參數(shù)資料
型號(hào): TSL2550
廠商: Electronic Theatre Controls, Inc.
英文描述: AMBIENT LIGHT SENSOR WITH SMBus INTERFACE
中文描述: 常溫與SMBus接口光傳感器
文件頁數(shù): 11/14頁
文件大小: 147K
代理商: TSL2550
TSL2550
AMBIENT LIGHT SENSOR
WITH SMBus INTERFACE
TAOS029 – SEPTEMBER 2002
11
The LUMENOLOGY Company
Copyright 2002, TAOS Inc.
www.taosinc.com
Operation
After applying VDD, the device will initially be in the power down state. To operate the device, issue an SMBus
Send Byte protocol with the device address and the appropriate command byte to read ADC channel 0 or ADC
channel 1 (see Table 2). To obtain the conversion result, issue an SMBus Receive Byte protocol with the device
address. The data byte received will correspond to the value in the ADC register (0 or 1) specified by the previous
command. If a conversion has not been completed since power up (either through V
DD
or ADCEN/PON), the
valid bit will be 0, and the data will not be valid. If there is a valid conversion result available, the valid bit will
be set (1), and the remaining 7 bits will represent valid data from the previously selected ADC register. Data
may be read repeatedly from the currently selected ADC register, and although it will remain valid, the ADC
register will not be updated until a new conversion completes for that channel (800 ms total since there are two
serial 400 ms per channel conversion times). Note also that the command register itself may be read, as a check
to be sure that the device is communicating properly.
To power down the device for reduced power consumption, issue an SMBus Send Byte protocol with the device
address followed by 0 to clear the ADCEN and PON bits.
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