BD37531FV-E2 ROHM [Rohm], BD37531FV-E2 Datasheet - Page 27

• Manufacturer Part Number: BD37531FV-E2
• Description: Sound Processors with Built-in 3-band Equalizer
• Manufacturer: ROHM [Rohm]

© 2010 ROHM Co., Ltd. All rights reserved.
BD37531FV,BD37532FV,BD37533FV,BD37534FV
www.rohm.com
About Level meter(available only BD37534FV)
（１） The operation of circuit
（２） The way to reset level meter output
（３） The settings about period of reset
Peak hold operation will start after HOLD data is transmitted. Set the WAIT time after HOLD data transmission
according to the frequency bandwidth detected.
WAIT time must be set to a minimum of one cycle over the detected frequency bandwidth.
Ex) Detected frequency bandwidth is above 40Hz, 『40Hz = 25ms = WAIT time』
Level meter is a function which gives DC voltage proportional to the size of signal of sound. It detects
the peak level of signal and keeps the peak level, so that it is possible to monitor the size of signal by
resetting DC voltage kept with suitable interval.
Please send reset data through I
When reset output of level meter：Send D6 = “ 1 “ of select address 02(hex).
When cancel of output reset of level meter (HOLD)… → Send D6 = “ 0 “ of select address 02(hex).
Transmission Example by I
LOUT [ V ]
I
2
CBUS
80
(RESET)
1
0
RESET
START
2
02
C BUS
40
2
C BUS
80
(HOLD)
HOLD
START
02
00
27/37
※fin＝40Hz
Wait time
(25msec)
detect
t
Technical Note
2010.03 - Rev.A