TCS34725FN View Datasheet(PDF) - austriamicrosystems AG
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TCS34725FN Datasheet PDF : 40 Pages
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TCS3472 − Principles of Operation
Figure 21:
Power Management
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.
System State
Machine State
Wait
RGBC Init
RGBC ADC
Programmable
Parameter
WTIME
WLONG
Programmed
Value
0xEE
0
ATIME
0xEE
Duration
43.2 ms
2.40 ms
43.2 ms
Typical
Current
0.065 mA
0.235 mA
0.235 mA
Figure 22:
Average IDD Current
WEN
0
1
1
1
1
WTIME
n/a
0xFF
0XEE
0x00
0x00
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.
WLONG
n/a
0
0
0
1
WAIT State
0 ms
2.40 ms
43.2 ms
614 ms
7.37 s
Average IDD Current
291 μA
280 μA
152 μA
82 μA
67 μA
Page 18
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[v1-02] 2016-Feb-08
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