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ST72774 데이터시트(PDF) 117 Page - STMicroelectronics

부품명 ST72774
상세설명  8-BIT USB MCU FOR MONITORS, WITH UP TO 60K OTP, 1K RAM, ADC, TIMER, SYNC, TMU, PWM/BRM, H/W DDC & I2C
PDF  144 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72774 데이터시트(HTML) 117 Page - STMicroelectronics

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PWM/BRM Outputs (Cont’d)
PWM/BRM Outputs
The PWM/BRM outputs are assigned to dedicated
pins.
The RC filter time must be higher than TCPUx64.
Figure 70. Typical PWM Output Filter
Table 27. 6-Bit PWM Ripple After Filtering
With RC filter (R=1K
Ω),
fCPU = 8 MHz
VDD = 5V
PWM Duty Cycle 50%
R=Rext.
Figure 71. PWM Simplified Voltage Output After Filtering
Cext
OUTPUT
VOLTAGE
STAGE
OUTPUT
Rext
Cext (µF)
V RIPPLE (mV)
0.128
78
1.28
7.8
12.8
0.78
V
DD
0V
0V
DD
V
Vripple (mV)
V
OUTAVG
"CHARGE"
"DISCHARGE"
"CHARGE"
"DISCHARGE"
0V
V
V
0V
OUTAVG
V
(mV)
ripple
V
VR01956
"CHARGE"
"DISCHARGE"
"CHARGE"
"DISCHARGE"
PWMOUT
DD
DD
PWMOUT
OUTPUT
VOLTAGE
OUTPUT
VOLTAGE



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