MB86434 Datasheet, PDF (7/38 Pages) Fujitsu Component Limited. – 5V Single Power Supply Audio Interface Unit (AIU)

MB86434
s FUNCTIONAL DESCRIPTION
1. Register Settings
The MB86434 IC chip controls all electronic volume, switching, tone generator circuits and power-down control
circuits by means of the SRD, STB and SRC data input signals.
The MB86434 uses a 9-bit serial data format consisting of a 4-bit address followed by 5 data bits. Data is picked
up at the rise of the SRC signal, and latched by the STB L-level signal. The 9-bits of serial data preceding the STB
signal are considered valid. These register settings are not reset at power-down. They can be reset when data is
initialized by an XPRST L-level signal.
(1) Mode Settings
Control
segment
EV0
EV1
EV2
TX-MUTE
RX-MUTE
SW4
SW3
SW8
SW6
SW9
SW7
ATT
Address Data bit
A3 A2 A1 A0 D4 D3 D2 D1 D0
0 0 0 1 D4 D3 D2 D1 D0
0 0 1 0 D4 D3 D2 D1 D0
0 0 1 1 * * D2 D1 D0
0 1 0 0 D4 * * * D0
0 1 0 1 D4 * D2 D1 D0
0 1 1 0 D4 * D2 D1 D0
Setting description
Sending audio level adjustment.
Adjusts EV0 gain.
Sending audio level adjustment.
Adjusts EV1 gain.
Sending audio level adjustment.
Adjusts EV2 gain.
D0: Sending audio mute SW 3, 4 on/off
control.
Mute: 1, Unmute: 0
D4: Receiving audio mute SW 6, 7, 8, 9
on/off control.
Mute: 1, Unmute: 0
D1: JMIC mute SW 4 on/off control.
Mute: 1, Unmute: 0
D2: MIC mute SW 3 on/off control.
Mute: 1, Unmute: 0
D4: RAUD mute SW 8 on/off control.
Mute: 1, Unmute: 0
D0: EAR, XEAR mute SW 6 on/off control.
Mute: 1, Unmute: 0
D1: TONE, XTONE mute SW 9 on/off
control.
Mute: 1, Unmute: 0
D2: JEAR mute SW 7 on/off control.
Mute: 1, Unmute: 0
D4: JEAR attenuation level switch.
0: 0.0 dB, 1: -6.0 dB.
Initial data bit
setting (at reset)
D4 D3 D2 D1 D0
01 1 11
01 1 11
* * 1 00
0* * * 0
0* 0 00
0* 0 00
Remarks
*1
*2, *3
*3, *4
*2
*3, *4, *5
*4
(Continued)
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