VL6180X datasheet(24/79 Pages) STMICROELECTRONICS

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Functional description

VL6180X

24/79

DocID026171 Rev 6

The buffer is read via eight 16-bit registers (RESULT__HISTORY_BUFFER_0{0x52} to

RESULT__HISTORY_BUFFER_7{0x60})

. The buffer holds the last 16 x 8-bit range or 8 x

16-bit ALS results as shown in Table 9.

Note:

Only one data stream (ALS or range) can be buffered at one time. There is no associated

time stamp information.

The clear buffer command is not immediate; it takes effect on the next range or ALS start

command.

The history buffer works independently of interrupt control i.e. the history buffer records all

new samples; its operation is unchanged in threshold and window modes.

2.11

Current consumption

Table 10. gives an overview of current consumption in different operating states.

2.11.1

Ranging current consumption

Figure 14. shows typical ranging current consumption of the VL6180X. Current consumption

depends on target distance, target reflectance and sampling rate. The example shown here

is based on default settings and a sampling rate of 10 Hz. The average current consumption

for a 17% reflective target at 50 mm operating at 10 Hz is 1.7 mA. At different sampling rates

Table 9. History buffer

History buffer

Range

ALS

(High byte)

(Low byte)

(Word)

Range [15] (newest)

Range [14]

ALS [7] (newest)

Range [13]

Range [12]

ALS [6]

Range [11]

Range [10]

ALS [5]

Range [9]

Range [8]

ALS [4]

Range [7]

Range [6]

ALS [3]

Range [5]

Range [4]

ALS [2]

Range [3]

Range [2

ALS [1]

Range [1]

Range [0] (oldest)

ALS [0] (oldest)

Table 10. Typical current consumption in different operating states

Mode

Current

Conditions

Hardware standby

< 1

μA

Shutdown (GPIO0 = 0). No I2C comms

Software standby

< 1

μA

After MCU boot. Device ready

ALS

300

μA

During integration

Ranging

1.7 mA

Average consumption during ranging(1)

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

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