TMD27721 datasheet(25/59 Pages) AMSCO

25 / 59 page

ams Datasheet, Confidential

Page 25

[v1-20] 2014-Jul-21

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TMD2772/ TMD2772WA − Principles of Operation

Power Management

Power consumption can be managed with the Wait state,

because the Wait state typically consumes only 90μA 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 176μA.

Figure 29:

Power Management

Note(s) and/or Footnote(s):

1. Prox Accum − LED On time = 7.3 μs per pulse × 4 pulses = 29.3μs = 0.029 ms

2. Prox Accum − LED Off time = 8.7 μs per pulse × 4 pulses = 34.7μs = 0.035 ms

System State

Machine State

Programmable

Parameter

Programmed

Value

Duration

Typical

Current

Prox Init

2.73 ms

0.195 mA

Prox Accum

PPULSE

0x04

0.064 ms

Prox Accum − LED On

0.029 ms (1)

103 mA

Prox Accum − LED OFF

0.035 ms (2)

0.195 mA

Prox Wait

2.73 ms

0.195 mA

Prox ADC

PTIME

0xFF

2.73 ms

0.195 mA

Wait

WTIME

0xEE

49 2 ms

0 090 mA

WLONG

ALS Init

2.73 ms

0.195 mA

ALS ADC

ATIME

0xEE

49 2 ms

0.195 mA

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