TCS34721 datasheet(18/40 Pages) AMSCO

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[v1-02] 2016-Feb-08

TCS3472 − Principles of Operation

Power Management

Power consumption can be managed with the Wait state,

because the Wait state typically consumes only 65 μA of IDD

current. An example of the power management feature is given

below. With the assumptions provided in the example, average

IDD is estimated to be 152 μA.

Figure 21:

Power Management

Average IDD Current = ((43.2 × 0.065) + (43.2 × 0.235) +

(2.40 × 0.235)) / 89 ≈ 152 μA

Keeping with the same programmed values as the example,

Figure 22 shows how the average IDD current is affected by the

Wait state time, which is determined by WEN, WTIME, and

WLONG. Note that the worst-case current occurs when the Wait

state is not enabled.

Figure 22:

Average IDD Current

System State

Machine State

Programmable

Parameter

Programmed

Value

Duration

Typical

Current

Wait

WTIME

0xEE

43.2 ms

0.065 mA

WLONG

RGBC Init

2.40 ms

0.235 mA

RGBC ADC

ATIME

0xEE

43.2 ms

0.235 mA

WEN

WTIME

WLONG

WAIT State

Average IDD Current

n/a

0 ms

291

μA

0xFF

2.40 ms

280

μA

0XEE

43.2 ms

152

μA

0x00

614 ms

μA

10x00

7.37 s

μA

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