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MLX90255BA 데이터시트 PDF




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부품번호 MLX90255BA 기능
기능 Linear Optical Array
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MLX90255BA 데이터시트, 핀배열, 회로
www.DataSheet4U.com
Datasheet MLX90255BA
Linear Optical Array
Features and Benefits
128 x 1 Sensor-Element Organization (1 Not Connected, 1 dummy, 128 real, 1 dummy
and 1 Dark Pixel)
385 Dots-Per-Inch (DPI) Sensor Pitch
High Linearity and Uniformity for 256 Gray-Scale (8-Bit) Applications
High Sensitivity: 1.7V @ 10µW/cm² @ 0.7ms integration time
Special Gain Compensation for use with single LED light source
Output Referenced to Ground
Low Image Lag
Single 5V Supply
Replacement for Texas Instruments TSL1301 & TSL1401 and MLX90255AA
Operation to 1MHz
Applications
Position Sensing
Electrical Power Assist Steering (EPAS)
Spectrometer Applications
Ordering Information
Part No.
MLX90255
MLX90255
Temperature Suffix
K
K
Package
LA
JA
Option
-BA
-BA
Temperature Range
-40°C to 125°C Automotive
-40°C to 125°C Automotive
Functional Diagram
Pixel 1
Integrator Reset
Pixel 2
Pixel 132
43
Sample
Switching Logic
Hold Q1
132-Bit Shift Register
Q2
21
Q132
External
Load
5
Description
The MLX90255BA linear sensor array consists
of a 128 x 1 array of photodiodes, associated
charge amplifier circuitry and a pixel data-hold
function that provides simultaneous-integration
start and stop times for all pixels. The pixels
measure 200µm (H) by 66 µm (W) and 8 µm
spacing between pixels. Operation is simplified
by internal control logic that requires only a
serial-input (SI) signal and a clock.
The sensor consists of 128 photodiodes
arranged in a linear array. Light energy falling on
a photodiode generates photocurrent, which is
integrated by the active integration circuitry
associated with that pixel. During the integration
period, a sampling capacitor connects to the
output of the integrator through an analog
switch. The amount of charge accumulated at
each pixel is directly proportional to the light
intensity and the integration time. The output
and reset of the integrators is controlled by a
132-bit shift register and reset logic. An output
cycle is initiated by clocking in a logic 1 on SI.
This causes all 132 sampling capacitors to be
disconnected from their respective integrators
and starts an integrator reset period.
(continued on page 4)
MLX90255BA Linear Optical Array
3901090255
Page 1
Rev 1.2 08-Aug-01




MLX90255BA pdf, 반도체, 판매, 대치품
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Datasheet MLX90255BA
Linear Optical Array
General Description
(continued from page 1)
As the SI pulse is clocked through the shift
register, the charge stored on the sampling
capacitors is sequentially connected to a charge-
coupled output amplifier that generates a voltage
on the analog output AO. Two dummy pixel
values are shifted out first, then the 128 actual
pixel bits, followed by two additional dummy
pixel bits, for a total of 132 data bits. Although
there are only 132 pixels, 133 clock pulses are
necessary for a complete shift out. The final
pulse is used to re-initialize the shift register.
The integrator reset period ends 18 clock cycles
after the SI pulse is clocked in. So the light-
integration starts after the 18th CLK pulse. The
light-integration ends at the next SI pulse.
Between the end of the 133th clock pulse and the
next SI pulse, a minimum time of 10µs is
necessary for an effective S&H function. So the
minimum integration time of the MLX90255BA is
(133 -18) * Ts + 10µs and thus dependent on
clock speed. (Ts = clock period) After the 132
data bits are clocked out, the output becomes
high impedance. (see figure) The AO is driven
by a source follower that requires an external
pulldown resistor. (typically 330Ω) The output is
nominally 125mV for no light input and 2.4V for a
nominal full-scale output. The pixel gain is 15%
bigger at the edges than in the middle (cosine
correction) in order to get a flat output when
illuminating the device with a single LED light
source.
The MLX90255BA is intended for use in a wide
variety of applications, including: image
scanning, mark and code reading, optical
character recognition (OCR) and contact
imaging, edge detection and positioning, and
optical linear and rotary encoding. The
MLX90255BA is a replacement for the Texas
Instruments' TSL1301 and TSL1401 parts.
Absolute Maximum Ratings
Supply Voltage, Vdd
+7V
Digital Input Current Range
-20 to 20 mA
Operating Free-Air temperature -40°C to 125°C
range, Ta
(automotive compliant
optical package)
Storage temperature range,
Tstg
-40°C to 125°C
Lead Temperature
260°C
1.6mm (1/16 inch) from case for
10 seconds
Stresses beyond those listed under "absolute
maximum ratings" may cause permanent
damage to the device.
These are stress ratings only, and functional
operation of the device at these or any other
conditions beyond those indicated under
"recommended operating conditions" is not
implied.
Exposure to absolute-maximum -rated
conditions for extended periods may affect
device reliability.
MLX90255BA Linear Optical Array
3901090255
Page 4
Rev 1.2 08-Aug-01

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MLX90255BA 전자부품, 판매, 대치품
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Datasheet MLX90255BA
Linear Optical Array
MLX90255BA (SMD8) LA package dimensions
8 76 5
1234
MLX90255BA Linear Optical Array
3901090255
Page 7
Rev 1.2 08-Aug-01

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MLX90255BA

Linear Optical Array

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