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ST72631K4

LOW SPEED USB 8-BIT MCU FAMILY with up to 16K MEMORY, up to 512 BYTES RAM, 8-BIT ADC, WDG, TIMER, SCI & I2C

STMicroelectronics 

ST7263

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

Optional if Low Voltage

Detector (LVD) is used

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

9/109

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