USB100_技术文档

PRELIMINARY

January 1999

USB100

Programmable Low-Cost USB Machine (PLUM)

Single Chip Controller for Mouse, Trackball, Joystick and Gamepad Applications

General Description

Features

The USB100 is a Low cost, fully customizable controller for USB

HID-class pointing devices. It is in full compliance with REV 1.0

of the USB standard and implements the HID class specification

for mice, trackballs, joysticks and gamepads. This device inter-

prets the commands specified in the HID class document and

provides appropriate responses from an On-Chip EEPROM. It

also provides ability to customize the device according to indi-

vidualneedsofthedesigners. Programmingutilitiessuppliedwith

this device allow HID manufacturers to easily create the neces-

sary data to be programmed into the device.

■ USB 1.0 standard compliant

■ Has the necessary on-chip transceivers

■ Support for 2D and 3D mice with 2, 3 or more buttons

■ Supports 3 potentiometer mechanisms for joysticks

■ Up to 16 buttons for digital gamepads

■ Choice of 18-pin and 24-pin packages

■ Choice of 2Kbit and 4Kbit EEPROM densities

The device includes the necessary transceiver for USB operation

and meets all of the active and standby current specifications for

a bus-powered device.

Block Diagram

POWER

USB

X

SERIAL

INTERFACE

ENGINE

TX-FIFO

RX-FIFO

COMMAND

PROCESSOR

(HID)

C

V

R

USB CABLE

(D+, D-,

POWER &

GROUND)

STATE MACHINE

UP TO 3 ROLLER/

EEPROM

POTENTIOMETER

MECHANISMS

UP TO 16 BUTTONS

Use "A Diagram Number" Style Sheet"

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USB100 rev.D

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Pinout

24 Pin Package

18 Pin 3D Package

OSC2

OSC1

VDD

USBD+

USBD-

GND

B1

OSC1

OSC2

H4

B8/F

RESET

H3

VDD

B6

USBD+

USBD-

GND

B7

H4

F

RESET

H3

H1

H2

B2

H1

B5

V1

B3

H2

B1

V2

O1

V1

B2

V2

B3

O2

B4

GND

O1

Pin Description

H4

Type

Description

Roller/Button/Joystick input.

Register output pin / Button input.

Crystal input number 1.

Crystal input number 2

Button input

I

H3

I

O2

I/O

OSC1

OSC2

B4

I

Reset

H1

I

Active high reset pin

Roller/Button/Joystick input.

Ground

I

H2

I

V1

I

V2

I

GND

B7

I

Button input

B6

Button input

B5

I

Button input

VDD

USBD+

USBD-

GND

B8/F

B1/CS

I

Positive power supply

USB D + line

O

I

USB D – line

Ground

I/O

I

Button input / LED driver

Button input and chip select to internal

EEPROM.*

B2/SK

B3/DI

I

Button input and system clock to internal

EEPROM.*

Button input and data in to internal

EEPROM.*

O1/DO

O

Button input and data out to read from

internal EEPROM.*

* See Programming internal EEPROM section

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USB100 rev.D

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Absolute Maximum Ratings

Ambient Storage Temperatures

Operating Conditions

Ambient Operating Temperature

Power Supply (V_CC) Range

-65°C to + 150°C

0°C to +70°C

All Input or Output Voltages with

respect to ground

V_CC+ 1 to – 0.3V

4.4V to 5.5V

Lead Temperature

+300%

2000V

(Soldering, 10 seconds)

