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ST7265X bảng dữ liệu(PDF) 93 Page - STMicroelectronics

tên linh kiện ST7265X
Giải thích chi tiết về linh kiện  LOW-POWER, FULL-SPEED USB 8-BIT MCU WITH 32K FLASH, 5K RAM, FLASH CARD I/F, TIMER, PWM, ADC, I2C, SPI
PDF  166 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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ST7265X bảng dữ liệu(HTML) 93 Page - STMicroelectronics

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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 53 for an example).
The RC filter time must be higher than TCPUx64.
Figure 53. Typical PWM Output Filter
Table 29. 6-Bit PWM Ripple After Filtering
With RC filter (R=1K
Ω),
fCPU = 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 54. 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
"CHARGE"
"DISCHARGE"
"CHARGE"
"DISCHARGE"
PWMOUT
DD
DD
PWMOUT
OUTPUT
VOLTAGE
OUTPUT
VOLTAGE



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