tc9470fn TOSHIBA Semiconductor CORPORATION, tc9470fn Datasheet - Page 12

• Manufacturer Part Number: tc9470fn
• Description: Modulation Da Converter With Built-in 8-times Oversampling Digital Filter/dynamic Digital Bass Boost/analog Filter
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Table 8 Serial Mode Control Settings
Serial Input Data
10.2 Serial Mode (
D12
D11
D10
D09
D08
D07
D06
D05
D04
D03
D02
D01
D00
mode.
signal rising edge. It is consequently necessary for the data input from the ATT pin on the shift signal
rising edge to be valid as indicated in the timing example in Figure 3. It is also necessary for the
LATCH pulse to rise at least .5 µs after the final clock rising edge input from the SHIFT pin.
Operating the shift clock with LATCH low destabilizes the internal state, which may lead to
malfunctions, so it must therefore be set to the low level after loading D7 to the register.
LATCH
SHIFT
Figure 13 Example of Data Setting Timing in the Serial Mode
It is possible to make the various settings with a microcontroller when in the serial mode.
Pins 8, 9 and 20 are used as the command input pins shown in the table below when in the serial
The LATCH signals and ATT signals are loaded to the LSI internal shift registers on the SHIFT
The various control settings when in the serial mode are shown in the table below.
Ensure that all control bits are set when the power supply is turned on.
ATT
MODE 1
AT11
AT10
AT09
AT08
AT07
AT06
AT05
AT04
AT03
AT02
AT01
AT00
A = 1.5 µs or higher, B = 1.5 µs or higher
Pin No.
0
D00
18
19
20
Control Signals
P/
S
Table 7 Pin Names at the Serial Mode
MODE 2
D01
MONO
DOFF
EMP
CHS
RLS
EFS
Š
Š
Š
Š
Š
= “L”: microcontroller setting mode)
1
0
Pin Name
LATCH
SHIFT
D02
ATT
MODE 3
BMUTE
DBB1
DBB2
DBB3
D03
TCA
TCR
Š
Š
Š
Š
Š
1
1
Shift clock signal input pin
Data latch signal input pin
Data input pin
D04
AT to AT00: Attenuation level setting
EMP: De-emphasis ON/OFF switch
MONO, CHS: Stereo/monaural switch
RLS: LRCK polarity switch
EFS: Dynamic circuit compression characteristics switch
DOFF: Dynamic circuit ON/OFF switch
DBB, DBB2: Digtal bass boost mode setting
DBB3: DBB MEGA max setting
BMUTE: Bass boost mute
TCA: Attack time switch
TCR: Recovery time switch
D05
12
D06
Pin Description
D07
D08
D09
D10
D11
D12
TC9470FN
2002-02-27