ST72E121 datasheet(7/92 Pages) STMICROELECTRONICS

Part #	ST72E121

Description	8-BIT MCU WITH 8 TO 16K OTP/EPROM, 384 TO 512 BYTES RAM, WDG, SCI, SPI AND 2 TIMERS

PDF	92 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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7 / 92 page

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ST72E121 ST72T121

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

0.1

µF

See

Clocks

Section

VDD

0.1

µF

0.1

µF

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

ST72E121 Datasheet(PDF) 7 Page - STMicroelectronics

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