VM6101 Просмотр технического описания (PDF) - STMicroelectronics

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VM6101

I²C color light sensor

STMicroelectronics 

VM6101

Functional description

The light response can be approximated by:

● Y channel:

● R channel:

● G channel:

● B channel:

EvY = 1.58e6 x count -0.960

EvR = 3.34e6 x count -0.902

EvG = 4.92e6 x count -0.944

EvB = 8.03e6 x count -0.973

The response time is: t = count / fOSC + serial interface read time (about 200 µs)

Example:

t = 9.3 ms for 300 lx.

Each channel provides three status flags and a counter value:

● RESET: This flag is set upon reset or power-down resume. The counter value is invalid

and should be discarded. This flag is cleared after a status read operation.

● OVERFLOW: at least one counter overflow occurred: the counter value is invalid and

should be discarded. This flag is cleared when a new valid counter value is available.

● READY: a new counter value is available. This flag is cleared immediately after the

status register read.

● CNT: a 27-bit counter value, mapped in 4 consecutive bytes, MSB first and right

justified.

Channel readout must always start by reading the corresponding status register. The

suggested read operation is a 5-byte read operation starting at the status register address.

Refer to Chapter 4: Register description for details.

2.2

Comparator logic

This function compares the light level (i.e. channel counter CNT) with two programmable

thresholds (TH_LO and TH_HI) and drives the INT pin accordingly. The following table

shows available configurations using TH_CFG register setup:

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