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參數(shù)資料
| 型號(hào)： | TSL237T |
| 廠商： | AMS-TAOS USA Inc |
| 文件頁數(shù)： | 6/13頁 |
| 文件大?。?/td> | 621K |
| 描述： | IC LIGHT TO FREQUENCY CONV 4-TMB |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 傳感器類型： | 光轉(zhuǎn)頻率轉(zhuǎn)換器 |
| 輸出類型： | 數(shù)字 |
| 其它名稱： | TSL237-TDKR |
TSL237T
HIGH-SENSITIVITY
LIGHT-TO-FREQUENCY CONVERTER
TAOS055J DECEMBER 2007
5
The LUMENOLOGY r Company
r
r
Copyright E 2007, TAOS Inc.
www.taosinc.com
APPLICATION INFORMATION
Power-Supply Considerations
Power-supply lines must be decoupled by a 0.01-糉 to 0.1-糉 capacitor with short leads placed close to the
TSL237T (Figure 9). A low-noise power supply is required to minimize jitter on output pulse.
TSL237T
Timer/Port
MCU
0.1 ?/SPAN>F
V
DD
V
DD
OUT
GND
OE
Figure 9. Typical TSL237T Interface to a Microcontroller
Device Operational Details
The frequency at the output pin (OUT) is given by:
f
O
= f
D
+ (R
e
) (E
e
)
where:
f
O
is the output frequency
f
D
is the output frequency for dark condition (E
e
= 0)
R
e
is the device responsivity for a given wavelength of light given in kHz/(糤/cm
2
)
E
e
is the incident irradiance in 糤/cm
2
f
D
is a constant error term in the output frequency calculation resulting from leakage currents, and is
independent of light intensity. The TSL237T die is trimmed to minimize the magnitude of this dark frequency
component so that it can be neglected in the transfer function calculation. In many applications, measurement
of the actual dark frequency may be impractical due to measurement times ranging from several seconds to
several minutes, and the fact that some devices may never transition (zero dark frequency).
Input Interface
A low-impedance electrical connection between the device OE
terminal and the device GND terminal is required
for improved noise immunity.
Output Interface
The output of the device is designed to drive a CMOS logic input over short distances. If lines greater than 12
inches in length are used on the output, a buffer or line driver is recommended.
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