参数资料
型号: ST72F651AR6T1
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, MICROCONTROLLER, PQFP64
封装: 10 X 10 MM, ROHS COMPLIANT, TQFP-64
文件页数: 150/161页
文件大小: 2656K
代理商: ST72F651AR6T1
ST72651AR6
89/161
Doc ID 7215 Rev 4
PWM/BRM GENERATOR (Cont’d)
PWM/BRM Outputs
The PWM/BRM outputs are assigned to dedicated
pins.
The PWM/BRM outputs can be connected to an
RC filter (see Figure 49 for an example).
The RC filter time must be higher than TCPUx64.
Figure 49. Typical PWM Output Filter
Table 29. 6-Bit PWM Ripple After Filtering
With RC filter (R=1K
Ω),
f
CPU = 8 MHz
V
DD = 5V
PWM Duty Cycle 50%
R=Rext
Note: after a reset these pins are tied low by de-
fault and are not in a high impedance state.
Figure 50. PWM Simplified Voltage Output After Filtering
Cext
OUTPUT
VOLTAGE
STAGE
OUTPUT
Rext
Cext (F)
V RIPPLE (mV)
0.128
78
1.28
7.8
12.8
0.78
V
DD
0V
DD
V
Vripple (mV)
V
OUTAVG
"CHARGE"
"DISCHARGE"
"CHARGE"
"DISCHARGE"
0V
V
0V
OUTAVG
V
(mV)
ripple
V
"CHARGE"
"DISCHARGE"
"CHARGE"
"DISCHARGE"
PWMOUT
DD
PWMOUT
OUTPUT
VOLTAGE
OUTPUT
VOLTAGE
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