TSL2569CS datasheet(35/56 Pages) OSRAM

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[v1-00] 2016-Apr-12

TSL2568, TSL2569 − Application Information: Software

An interrupt will be generated upon completion of each

conversion. The interrupt threshold registers are ignored. The

following example illustrates the configuration of a level

interrupt:

// Set up end-of-conversion interrupt, Level style

Address = 0x39

//Slave addr also 0x29 or 0x49

Command = 0x86

//Address Interrupt Register

Data = 0x10

//Level style, every ADC cycle

WriteByte (Address, Command, Data))

The following example pseudo code illustrates the

configuration of an SMB Alert style interrupt when the light

intensity changes 20% from the current value, and persists for

3 conversion cycles:

// Read current light level

Address = 0x39

//Slave addr also 0x29 or 0x49

Command = 0xAC

//Set Command bit and Word bit

ReadWord (Address, Command, DataLow, DataHigh)

Channel0 = (256 * DataHigh) + DataLow

//Calculate upper and lower thresholds

T_Upper = Channel0 + (0.2 * Channel0)

T_Lower = Channel0 – (0.2 * Channel0)

//Write the lower threshold register

Command = 0xA2

//Addr lower threshold reg, set Word Bit

WriteWord (Address, Command, T_Lower.LoByte, T_Lower.HiByte)

//Write the upper threshold register

Command = 0xA4

//Addr upper threshold reg, set Word bit

WriteWord (Address, Command, T_Upper.LoByte, T_Upper.HiByte)

//Enable interrupt

Command = 0x86

//Address interrupt register

Data = 0x23

//SMBAlert style, PERSIST = 3

WriteByte (Address, Command, Data)

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