LS521 datasheet(5/12 Pages) SITI

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LS521

點晶科技股份有限公司

SILICON TOUCH TECHNOLOGY INC.

ILLUMINATION-TO-DIGITAL CONVERTER with SMBUS INTERFACE

Version

：A.002

Page4

Max. illuminance range(LUX)

1000

2000

5000

14000

RL(KΩ )

2.4

0.857

For example, if we need the maximum illuminance range to be 2000 lux, then

REJECTION OF LIGHT RIPPLE

Cut off frequency(Hz)

RL (kΩ )

2.4

CL (uF)

0.45

1.2

For example, if light ripple(f)=60Hz, RL=6kΩ , then

AC OPERATING CHARACTERISTICS (VDD=3V, TA=25℃ unless otherwise noted)

Item

Symbol

Min.

Typ.

Max.

Unit

Clock frequency

f(SMBCLK)

400

kHz

Bus free time between start and stop condition

t(BUF)

4.7

Hold time after (repeated) start condition. After this

period, the first clock is generated.

t(HDSTA)

Repeated start condition setup time

t(SUSTA)

4.7

Stop condition setup time

t(SUSTO)

Data hold time

t(HDDAT)

300

Data setup time

t(SUDAT)

250

SMBCLK clock low period

t(LOW)

4.7

SMBCLK clock high period

t(HIGH)

Detect clock low timeout

t(TIMEOUT)

Clock/data fall time

300

Clock/data rise time

1000

Input pin capacitance

PARAMETER MEASUREMENT INFORMATION

Table 1. Maximum illuminance range vs RL

)

(

2000

1200









where 1200 and 0.1 are constants, 2000 is max. lux

Table 2.

RL , CL setting

)

(

4421

6000













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