ESD Rating

DC and AC Electrical Characteristics 4.4V ≤ V_CC≤ 5.5V

Symbol

I_CCA

I_CCS

V_IL

Parameter

Conditions

Min

Max

40

Units

mA

µA

V

Operating Current

USB interface in active mode

USB interface in suspend

Standby Current

500

0.8

Input Low Voltage

Input High Voltage

Output Low Voltage

Output High Voltage

Input Leakage Current

Output Leakage Current

SK Clock Frequency

SK High Time

V_IH

2

V

V_OL

0.4

V

V_OH

I_IL

2.4

V

2.5

1

µA

MHz

ns

I_OL

F_SK

Note 3

Note 4

0

T_SKH

T_SKL

T_CS

250

50

SK Low Time

ns

Minimum CS Low Time

CS Setup Time

ns

T_CSS

T_DH

ns

DO Hold Time

70

ns

T_DIS

T_CSH

T_DIH

T_PD1

T_PD0

T_SY

DI Setup Time

100

0

ns

CS Hold Time

ns

DI Hold Time

20

ns

Output Delay to “1”

Output Delay to “0”

CS to Status Valid

CS to DO in TRI-STATE

Write Cycle Time

500

100

10

ns

T_DF

ns

T_WP

ms

AC Test Conditions

Output Load

Timing Measurements Reference Level

1 TTL Gate

Input

1V and 2V

Input Pulse Levels

0.4V and 2.4V

Output

0.8V and 2.0V

Note 1: Stress ratings above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and operation of the

device at these or any other conditions above those indicated in the operational sections of the specification is not implied. Exposure to absolute maximum rating conditions for

extended periods may affect device reliability.

Note 2: The shortest allowable S clock period = 1/f_SK(as shown under the f_SKparameter). Maximum SK clock speed (minimum SK period) is determined by the interaction of

several AC parameters stated in the datasheet. Within this SK period, both t_SKHand t_SKLlimits must be observed. Therefore, it is not allowable to set 1/f_SK= t_SKH(minimum) +

t

_SKL(minimum) for shorter SK cycle time operation.

Note 3: CS (Chip Select) must be brought low (to V_IL) for an interval of t_CSin order to reset all internal device registers (device reset) prior to beginning another opcode cycle.

(This is shown in the opcode diagrams in the following pages.)

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USB100 rev.D

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O1, O2 Functionality. ICB register 1[3:2]

IOM[1:0] Function

Interface Pin Descriptions

H1, H2, H3, H4, V1, V2 (Roller/Joystick inputs)

When configured as roller inputs these pins function in pairs, H1

and H2, H3 and H4, V1 and V2 to allow photo diodes to be

attached in a mouse or trackball application. See the section

“Roller Movement Reporting” for a more detailed description.

When configured for a joystick only one of the inputs pairs is used.

A potentiometer is attached to track the movements of a joystick

lever. When these inputs are configured as buttons they all act

independently as active low button inputs. All of them have

internalpull-upsanddebouncecircuitrywhichcanbeprogrammed

using the ICB registers. These inputs also contain current sink

features so no external resistor is needed to sink current from the

photo diode.

00

01

11

Both O1 and O2 function as programmable

outputs.

O1 is a programmable output but O2 is a

standard button input.

Both O1 and O2 are standard inputs.

In case these are selected as outputs, their state (1 or 0) can be

set using the USB set_report command. These outputs are open-

collector.AtypicaluseoftheseoutputsisusingthemtodriveLEDs

(for example, a drag-lock function in a trackball). These pins have

a programmable current sink capability.

B1, B2, B3, B4, B5, B6, B7, B8/F (Button inputs)

B8/F

The button inputs to the USB100 have internal pull up resistors,

with active low inputs to the chip. These inputs also contain

debounce circuitry which can be programmed by the ICB regis-

ters.

When this pin is configured as an input it will behave as a standard

button input. But if the pin is disabled in the ICB registers then this

pin can be used to control the roller LEDS in powersave mode.

Using the B8/F pin to control the LEDs

Key Debounce Select Table (ICB register3[3:2])

KD[1:0]

VDD

00

01

10

11

15 ms

30 ms

45 ms

60 ms

USB100

F

USBD -, USBD +

This allows the LEDs to be shut off during powersave mode which

allows the USB100 to draw very little current. The official name for

powersave mode on a USB device is known as suspend mode

which is discussed in the section labeled Suspend Mode Opera-

tion.

