such a

movement has occurred.

Remote Wakeup Support

This device supports the remote wakeup feature. This is indicated

to the host via the corresponding descriptor. Internally, the state

machine uses the values of the RRES_EN and RRES[2:0] bits in

the Remote Resume configuration byte to enable this feature, and

the amount of time between the “polls” to the roller/potentiometer

ports to determine whether the necessary conditions for wakeup

have been met.

OSC2

The above configuration is the recommended configuration for

use with a crystal or a ceramic resonator. The capacitors are

optional and if used, must be in the 10-30pf range. The resistor is

necessary and its value is 1MΩ. A metal-can oscillator may be

used too. In this case, the output of the oscillator must be

connected to OSC1 and OSC2 must be left unconnected.

Life Support Policy

Fairchild's products are not authorized for use as critical components in life support devices or systems without the express written

approval of the President of Fairchild Semiconductor Corporation. As used herein:

1. Life support devices or systems are devices or systems which,

(a) are intended for surgical implant into the body, or (b) support

or sustain life, and whose failure to perform, when properly

used in accordance with instructions for use provided in the

labeling, can be reasonably expected to result in a significant

injury to the user.

2. A critical component is any component of a life support device

or system whose failure to perform can be reasonably ex-

pected to cause the failure of the life support device or system,

or to affect its safety or effectiveness.

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Tel: 81-3-3818-8840

Fax: 81-3-3818-8841

Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications.

USB100 rev.D

8

www.fairchildsemi.com

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