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TCS3414 参数 Datasheet PDF下载

TCS3414图片预览
型号: TCS3414
PDF下载: 下载PDF文件 查看货源
内容描述: 数字色彩传感器 [DIGITAL COLOR SENSORS]
分类和应用: 传感器
文件页数/大小: 40 页 / 348 K
品牌: TAOS [ TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS ]
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TCS3404, TCS3414  
DIGITAL COLOR SENSORS  
TAOS137A − APRIL 2011  
PRINCIPLES OF OPERATION  
Analog-to-Digital Converter  
The TCS3404/14 contains four integrating analog-to-digital converters (ADC) that integrate the currents from  
the four photodiodes (channel 1 through channel 4). Integration of all four channels occurs simultaneously, and  
upon completion of the conversion cycle the conversion results are transferred to the channel data registers,  
respectively. The transfers are double-buffered to ensure that invalid data is not read during the transfer. After  
the transfer, the device automatically begins the next integration cycle.  
There are two ways to control the integration cycles: internally timed and externally timed. Internally-timed  
integration cycles can either be continuous back-to-back conversions or can be externally triggered as a single  
event using the SYNC pin. Externally-timed integrations can be controlled by setting and clearing a register bit  
(i.e. ADC_EN in Control Register) using the serial interface, or by 1 or more pulses input to the SYNC pin.  
Integration options are configured through the Timing Register (see the Timing Register section for more  
information).  
Digital Interface  
Interface and control of the TCS3404/14 is accomplished through a two-wire serial interface to a set of registers  
that provide access to device control functions and output data. The serial interface is compatible with System  
2
Management Bus (SMBus) versions 1.1 and 2.0, and I C bus Fast-Mode.  
The TCS3404/14 device supports a single slave address outlined in Table 1. Additional devices shown in the  
2
Available Options table on page 3 support additional I C slave addresses for systems requiring more than one  
device.  
Table 1. Slave Address  
SLAVE ADDRESS  
SMB ALERT ADDRESS  
0111001  
0001100  
2
NOTE: The slave and SMB Alert addresses are 7 bits. Please note the SMBus and I C protocols on the following pages. A read/write bit should  
be appended to the slave address by the master device to communicate properly with the device.  
Interrupt  
Although the ADC channel data registers can be read at any time to obtain the most recent conversion value,  
in some applications, periodic polling of the device may not be desirable. For these types of applications, the  
device supports a variety of interrupt options allowing the user to configure the device to signal when a change  
in light intensity has occurred. High and low threshold registers allow a range of light levels to be defined, outside  
of which the device generates an interrupt. A persistence setting allows the user to specify a time duration that  
the measured value must remain outside of the defined range before generating an interrupt. The interrupt  
function can be assigned to any one of the four ADC color channels. See Interrupt Control Register for more  
information on configuring the interrupt functions.  
Copyright E 2011, TAOS Inc.  
The LUMENOLOGY r Company  
r
r
www.taosinc.com  
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