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參數(shù)資料
| 型號： | TSLW1401 |
| 英文描述： | Optoelectronic |
| 中文描述： | 光電 |
| 文件頁數(shù)： | 2/10頁 |
| 文件大?。?/td> | 123K |
| 代理商： | TSLW1401 |
TSLW1401
EXTENDED TEMPERATURE
128 1 LINEAR SENSOR ARRAY WITH HOLD
TAOS024A – JUNE 2001
2
www.taosinc.com
Copyright 2001, TAOS Inc.
Terminal Functions
TERMINAL
NAME
DESCRIPTION
NO.
AO
3
Analog output.
CLK
2
Clock. The clock controls charge transfer, pixel output, and reset.
GND
5,6,7,8
Ground (substrate). All voltages are referenced to the substrate.
SI
1
Serial input. SI defines the start of the data-out sequence.
V
DD
4
Supply voltage. Supply voltage for both analog and digital circuits.
Detailed Description
The sensor consists of 128 photodiodes arranged in a linear array. Light energy impinging 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 128-bit shift register and reset logic. An output cycle
is initiated by clocking in a logic 1 on SI. For proper operation, after meeting the minimum hold time condition,
SI must go low before the next rising edge of the clock. An internal signal, called Hold, is generated from the
rising edge of SI and transmitted to analog switches in the pixel circuit. This causes all 128 sampling capacitors
to be disconnected from their respective integrators and starts an integrator reset period. 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 analog output AO. Simultaneously, during the first
18 clock cycles, all pixel integrators are reset, and the next integration cycle begins on the 19th clock. On the
129th clock rising edge, the SI pulse is clocked out of the shift register and the analog output AO assumes a
high impedance state. Note that this 129th clock pulse is required to terminate the output of the 128th pixel, and
return the internal logic to a known state. A subsequent SI pulse may be presented as early as the 130th clock
pulse, thereby initiating another pixel output cycle.
AO is driven by a source follower that requires an external pulldown resistor. When the output is not in the output
phase, it is in a high-impedance state. The output is nominally 0 V for no light input and 2 V for a nominal
white-level output.
The voltage developed at analog output (AO) is given by:
V
out
= V
drk
+ (R
e
) (E
e
)(t
int
)
where:
V
out
V
drk
R
e
E
e
t
int
is the analog output voltage for white condition
is the analog output voltage for dark condition
is the device responsivity for a given wavelength of light given in V/(
μ
J/cm
2)
is the incident irradiance in
μ
W/cm
2
is integration time in seconds
The TSL1401 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.
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