TSL2672(2016) View Datasheet(PDF) - austriamicrosystems AG

Part Name

Description

MFG CO.

TSL2672
(Rev.:2016)

Digital Proximity Detector

austriamicrosystems AG 

TSL2672 − Principles Of Operation

Figure 24:

Power Management

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 167 μA.

System State

Machine State

Prox Init

Prox Accum

Prox Accum − LED ON

Prox Accum − LED OFF

Prox Wait

Prox ADC

Wait

Programmable

Parameter

PPULSE

PTIME

WTIME

WLONG

Programmed

Value

0x04

0xFF

0xEE

0

Duration

2.73 ms

0.064 ms

0.029 ms (1)

0.035 ms(2)

2.73 ms

2.73 ms

49.2 ms

Typical

Current

0.200 mA

119 mA

0.200 mA

0.200 mA

0.200 mA

0.090 mA

Note(s):

1. Prox Accum - LED ON time = 7.3μs 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

Average IDD Current = ((0.029 × 119) + (0.035 × 0.200) + (2.73 ×

0.200) + (49.2 × 0.090) + (2.73 × 0.200 × 2)) / 57 ≈ 167 μA

Keeping with the same programmed values as the example,

Figure 25 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.

ams Datasheet

[v1-00] 2016-Mar-23

Page 21

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