AN2555 datasheet(3/33 Pages) STMICROELECTRONICS

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AN2555 - Application note

Modified features

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Modified features

1.1

Pinout

1.1.1

Pinout modification summary

Table 1 summarizes the modifications made in the pinout.

1.1.2

Pin 17

On the ST10F269Zx, a decoupling capacitor of 330nF minimum has to be connected between the pin 17

(named DC2) and the nearest V

SS pin.

This is no longer the case for the ST10F276Z5 device where pin 17 is a VDD pin.

Hardware impact

PCB must be adapted.

Software impact

None.

Table 1.

Pinout modifications

Pin number

ST10F269Zx name and function

ST10F276Z5 name and function

DC: Internal voltage regulator decoupling.

Connect to nearest VSS via a 330 nF

capacitor.

VDD: 5 V power supply pin

DC1: Internal voltage regulator

decoupling. Connect to nearest VSS via a

330nF capacitor.

V18: Internal voltage regulator

decoupling. Connect to nearest VSS via a

10-100nF capacitor.

EA: Selects code execution out of internal

Flash memory or external memory

according to level during reset.

EA-VSTBY: Selects code execution out of

internal Flash memory or external

memory according to level during reset.

Power supply input for standby mode.

143

VSS: Ground pin

XTAL3: Input to the 32 kHz oscillator

amplifier circuit. When not used shall be

tied to ground to avoid consumption.

Besides, bit OFF32 in RTCCON register

must be set.

144

VDD: 5V power supply pin

XTAL4: Output of the 32 kHz oscillator

amplifier circuit. When not used must be

left open to avoid spurious consumption.

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