Rohm BH1715FVC, Technical Notes

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● Measurement sequence example from "Write instruction" to "Read measurement result"
ex1) Continuously H-resolution mode ( ADDR = 'L' )
①
Send "Continuously H-resolution mode " instruction
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
How to calculate when the data High Byte is "00000001" and Low Byte is "00010000"
( 2
8
+ 2
4
) / 1.2 ≒ 227 [ lx ]
In one time measurement, Statement moves to power down mode after measurement completion. If updated result is
need then please resend measurement instruction.
from Master to Slave
from Slave to Master
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