BU26156RFS Datasheet, PDF (43/95 Pages) Rohm – Monoraul MIC Input with ALC

BU26156RFS
Datasheet
Mic Input Charging Time Register
MAPCON
INDEX
b07
b06
b05
b04
b03
b02
b01
b00
R
W
(Initial)
0x0
0x14 0x15
-
-
MCTIME
-
-
0
0
0
0
0
0
This register is to select the wait time for microphone input load charge. The LSI work recording signal are mute when from
RECPLAY is changed from 0x0 until MCTIME. This time contains required time of initializing internal circuit that is 40/fs. It
must be waited the setting time to start recording or playback.
In addition the wait time at starting playback is always 40/fs regardless of the setting value of this register.
MCTIME[5:0]
These bits are to set the wait time for Mic input charging time at starting recording. The wait time is available 40/fs and 128/fs
to 8064/fs every 128fs. According to following table, this time is proportional to sampling frequency (fs).
MCTIME[5:0]
fs equivalent
Time(fs=48kHz)
0x00
0x01
40/fs
128/fs
0.8ms
2.7ms
0x02
0x03
256/fs
384/fs
5.3ms
8.0ms
0x04 - 0x3D
0x3E
(128/fs / step)
7936/fs
:
165.3ms
0x3F
8064/fs
168.0ms
Note) the wait time for microphone input load charge
The wait time can be optionally to set with Mic Input Charging Time register. It is a recommended value of MIN1 couppling
capacitor at the charge time.
Charge time
Capacity of
Capacitor
Charge time (minimum)
0.1µF
0.22µF
16ms
36ms
* Charge time is proportional to Capacity of Capacitor.
MCTIME setting time (fs=48kHz)
0x09
0x14
Register MAP Control Register
MAPCON
INDEX
b07
b06
b05
b04
b03
b02
b01
b00
R
W
(Initial)
ALL 0x1c 0x1d
-
-
-
-
-
-
-
MAPCON(*)
-
-
-
-
-
-
-
0
MAPCON
The register is to set register map. Please refer register map about the map of the changing object.
MAPCON
Description
0
Register MAP0 access enable
1
Register MAP1 access enable
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TSZ02201-0V1V0E502570-1-2
Jul.1.2014 Rev.001