ST72651AR6 STMicroelectronics, ST72651AR6 Datasheet - Page 89

• Manufacturer Part Number: ST72651AR6
• Description: LOW-POWER, FULL-SPEED USB 8-BIT MCU WITH 32K FLASH, 5K RAM, FLASH CARD I/F, TIMER, PWM, ADC, I2C, SPI
• Manufacturer: STMicroelectronics

Specifications of ST72651AR6

• Dual Supply Management: analog voltage detector on the USB power line to enable smart power switching from USB power to battery (on E suffix devices).
• Programmable Internal Voltage Regulator For Memory Cards (2.8v To 3.5v) Supplying: Flash Card I/O lines (voltage shifting)
• 5 Usb Endpoints: 1 control endpoint
• Dtc (data Transfer Coprocessor): Universal Serial/Parallel communications interface, with software plug-ins for current and future protocol standards

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
The RC filter time must be higher than T
Figure 49. Typical PWM Output Filter
Figure 50. PWM Simplified Voltage Output After Filtering
OUTPUT
STAGE
VOLTAGE
VOLTAGE
PWMOUT
PWMOUT
OUTPUT
OUTPUT
V
V
V
V
0V
0V
0V
0V
DD
DD
DD
DD
"CHARGE"
Figure 49
"CHARGE"
for an example).
"DISCHARGE"
R
ext
"DISCHARGE"
CPU
OUTPUT
VOLTAGE
C
Doc ID 7215 Rev 4
ext
x64.
"CHARGE"
Table 29. 6-Bit PWM Ripple After Filtering
With RC filter (R=1KΩ),
f
V
PWM Duty Cycle 50%
R=R
Note: after a reset these pins are tied low by de-
fault and are not in a high impedance state.
CPU
DD
"CHARGE"
Cext (µF)
= 8 MHz
= 5V
ext
0.128
1.28
12.8
"DISCHARGE"
"DISCHARGE"
V RIPPLE (mV)
V
ripple
0.78
7.8
V ripple (mV)
78
ST72651AR6
(mV)
V
V
OUTAVG
OUTAVG
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