ST72T311 ST Microelectronics, ST72T311 Datasheet - Page 9

• Manufacturer Part Number: ST72T311
• Description: 8-BIT MCU WITH 8 TO 16K OTP/EPROM
• Manufacturer: ST Microelectronics

1.3 EXTERNAL CONNECTIONS
The following figure shows the recommended ex-
ternal connections for the device.
The V
and EPROM devices and must be tied to ground in
user mode.
The 10 nF and 0.1 F decoupling capacitors on
the power supply lines are a suggested EMC per-
formance/cost tradeoff.
Figure 6. Recommended External Connections
PP
pin is only used for programming OTP
Optional if Low Voltage
Detector (LVD) is used
EXTERNAL RESET CIRCUIT
V
DD
Or configure unused I/O ports
by software as input with pull-up
10nF
+
V
DD
0.1 F
0.1 F
See
A/D Converter
Section
V
DD
0.1 F
10K
See
Clocks
Section
4.7K
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.
V
V
V
V
RESET
V
Unused I/O
OSCOUT
OSCIN
PP
SS
DD
SSA
DDA
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