TSL2561CL TAOS, TSL2561CL Datasheet - Page 22

• Manufacturer Part Number: TSL2561CL
• Description: Light to Digital Converters Ambient Light Sensor Light to Digital
• Manufacturer: TAOS

Specifications of TSL2561CL

• Data Bus Width: 20 bit
• Peak Wavelength: 640 nm, 940 nm
• Maximum Operating Frequency: 780 KHz
• Operating Supply Voltage: 2.7 V to 3.6 V
• Operating Current: 0.6 mA to 15 uA
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: - 30 C
• Interface Type: I2C
• Maximum Fall Time: 300 ns
• Maximum Rise Time: 300 ns
• Mounting Style: SMD/SMT
• Resolution: 16 bit
• Package / Case: Chip LED
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

TSL2560, TSL2561
LIGHT-TO-DIGITAL CONVERTER
TAOS059N − MARCH 2009
// Read current light level
// Generate an interrupt
22
Copyright E 2009, TAOS Inc.
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:
In order to generate an interrupt on demand during system test or debug, a test mode (INTR = 11) can be used.
The following example illustrates how to generate an interrupt on demand:
Address = 0x39
Command = 0xAC
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
WriteWord (Address, Command, T_Lower.LoByte, T_Lower.HiByte)
//Write the upper threshold register
Command = 0xA4
WriteWord (Address, Command, T_Upper.LoByte, T_Upper.HiByte)
//Enable interrupt
Command = 0x86
Data = 0x23
WriteByte(Address, Command, Data)
Address = 0x39
Command = 0x86
Data = 0x30
WriteByte(Address, Command, Data)
//Interrupt line should now be low
APPLICATION INFORMATION: SOFTWARE
r
www.taosinc.com
//Slave addr also 0x29 or 0x49
//Set Command bit and Word bit
//Addr lower threshold reg, set Word Bit
//Addr upper threshold reg, set Word bit
//Address interrupt register
//SMBAlert style, PERSIST = 3
//Slave addr also 0x29 or 0x49
//Address Interrupt register
//Test interrupt
r
The LUMENOLOGY r Company