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參數資料
型號: TSL208R
廠商: AMS-TAOS USA Inc
文件頁數: 3/11頁
文件大小: 580K
描述: IC LINEAR SENSOR ARRAY 512X1
標準包裝: 40
系列: *
其它名稱: TSL208-R
TSL208R
512 y 1 LINEAR SENSOR ARRAY
TAOS031G  AUGUST 2011
2
r
r
Copyright E 2011, TAOS Inc.
The LUMENOLOGY r Company
www.taosinc.com
Terminal Functions
TERMINAL
NAME
NO.
I/O
DESCRIPTION
AO
4
O
Analog output.
CLK
3
I
Clock. The clock controls the charge transfer, pixel output and reset.
GND
5
I
Ground (substrate). All voltages are referenced to the substrate.
SI
2
I
Serial input. SI defines the start of the data out sequence.
SO
6
O
Serial output. SO signals the end of the data out sequence.
VDD
1, 7
I
Supply voltage for both analog and digital circuits.
Detailed Description
The sensor consists of 512 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 integration time is the interval between two consecutive output periods.
The output and reset of the integrators is controlled by a 512-bit shift register and reset logic. An output cycle
is initiated by clocking in a logic 1 on SI for one positive going clock edge (see Figures1 and 2)
 
. As the SI pulse
is clocked through the 512-bit shift register, the charge on the sampling capacitor of each pixel is sequentially
connected to a charge-coupled output amplifier that generates a voltage output, AO. When the bit position goes
low, the pixel integrator is reset. On the 513
th
 clock rising edge, the SI pulse is clocked out of the shift register
and the output assumes a high-impedance state. Note that this 513
th
 clock pulse is required to terminate the
output of the 512
th
 pixel and return the internal logic to a known state. A subsequent SI pulse can be presented
as early as the 514
th
 clock pulse, thereby initiating another pixel output cycle.
The voltage developed at analog output (AO) is given by:
V
out
 = V
drk
 + (R
e
) (E
e
) (t
int
)
where:
V
out
is the analog output voltage for white condition
V
drk
is the analog output voltage for dark condition
R
e
is the device responsivity for a given wavelength of light given in V/(糐/cm
2
)
E
e
is the incident irradiance in 糤/cm
2
t
int
is integration time in seconds
AO is driven by a source follower with an internal 330-?pulldown resistor (no external resistor is required). The
output is nominally 0 V for no light input, 2 V for normal white-level, and 3.4 V for saturation light level. When
the device is not in the output phase, AO is in a high impedance state.
A 0.1 糉 bypass capacitor should be connected between V
DD
 and ground as close as possible to the device.
 
For proper operation, after meeting the minimum hold time condition, SI must go low before the next rising edge of the clock.
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