These inputs are the serial bus lines which USB data is commu-

nicated. These bi – directional lines connect to the host, through

a USB type A or type B connector, and are used to communicate

all USB information to and from the host. The two lines must both

be wired through a 27 ohm resistor before being attached to the

USB connector. See Recommended Configuration for a detailed

diagram.

OSC1, OSC2

These two pins are the clock inputs into the USB100. The speed

atwhichthechiprunsatis6MHz. Theclocksigncanbegenerated

twoways.Thefirstistouseaparallelresonant,fundamentalmode

crystal circuit or a ceramic resonator circuit connected to the

OSC1 and OSC2 inputs. The other method is to use a crystal

oscillator connected to the OSC2 input and leaving the OSC1

input unconnected

Reset

This pin is used to reset the entire chip. It must be held high for

morethan10ns,toresetthechipandthenbroughtlowforthereset

of normal chip operation.

O1, O2

USB modes of operation

These two pins are wired to internal registers which can be

programmed with either a “1” or a “0” by a USB request. If this

command is sent to the USB100. INSERT COMMAND FROM

INSPECTOR. Then the O1 and O2 pins will be programmed with

the values that are in the second data package. These two pins

canalsobeconfiguredasstandardbuttoninputsbyoneoftheICB

registers.

The USB100 loads up its configuration from the EEPROM on

power-on reset, or when a USB reset command is issued. Upon

completion of reset, the device is in a operational mode, and

respondscorrectlytothevariouscommandsdescribedintheUSB

spec rev 1.0. The USB100 supports two endpoints – the default

endpoint (endpoint 0) and the interrupt endpoint (endpoint 1). The

supported packet size on both endpoints is 8 bytes. The endpoint

1 is an “IN” endpoint.

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USB100 rev.D

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Standard Requests

IS[3:0]

0000

0001

0010

0011

0100

0101

0110

0111

1000

1001

Current

0.1 mA

0.2 mA

0.3 mA

0.4 mA

0.5 mA

0.6 mA

0.7 mA

0.8 mA

0.9mA

The USB100 supports all of the required standard requests.

These requests are sent to the device using control transfers to

endpoint 0.

In USB terminology, the data transmitted by the mouse when

movement is detected is called a report. The reports are gener-

ated by the USB100 device in accordance to the USB HID spec

1.0 Final.

Programming the EEPROM

The on-chip EEPROM can be programmed in a special mode

which defines some of the button inputs/output as a microwire

port..Inthismode,theseinputsbehaveasaconventionalMicrowire

serial port. Data can be easily programmed and verified, by

executing simple EEPROM programming commands.

1.0mA

Initial Configuration Bytes (ICB) register

description

InputPinConfigurationByte0(ICB0)(Address1)

D7

D6 D5 D4

D3 D2 D1

D0

The first five bytes in the EEPROM are used to configure the

physical characteristics of the USB100 device, and are called the

Initial configuration Byte registers. Some of the bits in these

registers are reserved, and are referred to as RFU (reserved for

future use) in the following section.

B8

B7

B6

B5

B4

B3

B2

B1

B[7:0]: Input Pin Report Generator. A ‘1’ causes this bit to be

reported in the corresponding report generated when the device

is polled for the status. The device accepts only the following bit

patterns as valid. B[7:0] control the functionality for pin inputs

B[8:1] respectively.

Roller Configuration Byte (Address 0)

D7

D6 D5 D4

D3 D2 D1

D0

00000000

00000001

00000011

00000111

00001111

00011111

00111111

01111111

11111111

IS3

IS2

IS1

IS0

IOM1 IOM0

R1

R0

R[1:0]: No of roller pairs. This pair of bits configure the function-

ality of the three roller pair inputs – <H1, H2>, <V1,V2> and <H3,

H4>.

00: No rollers on this device, all roller inputs are available as

general purpose inputs

01: H1, H2 are the only roller mechanism active. The other

roller inputs are available as general purpose inputs.

