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AN2556 Datasheet(PDF) 5 Page - STMicroelectronics |
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AN2556 Datasheet(HTML) 5 Page - STMicroelectronics |
5 / 35 page 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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