TDA8415 Просмотр технического описания (PDF) - Philips Electronics

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TDA8415

TV and VTR stereo/dual sound processor with integrated filters and I2C-bus control

Philips Electronics 

Philips Semiconductors

TV and VTR stereo/dual sound processor

with integrated filters and I2C-bus control

Preliminary specification

TDA8415

AF switch

The AF switch is used to switch to either the internal sound sources (E1* or E1* and E2*) or, to the external sound source

(E3 and E4) and is controlled via the I2C-bus.

Source selector

The source selector is used to connect the outputs from the AF switch to the outputs A1 to A4 as illustrated by Table 5.

The selector is controlled via the I2C-bus.

Muting

In this mode the AF outputs A1 to A4 are muted, and the identification circuit is deactivated (mono). The muting is active

after power-on reset or as a result of user control (via the mute input and bit CR3 of the control byte of the mute and port

control register; see Table 4).

Sound mute

If the switch register is set to (00) hex, (sound mute) only the AF outputs are muted, the identification circuit is still active

and can be read (status register) via the I2C-bus.

Power-on reset

The following actions are carried out by the internal power-on reset when it is active:

• The AF outputs are muted

• The identification circuit is deactivated (mono)

• The control ports (C1 and C2) are set LOW

• The I2C-bus transceiver is initialized

When the power-on reset becomes passive the following occurs:

• The AF outputs are kept in the mute state until the contents of the switch register are changed from (00) hex via the

I2C-bus

• The identification circuit is activated

• The control ports are LOW until the mute and control port register is changed (CR bits 10, 11, 20 and 21)

• The I2C-bus transceiver is activated

May 1989

6

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