ST2202 datasheet(39/65 Pages) ETC

39 / 65 page

Sitronix

ST2202

Ver 2.0a

39/65

2003-May-05

15.2.3 Two-Pin Push Pull Mode (8-bit Accuracy)

Two-Pin Push Pull mode is designed for buzzer. It requires

two pin that PSG0 and PSG1. When the DAC value is 0,

both pins are low. When the DAC value is positive, PSG1

goes high with a duty cycle proportional to the output

value, while PSG0 stays low. When the DAC value is

negative, PSG0 goes high with a duty cycle proportional

to the output value, while PSG1 stays low. This mode offers

a resolution of 8 bits.

Figure 13-7 shows examples of DAC output waveforms with

different output values. Each pulse of the DAC is divided

into 128 segments per sample period. For a positive output

value x=0 to 127, PSG1 goes high for X segments while

PSG0 stays low. For a negative output value x=0 to -127,

PSG0 goes high for |X| segments while PSG1 stays low.

FIGURE 15-5 Two-Pin Push Pull Mode Wave Form

High

Low

PSG0

DAC = X

Where X=0 to 127

DAC = 96

High

Low

PSG1

128-X

DAC = 32

DAC = 127

127

High

Low

PSG0

DAC = X

Where X=0 to -128

DAC = 0

High

Low

PSG1

|X|

128+X

DAC = -48

DAC = -128

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