VL6180X: What is the power consumption of this device ?

[Nickname2530_O]

Posted on June 24, 2014 at 09:54

Dear,

What is the power consumption of VL6180X ?

Regards.

A.

#proximity-sensor #vl6180x

[Nickname681_O]

Posted on June 24, 2014 at 19:18

The current consumption for the VL6180X is dependent on how it is used in the application.

The ranging measurement current consumption of the VL6180X in an application is dependent on the target distance, target reflectance, and sampling rate.  An application measuring a target at 50mm with a reflectance of 17% sampling at 10Hz will draw an average 1.7mA.  The average current consumption will be reduced to 0.17mA in the sample rate is reduced to 1Hz.

Mode

Current

Conditions

Hardware Standby

<1uA

Shutdown (GPIO0 = 0) No I2C

Software Standby

<1uA

After boot and device ready

ALS

300uA

During integration

Ranging

1.7mA1

Average consumption

1. 10Hz sampling rate, 17% reflective target at 50mm

In addition, the VL6180X has a feature to reduce the current consumption when there is no target.  The Early Convergence Estimate (ECE) will stop a measurement in 0.5ms if there is not enough returned signal.  This feature greatly reduces the current consumption.  The table below shows average current consumption under various conditions and show the effectiveness of the ECE.

Range Inter-measurement period(1)

Register setting

(0x001B)

Period

(ms)

ECE = 1.05

ECE = OFF

No Tgt

 (mA)

No Tgt (mA)

Tgt @ 50mm (mA)

Tgt @ 100mm (mA)

0xC8

2000

0.03

0.53

0.08

0.15

0x96

1500

0.04

0.72

0.11

0.2

0x64

1000

0.05

1.09

0.18

0.3

0x4B

750

0.07

1.42

0.22

0.4

0x32

500

0.09

2.19

0.33

0.59

0x19

250

0.18

4.20

0.62

1.42

0x0A

100

0.42

9.85

1.45

3.32

0x05

50

0.77

18.08

2.59

5.63

(1) Max Convergence time = 50ms

The ALS feature consumes an average of 300uA while integrating.  The table below shows average current consumption under various sampling and integration times.

Period

 

(ms)

Int 50

 

(mA)

Int 100

 

(mA)

Int 150

 

(mA)

Int 200

 

(mA)

2000

0.02

0.02

0.03

0.04

1500

0.02

0.03

0.04

0.05

1000

0.02

0.04

0.05

0.07

750

0.03

0.05

0.07

0.09

500

0.05

0.07

0.10

0.13

250

0.08

0.14

0.20

0.25

100

0.17

0.30

-

-

50

0.29

-

-

-