TCS3771 Datasheet, PDF (10/33 Pages) ams AG – COLOR LIGHT-TO-DIGITAL CONVERTER with PROXIMITY SENSING

TCS3771
COLOR LIGHT-TO-DIGITAL CONVERTER
with PROXIMITY SENSING
TAOS110A − MARCH 2011
PRINCIPLES OF OPERATION
System State Machine
The TCS3771 provides control of RGBC, proximity detection, and power management functionality through an
internal state machine (Figure 7). After a power-on-reset, the device is in the sleep mode. As soon as the PON
bit is set, the device will move to the start state. It will then continue through the Prox, Wait, and RGBC states.
If these states are enabled, the device will execute each function. If the PON bit is set to 0, the state machine
will continue until all conversions are completed and then go into a low power sleep mode.
lid ^Sleep
PON = 1 (r 0:b0)
PON = 0 (r 0:b0)
a _Start
v _Prox
RGBC
ill Wait
G ^{t Figure 7. Simplified State Diagram}
s _{NOTE: In this document, the nomenclature uses the bit field name in italics followed by the register number and}
A ^t _{bit number to allow the user to easily identify the register and bit that controls the function. For example, the}
Technicaaml ^{sconten power on (PON) is in register 0, bit 0. This is represented as PON (r0:b0).}
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