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ST7265X Scheda tecnica(PDF) 93 Page - STMicroelectronics

Il numero della parte ST7265X
Spiegazioni elettronici  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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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST7265X Scheda tecnica(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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