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HEDS-9711中文资料

HEDS-9711中文资料
HEDS-9711中文资料

The module contains a single Light Emitting Diode (LED) as its light source. The light is colli-mated into a parallel beam by means of a single lens located directly over the LED. Opposite the emitter is the integrated de-tector circuit. This IC consists of multiple sets of photodetectors and the signal processing cir-cuitry necessary to produce the analog waveforms.

The codewheel/codestrip moves between the emitter and detector, causing the light beam to be in-terrupted by the pattern of spaces and bars on the codewheel/ codestrip. The photodiodes which detect these interruptions are arranged in a pattern that corre-sponds to the radius and count density of the codewheel/ codestrip. These detectors are also spaced such that a light period on one pair of detectors corresponds to a dark period on the adjacent pair of detectors. The photodiode outputs are fed through the signal processing circuitry, which produces the final outputs for channels A and B. Due to this integrated phasing technique, the analog output of channel A is in quadrature with channel B (90 degrees out of phase).Package Dimensions

See HEDS-9700 datasheet for

package outline drawings.

Definitions

Count (N): The number of bar

and window pairs or Counts Per

Revolution (CPR) of the code-

wheel, or the number of Lines Per

Inch (LPI) of the codestrip.

1 Shaft Rotation=360 mechanical

degrees

=N cycles

1 cycle (c)=360 electrical

degrees (°e)

= 1 bar and window pair

Pulse Width (P): The number of

electrical degrees that an output

is high during one cycle. This

value is nominally 180°e or 1/2

cycle.

Pulse Width Error (?P): The

deviation, in electrical degrees, of

the pulse width from its ideal

value of 180°e.

State Width (S): The number of

electrical degrees between a

transition in the output of channel

A and the neighboring transition

in the output of channel B. There

are four states per cycle, each

nominally 90°e.

State Width Error (?S): The

deviation, in electrical degrees, of

each state width from its ideal

value of 90°e.

Phase (Φ): The number of elec-

trical degrees between the center

of the high state of channel A and

the center of the high state of

channel B. This value is nomi-

nally 90°e for quadrature output.

Phase Error (?Φ): The devia-

tion of the phase from its ideal

value of 90°e.

Direction of Rotation: When

the codewheel rotates counter-

clockwise, as viewed looking

down on the module (so the

marking is visible), channel A will

lead channel B. If the codewheel

rotates in the opposite direction,

channel B will lead channel A.

Optical Radius (R OP): The

distance from the codewheel’s

center of rotation to the optical

center (O.C.) of the encoder

module.

Mounting Position (R M):

Distance from Motor Shaft center

of rotation to center of Alignment

Tab receiving hole.

Absolute Maximum Ratings

Parameter Symbol Min.Max.Units Notes Storage Temperature T S–4085°C

Operating Temperature T A1545°C

Supply Voltage V CC–0.57V

Soldering Temperature260°C t ≤ 5 sec.

Recommended Operating Conditions

Parameter Symbol Min.Max.Units Notes Temperature T1545

Supply Voltage V CC 4.8 5.2V Ripple < 100 mV p-p Count Frequency8kHz(Velocity (rpm) x N) 60

Waveform Definition

ANALOG

Iap Ibp

A

B

Iam

DIGITAL

A

B

Name Paramenter Definition Label Analog Peak The absolute value in μA of the magnitude of the Iap, Ibp,

analog signal (i.e., one-sided reading).Iam, Ibm Analog Peak-to-Peak Ipp The peak-to-peak signal magnitude in μA of the Iapp

analog signal.Ibpp Analog Offset Ioffset The offset in μA from the mid-point of the analog

peak-to-peak signal to the zero current point.

State Width State Width The number of electrical degrees between a transition State 1

in channel A and the neighboring transition in channel B.State 2

There are four states per cycle, each nominally 90°e.State 3

The transitions are determined by where the analog State 4

signal crosses the Zero point.

