BH1751FVI
● Measurement sequence example from "Write instruction" to "Read measurement result"
ex1) Continuously H-resolution mode ( ADDR = 'L' )
Technical Note
from Master to Slave
① Send "Continuously H-resolution mode " instruction
from Slave to Master
ST
0100011
0
Ack
00010000
Ack
SP
② Wait to complete 1st H-resolution mode measurement.( max. 180ms. )
③ Read measurement result.
ST
0100011
1
Ack
High Byte [ 15:8 ]
Ack
Low Byte [ 7:0 ]
Ack
SP
How to calculate when the data High Byte is "10000011" and Low Byte is "10010000"
( 2 15 + 2 9 + 2 8 + 2 7 + 2 4 ) / 1.2 ≒ 28067 [ lx ]
The result of continuously measurement mode is updated.( 120ms.typ at H-resolution mode, 16ms.typ at L-resolution
mode )
ex2 ) One time L-resolution mode ( ADDR = 'H' )
① Send "One time L-resolution mode " instruction
ST
1011100
0
Ack
00100011
Ack
SP
② Wait to complete L-resolution mode measurement.( max. 24ms. )
③ Read measurement result
ST
1011100
1
Ack
High Byte [ 15:8 ]
Ack
Low Byte [ 7:0 ]
Ack
SP
( 2 + 2 ) / 1.2 ≒ 227 [ lx ]
How to calculate when the data High Byte is "00000001" and Low Byte is "00010000"
8 4
In one time measurement, Statement moves to power down mode after measurement completion.If updated result is need
then please resend measurement instruction.
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7/16
2011.11 - Rev.B
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