TC9455N Toshiba Semiconductor, TC9455N Datasheet - Page 6

• Manufacturer Part Number: TC9455N
• Description: (TC9455 / TC9488) TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic
• Manufacturer: Toshiba Semiconductor

4. Electronic volume controllers
4.1
The IC incorporates microphone input 1 (MIC1) and microphone input 2 (MIC2) volume and echo volume
controllers. The built-in volume controller operates in 16 steps. Using an external variable resistor, volume
can be controlled by the DC level or from the MCU using serial data.
The TC9455F/N supports an I
Serial control timing
Figure 4 shows the serial control timing.
Table 1 lists bits used to set the volume.
M3, M2, M1, M0: Volume setting data
VOL1, 2, 3 setting
VOL1 setting
VOL2 setting
VOL3 setting
MODE
DA7
M3
M3
M3
M3
2
C bus interface; the TC9488F/N, a three-lead interface.
Figure 4 Serial control timing
Table 1 Volume setting bits
DA6
M2
M2
M2
M2
DA5
M1
M1
M1
M1
6
DA4
M0
M0
M0
M0
DA3
0
0
1
1
DA2
0
1
0
1
DA1
0
0
0
0
TC9455,88F/N
DA0
0
0
0
0
2002-02-05