State Width Error State Width Error The deviation, in electrical degrees, of each state width

from its ideal value of 90°e.

Pulse Width Pulse Width The number of electrical degrees that an analog output P

is greater than zero during one cycle. This value is

nominally 180°e or 1/2 cycle.

Pulse Width Error Pulse Width Error The deviation, in electrical degrees, of each pulse width

from its ideal value of 180°e.

Electrical Characteristics

Electrical Characteristics over Recommended Operating Range, Typical at 25°C.

Parameter Symbol Min.Typ.Max.Units Notes Supply Current I CC1740mA

Encoding Characteristics

Encoding Characteristics over Recommended Operating Range and Recommended Mounting Tolerances.

These characteristics do not include codewheel/codestrip contributions.

Units

Radial microns± 130

Tangential microns± 130

Gap microns50 – 250 Temperature°C15 – 45

O.R.mm18 – Linear

CPR count900 – Linear Codewheel Slot/Spoke ratio0.9 – 1.1

Min.Max.

IppμA1073

IoffsetμA–4+4

State Width Error e°–40+40

Pulse Width Error e°–40+40 Recommended Codewheel and Codestrip Characteristics

Analog Encoder Interface Circuit

I

A

I

B

V REF = 1.4 V ± 0.2 V (DC)The circuit shown can be used to convert the current output to a voltage. Resistor value, R1, and Capacitor, C, are specified to attain required gain and low-pass filtering, which are application specific. The gain is chosen to attain maximum output swing and not clamp the op-amp. V REF should be set to 1.4 V ± 0.2 V.

A 0.1 μF bypass capacitor (decoupling capacitor) is recom-mended to be placed within 1 cm of the encoder for optimal power supply noise rejection. Outputs are high impedance (typical 1

M ohm) and susceptible to EMI.

Ordering Information HEDS-971

Lead Configurations

0 – straight leads

1 – bent leads

Resolutions

R – 200 lpi

Option

Bracket Options

50

51

Package Dimensions Option 50

Package Dimensions Option 51

FOR DETAILS)

C H B

V C C

C H A

G N D

LEAD THICKNESS = 0.25 mm LEAD PITCH = 2.54 mm

C H B

V C C

C H A

G N D

LEAD THICKNESS = 0.25 mm LEAD PITCH = 2.54 mm

FOR DETAILS)

Package Dimensions Bent Version – Option 50

Package Dimensions Bent Version – Option 51

LEAD THICKNESS = 0.25 mm LEAD PITCH = 2.54 mm

FOR DETAILS)

LEAD THICKNESS = 0.25 mm LEAD PITCH = 2.54 mm

FOR DETAILS)

Mounting Considerations

Note: These dimensions include shaft end play and codewheel warp.

All dimensions for mounting the module and codewheel/codestrip should be measured with respect to the two mounting posts, shown above.

Mounting Tolerances

Case 1 specifies the mounting tolerances required on Rm in order to achieve the respective encoding characteristics shown on page 4. The mounting tolerances are as follows:

Case 1: Rm ± 0.13 mm (.005 inches)

Recommended Screw Size: M2.5 x 0.45 or 2-56

https://www.wendangku.net/doc/ba6724725.html,/semiconductors

For product information and a complete list of

distributors, please go to our web site.

For technical assistance call:

Americas/Canada: +1 (800) 235-0312 or

(408) 654-8675

Europe: +49 (0) 6441 92460

China: 10800 650 0017

Hong Kong: (+65) 6271 2451

India, Australia, New Zealand: (+65) 6271 2394

Japan: (+81 3) 3335-8152(Domestic/Interna-

tional), or 0120-61-1280(Domestic Only)

Korea: (+65) 6271 2194

Malaysia, Singapore: (+65) 6271 2054

Taiwan: (+65) 6271 2654

Data subject to change.

Copyright ? 2002 Agilent Technologies, Inc.

Obsoletes 5988-3614EN

May 10, 2002

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