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ST72631 Datasheet(PDF) 9 Page - STMicroelectronics

Part # ST72631
Description  LOW SPEED USB 8-BIT MCU FAMILY with up to 16K MEMORY, up to 512 BYTES RAM, 8-BIT ADC, WDG, TIMER, SCI & I2C
PDF  109 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72631 Datasheet(HTML) 9 Page - STMicroelectronics

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1.3 EXTERNAL CONNECTIONS
The following figure shows the recommended ex-
ternal connections for the device.
The VPP pin is only used for programming OTP
and EPROM devices and must be tied to ground in
user mode.
The 10 nF and 0.1 µF decoupling capacitors on
the power supply lines are a suggested EMC per-
formance/cost tradeoff.
The external reset network is intended to protect
the device against parasitic resets, especially in
noisy environments.
Unused I/Os should be tied high to avoid any un-
necessary power consumption on floating lines.
An alternative solution is to program the unused
ports as inputs with pull-up.
Figure 4. Recommended External Connections
VPP
VDD
VSS
OSCIN
OSCOUT
RESET
VDD
0.1µF
+
See
Clocks
Section
VDD
0.1µF
0.1µF
EXTERNAL RESET CIRCUIT
Or configure unused I/O ports
Unused I/O
10nF
4.7K
10K
by software as input with pull-up
VDD
Detector (LVD) is used
Optional if Low Voltage



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