10: H1, H2 and V1 and V2 are defined as roller mechanism

pairs. The other pair is still available as general purpose

inputs.

InputPinConfigurationByte1(ICB1)(Address2)

D7

D6 D5 D4

D3 D2 D1

D0

11: All the three pairs of roller inputs function as roller inputs.

IO1

IO0

EB5 EB4

EB3 EB2 EB1

EB0

It must be noted that the reassignment of the rollers must be done

onlyasfollows:Iftheapplicationneedstouseonlyoneroller–use

H1 and H2. Two rollers – use H1, H2 and V1, V2, Three rollers –

use H1, H2, V1, V2 and H3, H4. Any other choice for roller use is

illegal and results in unpredictable device behavior.

EB[5:0]: Input Pin Report Generator, Extended byte. The func-

tionality of this register is influenced by the roller configuration

byte.A‘1’causesthisbittobereportedinthecorrespondingreport

generated when the device is polled for the status. EB0 corre-

sponds to H3 and EB1 corresponds to H4. EB2 corresponds to V1

and EB3 corresponds to V2. EB4 corresponds to H1 and EB5

corresponds to H2.

IOM[1:0]: I/O functionality of the O0 and O1 pins. When IOM0 is

set to ‘0’, the O0 bit functions as an output. When set to ‘1’ it

becomes an input. . When IOM1 is set to ‘0’, the O1 bit functions

as an output. When set to ‘1’ it becomes an input. The only valid

combinations for these bits are 00, 01 and 11 respectively.

00000000

00000001

00000011

00000111

00001111

00011111

00111111

IS[3:0]: This 4-bit value is to set the amount of current that an

external device can sink into the H1, H2, V1, V2 and H3 and H4

inputs When these bits are set to 0000 the current sink is set to 0.1

mA on each of the inputs. In can be varied in steps of 0.1mA up

to a max of 1 mA.

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USB100 rev.D

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RFU: Reserved for future use, must be set to 0.

Descriptor Setup

IO[1:0]: When the IO pins are reconfigured as inputs, a ‘1’ in the

correspondingbitpositionwillcausetheinputtobeincludedinthe

report generator.

The EEPROM stores a Descriptor Description Table (DDT) fol-

lowed by the actual descriptors (DES). The DDT begins at byte

address 8 in the EEPROM. It consists of 14 Words. Each Word

consists of two bytes – The first byte is a byte indicating the type

of descriptor (these byte values are indicated in the USB specifi-

cation). Thesecondbyteisanaddress. Thisaddressindicatesthe

first byte of this descriptor in the EEPROM. An unimplemented

descriptor table entry begins with a 00. The following table shows

a possible configuration.

Application Configuration Byte (Address 3)

D7

D6 D5 D4

D3 D2 D1

D0

FIS3

FIS2 FIS1 FIS0

KD1 KD0

F1

F0

F[1:0]: Function Select. Selects between the following

Address Map

00 : Mouse operation

01: RFU

Memory AddressRange

Data type

Descriptor Description Table

Device Descriptor

10: Joystick Operation.

11: Digital Gamepad operation

KD[1:0]: Key Debounce Select:

08-35

36-53

54-62

63-71

72-78

79-86

87-118

Config Descriptor

00: 15 Ms

01: 30 Ms

10: 45 Ms

11: 60 Ms

Interface Descriptor

Mouse HID Class Descriptor

Endpoint Descriptor

String Descriptor

FIS[3:0]: These bits select the amount of current that the ‘F’ pin

can sink, in 1 mA increments. When FIS[3:0] = “0000” The current

sink is set at 2 mA. Incrementing this count by 1 will cause the

current to be increased by 1mA The maximum value is 10 mA.

