st2032a Sitronix Technology Corporation, st2032a Datasheet - Page 30

• Manufacturer Part Number: st2032a
• Description: 8 Bit Microcontroller With 32k Bytes Rom
• Manufacturer: Sitronix Technology Corporation

14.3 PWM DAC Mode Options
The PWM DAC generator has three modes, Single-pin
mode, Two-pin two-ended mode and Two-pin push pull
14.3.1 Single-Pin Mode (7-bit Accuracy)
Single-pin mode is designed for use with a single-transistor
amplifier. It has 7 bits of resolution. The duty cycle of the
PSGO is proportional to the output value. If the output value
is 0, the duty cycle is 50%. As the output value increases
from 0 to 63, the duty cycle goes from being high 50% of
Ver 2.4
PSGO
High
Low
DAC = 0
64
FIGURE 14-4 Single-Pin Mode Application Circuit
64
FIGURE 14-3 Single-Pin Mode Wave Form
DAC = 32
96
30/54
mode. They are depended on the application used. The
DAC mode is controlled by DMD[1~0]. (TABLE 13-3)
the time up to 100% high. As the value goes from 0 to -64,
the duty cycle decreases from 50% high to 0%. PSGOB is
inverse of PSGO’ s waveform. Figure 13-3 shows the PSGO
waveforms.
32
32
DAC = -32
96
64+X
DAC = X
64-X
ST2032A
9/13/07