Datasheet

Rev. 3.00, 03/04, page 260 of 830
9.4.1 PWM Setting Example
: Pulse added
1-conversion cycle
Combination of the basic pulse and added pulse outputs 0/256 to 255/256 of duty cycle as low ripple waveform.
Duty cycle
Basic
waveform
Additiona
pulse
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
127/256
128/256
129/256
130/256
PWDR
setting example
7F
80
81
82
112 pulse
128 pulse
128 pulse
128 pulse
15 pulse
0 pulse
1 pulse
2 pulse
Figure 9.3 Example of PWM Setting
9.4.2 Diagram of PWM Used as D/A Converter
Figure 9.4 shows the diagram example when using the PWM pulse as the D/A converter. Analog
signal with low ripple can be generated by connecting the low pass filter.
This LSI
Low pass filter Reference value
Resistor : 120 kΩ
Capacitor : 0.1 µF
Figure 9.4 Example when PWM is Used as D/A Converter