DescriptorDescriptionTable(foraboveexample)

Address

Descriptor type

Memory Offset

Remote Resume Config Byte (Address 4)

08

10

12

14

16

18

20

22

24

26

28

30

32

34

Device

Config

Interface

Mouse-HID

Endpoint

String

00

36

54

63

72

78

87

00

D7

D6 D5 D4

D3 D2 D1

D0

RFU

RFU RFU RFU

RRES RRES RRES RRES

_EN

2

1

0

RRES_EN: Remote_resume enable. This bit, when set, enables

remote resume operation.

RRES[2:0]: Duration Select. When the device has entered in

suspend mode, these bits select the duration after which an

internal “momentary wakeup” is done to check whether there has

been any movement on the rollers in the mouse mode or the

potentiometers in the joystick mode. The RRES_EN bit must be

set to 1 to enable this feature.

00

000: 15 ms

001: 30 ms

010: 45 ms

011: 60 ms

100: 75 ms

101: 90 ms

110: 105 ms

00

Roller Movement Reporting

The roller mechanism built on the USB100 is capable of interfac-

ing either to a LED-chopper wheel-Phototransistor system or a

mechanical system using a commutator with wiper contacts.

111: Reserved for future use (do not use this combination,

unpredictable operation could result)

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USB100 rev.D

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H1 or V1 or H3

H2 or V2 or H4

Negative Counting

H1 or V1 or H3

H2 or V2 or H4

Positive Counting

v

Q1

USB100

D1

D2

Q2

H1

H2

F

Schematic 1: Roller Mode of Operation

When the Roller configuration register is used to define an input

pair as roller inputs, the corresponding roller movement reporting

is enabled. In this case, internally, the roller wheel pulses are

counted and registered into an 8 bit register. One register is

available per input pair. A total of three rollers movement registers

(RMRs) are available, corresponding to the three roller mecha-

nisms available. On all the input pairs (H1, H2 or V1, V2 or H3, H4)

the positive counting sequence is defined as (0,0), (0,1), (1,1) and

(0,0) and the same sequence repeating over again. Negative

counting sequence is defined as (0,0), (1,0), (1,1) and (0,1) and

thesamesequencerepeatingagain.Eachoftheabovetransitions

will result in the counter incrementing or decrementing by one

depending on whether the rollers are moving in the positive or

negativedirection.EachtimeanINqueryissentonendpoint1,the

counter contents are transferred to a temporary holding register

and queued for transmission on the USB. When an ACK is

received for the current transaction, the counter is cleared.

Hardware Features

Roller / Potentiometer Interface

One of the key differences between the mouse and joystick

hardware implementation is that themouse uses optical encoding

v

P1

USB100

P2

H1

V1

Schematic 2 : Potentiometer Mode of

Operation for Joystick

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USB100 rev.D

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andarollerwheeltodetectmousemovement. Incontrast, joystick

usesapotentiometertodetectangularmotion.Thefunctionselect

bits [F1:0] allow the designer

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/

potentiometerinterfacetodetermineiftheseinputshavechanged

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

movement has occurred.

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

inputsareselectedfortherollermechanismdecode.Inthejoystick

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

transitionsontheHxandVxpairsareusedinthecountingprocess

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.

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

theRemoteResumeconfigurationbytetoenablethisfeature, and

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

ports to determine whether the necessary conditions for wakeup

have been met.

Crystal / Crystal Oscillator combination

OSC1

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)areintendedforsurgicalimplantintothebody,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.

Fairchild Semiconductor

Americas

Fairchild Semiconductor

Europe

Fairchild Semiconductor

Hong Kong

Fairchild Semiconductor

Japan Ltd.

Customer Response Center

Tel. 1-888-522-5372

Fax:

Tel:

+44 (0) 1793-856858

8/F, Room 808, Empire Centre

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+49 (0) 8141-6102-0

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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.

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USB100 rev.D

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型号：	USB100
厂家：	FAIRCHILD SEMICONDUCTOR
描述：	Programmable Low-Cost USB Machine (PLUM) 可编程的低成本USB设备（ PLUM ）
文件：	总8页 (文件大小：45K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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