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AN2556 Datasheet(PDF) 5 Page - STMicroelectronics

Part # AN2556
Description  Porting an application from the ST10F269Zx to the ST10F273Z4
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2556 Datasheet(HTML) 5 Page - STMicroelectronics

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AN2556
Modified features
5/35
1
Modified features
1.1
Pinout
1.1.1
Pinout modification summary
Table 1 below summarizes the modifications made in the pinout.
.
1.1.2
Pin 17
In the ST10F269Zx, a decoupling capacitor of 330nF minimum has to be connected
between pin 17 (named DC2) and the nearest VSS pin.
This is no longer the case in the ST10F273Z4 device where pin 17 is a VDD pin.
Hardware impacts
PCB must be adapted.
Software impacts
None.
Table 1.
Pinout modifications table
Pin
No.
ST10F269Zx
ST10F273Z4
Name
Function
Name
Function
17
DC2
Internal voltage regulator decoupling.
Connect to nearest VSS via a 330nF
capacitor.
VDD
5V power supply pin
56
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.
99
EA
Selects code execution out of internal
Flash or external memory according
to level during reset
EA-VSTBY
Selects code execution out of internal
Flash 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. If not used should be tied to
ground to avoid consumption. In addition,
bit OFF32 in RTCCON register should be
set.
144
VDD
5V power supply pin
XTAL4
Output of the 32 kHz oscillator amplifier
circuit. If not used should be left open to
avoid spurious consumption.


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