Daewoo DWP-28W2ZLF - Manual (Page 55)

Appendix Service manual WP-795
- 28 -
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.
µ
-Controller I/O pin configuration and function table
configuration
pin name
Stand by TV ON
description
1 n.u. High impedance High impedance not used
2 SCL Open Drain Open Drain Serial clock line
3 SDA Open Drain Open Drain Serial data line
4 SECAM L’ High impedance Push Pull SIF filter swiching
5 OCP High impedance High impedance Over Current Protection
( Switch the set OFF if
the voltage on this pin is
<2.33V )
6 - High impedance High impedance For factory use only
7 Key in High impedance High impedance Local keyboard input
8 S/SW High impedance See table above external video switch
10 Red/Green
LED
High impedance Open Drain
11 Panorama Push Pull Push Pull Panorama mode switch
62 Audio mute Push Pull Push Pull High in stand by mode
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.