BH1750FVI(2009) Просмотр технического описания (PDF) - ROHM Semiconductor

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производитель

BH1750FVI
(Rev.:2009)

Ambient Light Sensor IC Series Digital 16bit Serial Output Type Ambient Light Sensor IC

ROHM Semiconductor 

BH1750FVI

Technical Note

●Instruction Set Architecture

Instruction

Power Down

Power On

Reset

Continuously H-Resolution Mode

Continuously H-Resolution Mode2

Continuously L-Resolution Mode

One Time H-Resolution Mode

One Time H-Resolution Mode2

One Time L-Resolution Mode

Change Measurement time

( High bit )

Change Masurement time

( Low bit )

※ Don't input the other opecode.

Opecode

Comments

0000_0000

0000_0001

0000_0111

0001_0000

0001_0001

0001_0011

0010_0000

0010_0001

0010_0011

01000_MT[7,6,5]

011_MT[4,3,2,1,0]

No active state.

Waiting for measurement command.

Reset Data register value. Reset command is not acceptable in

Power Down mode.

Start measurement at 1lx resolution.

Measurement Time is typically 120ms.

Start measurement at 0.5lx resolution.

Measurement Time is typically 120ms.

Start measurement at 4lx resolution.

Measurement Time is typically 16ms.

Start measurement at 1lx resolution.

Measurement Time is typically 120ms.

It is automatically set to Power Down mode after measurement.

Start measurement at 0.5lx resolution.

Measurement Time is typically 120ms.

It is automatically set to Power Down mode after measurement.

Start measurement at 4lx resolution.

Measurement Time is typically 16ms.

It is automatically set to Power Down mode after measurement.

Change measurement time.

※ Please refer "adjust measurement result for influence of optical window."

Change measurement time.

※ Please refer "adjust measurement result for influence of optical window."

●Measurement mode explanation

Measurement Mode

Measurement Time.

H-resolution Mode2

Typ. 120ms.

H-Resolution Mode

Typ. 120ms.

L-Resolution Mode

Typ. 16ms.

Resolurtion

0.5 lx

1 lx.

4 lx.

We recommend to use H-Resolution Mode.

Measurement time ( integration time ) of H-Resolution Mode is so long that some kind of noise( including in 50Hz / 60Hz

noise ) is rejected. And H-Resolution Mode is 1 l x resolution so that it is suitable for darkness ( less than 10 lx )

H-resolution mode2 is also suitable to detect for darkness.

●Explanation of Asynchronous reset and Reset command "0000_0111"

1) Asynchronous reset

All registers are reset. It is necessary on power supply sequence. Please refer "Timing chart for VCC and DVI power

supply sequence" in this page. It is power down mode during DVI = 'L'.

2) Reset command

Reset command is for only reset Illuminance data register. ( reset value is '0' ) It is not necessary even power supply

sequence.It is used for removing previous measurement result. This command is not working in power down mode, so

that please set the power on mode before input this command.

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© 2009 ROHM Co., Ltd. All rights reserved.

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2009.04- Rev.B

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