BD37068FV-M Datasheet, PDF (16/34 Pages) Rohm – AEC-Q100 Qualified

BD37068FV-M
Datasheet
(6) About power on reset
At on of supply voltage circuit made initialization inside IC is built-in. Please send data to all address as initial
data at supply voltage on. And please supply mute at set side until this initial data is sent.
Item
Rise time of VCC
VCC voltage of
release power on
reset
Limit
Symbol
Unit
Min Typ Max
Condition
Trise
33
－
－ usec VCC rise time from 0V to 5V
Vpor
－
4.1
－
V
(7) About start-up and power off sequence on IC
By setting the terminal HIVOLB is possible to change the output gain. At that time, depending on the mode the level
of the DC output bias is different.
HIVOLB terminal voltage
GND to 1.0V
2.3V to VCCL
Mode
High-Voltage ON
High-Voltage OFF
The terminal voltage on HIVOLB set in the condition in which they are defined. If you open a terminal HIVOLB is the
terminal voltage is set 5V which is a pull-up voltage inside the IC. In this case, set be "High-Voltage OFF" mode from the
above specifications.
The relationship between DC bias and set gain to the configuration of HIVOLB terminal follows in the table.
Operating supply
voltage
HIVOLB Terminal
Voltage
Regular DC bias
Output gain
VCCL=VCCH=8.5V
0V
7.5V
8.3dB
5V
4.15V
0dB
VCCL=8.5V / VCCH=17V
0V
8.35V
8.3dB
5V
4.15V
0dB
Please note that in case of on/off operation of HIVOLB terminal at steady state can generate variation corresponds to
difference of DC bias of the above table. To reduce the variation of these DC, power on after set the status of the HIVOLB
terminal according to the output gain asked for. Show the start-up and power off sequence as follows.
VCCL
VCCH
I2C LA01
External
MUTE
VCCH
VCCL
HIVOLB
I2C LA01
External
MUTE
Mode select = Hi-Voltage ON
power on
normal usage power off
power on
normal usage
power off
Normal mode operation (HIVOLB terminal = OPEN)
High-Voltage mode operation
Figure 14. Power off and start-up sequence in each mode
HIVOLB in the figure means the mode selector. I²C LA01 is to send data to address LA01 immediately after start-up, set the
active state of the IC. Therefore, this command must always send in start-up sequence. In addition, External MUTE means
recommended period that the muting outside IC.
About HIVOLB terminal, but measures have been made spike removal, please note that the IC may accept when receiving
input more than 50nsec.
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TSZ22111・15・001
16/31
TSZ02201-0C2C0E100130-1-2
13.MAR.2014 Rev.001