AN2556 Datasheet, PDF (5/35 Pages) STMicroelectronics – Porting an application from the ST10F269Zx to the ST10F273Z4

AN2556
1
Modified features
Modified features
1.1
Pinout
1.1.1
Table 1.
Pin
No.
17
56
99
143
144
Pinout modification summary
Table 1 below summarizes the modifications made in the pinout.
.
Pinout modifications table
ST10F269Zx
ST10F273Z4
Name
Function
Name
Function
DC2
DC1
EA
V_SS
V_DD
Internal voltage regulator decoupling.
Connect to nearest V_SS via a 330nF
capacitor.
V_DD 5V power supply pin
Internal voltage regulator decoupling.
Connect to nearest V_SS via a 330nF
capacitor.
Internal voltage regulator decoupling.
V₁₈ Connect to nearest V_SS via a 10 - 100nF
capacitor.
Selects code execution out of internal
Flash or external memory according
to level during reset
Selects code execution out of internal
EA-V_STBY
Flash or external memory according to
level during reset. Power supply input for
standby mode.
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.
5V power supply pin
XTAL4
Output of the 32 kHz oscillator amplifier
circuit. If not used should be left open to
avoid spurious consumption.
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 V_SS pin.
This is no longer the case in the ST10F273Z4 device where pin 17 is a V_DD pin.
Hardware impacts
PCB must be adapted.
Software impacts
None.
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