TC9470FN Datasheet, PDF(12/19 Page) Toshiba Semiconductor – Modulation DA Converter with Built-in 8-Times Oversampling Digital Filter/Dynamic Digital Bass Boost/Analog Filter

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TC9470FN Datasheet, PDF (12/19 Pages) Toshiba Semiconductor – Modulation DA Converter with Built-in 8-Times Oversampling Digital Filter/Dynamic Digital Bass Boost/Analog Filter

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TC9470FN

10.2

Serial Mode ( P/S = âLâ: microcontroller setting mode)

It is possible to make the various settings with a microcontroller when in the serial mode.

Pins 18, 19 and 20 are used as the command input pins shown in the table below when in the serial

mode.

Table 7 Pin Names at the Serial Mode

Pin No.

Pin Name

Pin Description

LATCH

SHIFT

ATT

Data latch signal input pin

Shift clock signal input pin

Data input pin

The LATCH signals and ATT signals are loaded to the LSI internal shift registers on the SHIFT

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 13. It is also necessary for the

LATCH pulse to rise at least 1.5 Âµs 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

ATT

D00 D01 D02 D03 D04 D05 D06 D07 D08 D09 D10 D11 D12

A = 1.5 Âµs or higher, B = 1.5 Âµs or higher

Figure 13 Example of Data Setting Timing in the Serial Mode

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.

Table 8 Serial Mode Control Settings

Serial Input Data

D12

D11

D10

D09

D08

D07

D06

D05

D04

D03

D02

D01

Control Signals

MODE 1 MODE 2 MODE 3

AT11

AT10

EMP

DBB1

AT09

MONO

DBB2

AT08

CHS

DBB3

AT07

RLS

BMUTE

AT06

EFS

TCA

AT05

DOFF

TCR

AT04

AT03

AT02

AT01

D00

AT00

AT11 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

DBB1, DBB2: Digtal bass boost mode setting

DBB3: DBB MEGA max setting

BMUTE: Bass boost mute

TCA: Attack time switch

TCR: Recovery time switch

2002-02-27

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