TCS3404 Datasheet, PDF (29/40 Pages) TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS – DIGITAL COLOR SENSORS

TCS3404, TCS3414
DIGITAL COLOR SENSORS
APPLICATION INFORMATION: SOFTWARE
TAOS137A − APRIL 2011
A synchronization input (SYNC IN) is supported to precisely start/stop sensor integration and synchronize with
the light source. The TIMING Register (01h) provides two synchronization modes of operation. The first mode
of operation synchronizes the SYNC IN pin for one integration cycle as specified in the Timing Register (01h).
When the rising edge of the signal is detected, the TCS3404/14 begins integration. The second mode
accumulates a specified number of SYNC IN pulses (see Timing Register) in which the minimum pulse width
is 50 μs. A pulse counter is used to count the rising and falling edges of the pulse(s) and precisely integrate the
light level when the SYNC IN pulse is high.
The following pseudo code illustrates a procedure for reading the TCS3404/14 device using the synchronization
feature:
// Synchronize one integration cycle
// See ”Basic Operation” to power−on and start device
// See ”Configuring the Timing Register” to setup environment
Address = 0x39
Command = 0x81
Data = 0x21
//Slave addr − also 0x29 or 0x49
//Set Command bit and address Timing Register
//Sync one 100ms integration period
//External SYNC IN pulse initiates 100ms integration
Sleep (100)
// See ”Basic Operation” to read Data Registers using Byte or Word Protocol
// Synchronize N number of SYNC IN pulses
// See ”Basic Operation” to power−on and start device
// See ”Configuring the Timing Register” to setup environment
Address = 0x39
Command = 0x81
Data = 0x30
//Slave addr − also 0x29 or 0x49
//Set Command bit and address Timing Register
//Integrate one SYNC IN pulse
//External SYNC IN pulse synchronizes integration
// See ”Basic Operation” to read Data Registers using Byte or Word Protocol
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