ams Datasheet

Page 17

[v1-02] 2016-Feb-08

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TCS3472 − Principles of Operation

System Timing

The system state machine shown in Figure 17 provides an

overview of the states and state transitions that provide system

control of the device. This section highlights the programmable

features, which affect the state machine cycle time, and

provides details to determine system level timing.

When the power management feature is enabled (WEN), the

state machine will transition to the Wait state. The wait time is

determined by WLONG, which extends normal operation by

12× when asserted, and WTIME. The formula to determine the

wait time is given in the box associated with the Wait state in

Figure 20.

When the RGBC feature is enabled (AEN), the state machine will

transition through the RGBC Init and RGBC ADC states. The

RGBC Init state takes 2.4 ms, while the RGBC ADC time is

dependent on the integration time (ATIME). The formula to

determine RGBC ADC time is given in the associated box in

Figure 20. If an interrupt is generated as a result of the RGBC

cycle, it will be asserted at the end of the RGBC ADC.

Figure 20:

Detailed State Diagram

Notes:

1. There is a 2.4 ms warm-up delay if PON is enabled. If PON is not enabled, the device will return to the Sleep state as shown.

2. PON, WEN, and AEN are fields in the Enable register (0x00).