Daewoo DWP-28W2ZZF Service Manual download pdf (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.

-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.

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Daewoo DWP-28W2ZZF Service Manual Page 55

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