Sound Processing - Daewoo DWP-28W2ZLF Service Manual

Appendix
Push-Pull
The push pull mode can be used for output only. Both sinking and sourcing is active, which leads to sleep
slopes. The levels are 0 and Vddp, the supply voltage 3.3Volts.
High impedance
This mode can be used for input only operation of the port.
Special port for LED
Pin 10 has the same functionality as the general I/O pins but in addition, their current source and sink
capacity is 8 mA instead of 4 mA. These pins are used for driving LED's via a series current limiting
resistor.
-Controller I/O pin configuration and function table
pin name
1 n.u.
2 SCL
3 SDA
4 SECAM L'
5 OCP
6 -
7 Key in
8 S/SW
10 Red/Green
LED
11 Panorama
62 Audio mute

2-5 Sound processing

Analogue sound IF - input section
The input pins ANA_IN1+ and ANA_IN- offer the possibility to connect sound IF sources to the MSP
3415D. The analogue-to-digital conversion of the preselected sound IF signal is done by an A/D converter,
whose output is used to control an analogue automatic gain circuit (AGC), providing an optimal level for a
wide range of input levels.
Quadrature Mixers
The digital input coming from the integrated A/D converter may contain audio information at a frequency
range of theoretically 0 to 9 MHz corresponding to the selected standards. By means of two
programmable quadrature mixers, two different audio sources ; for example, NICAM and FM-mono, may
be shifted into baseband position.
configuration
Stand by
High impedance
Open Drain
Open Drain
High impedance
High impedance
High impedance
High impedance
High impedance
High impedance
Push Pull
Push Pull
TV ON
High impedance
Open Drain
Open Drain
Push Pull
High impedance
High impedance
High impedance
See table above
Open Drain
Push Pull
Push Pull
- 28 -
Service manual WP-795
description
not used
Serial clock line
Serial data line
SIF filter swiching
Over Current Protection
( Switch the set OFF if
the voltage on this pin is
<2.33V )
For factory use only
Local keyboard input
external video switch
Panorama mode switch
High in stand by mode