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ST72T251G2B3 View Datasheet(PDF) - STMicroelectronics

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ST72T251G2B3 Datasheet PDF : 100 Pages
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ST72251
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.
Figure 4. Recommended External Connections
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.
VDD
+
10nF
0.1µF
VPP
VDD
VSS
EXTERNAL RESET CIRCUIT
VDD
0.1µF
0.1µF
4.7K
RESET
See
Clocks
Section
OSCIN
OSCOUT
Or configure unused I/O ports
by software as input with pull-up
10K
VDD
Unused I/O
8/100
7

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