Posted on June 24, 2014 at 19:18The 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
- 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
-
-
-
