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ST10F296 数据表(PDF) 99 Page - STMicroelectronics |
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ST10F296 数据表(HTML) 99 Page - STMicroelectronics |
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99 / 346 page  Obsolete Product(s) - Obsolete Product(s) ST10F296E External bus controller (EBC) 99/346 8.3 EA functionality The EA pin of the ST10F296E is shared with the VSTBY supply pin. When VDD main is on and stable, VSTBY can be temporarily grounded: The logic that in standby mode is powered by VSTBY (that is standby voltage regulator and 16 Kbyte portion of XRAM), is powered by VDD main. This allows the EA pin to be driven low during reset, as requested, to configure the system to start from the external memory. An appropriate external circuit must be provided to manage dynamically both functionalities associated with the EA pin. During reset and with stable VDD, the pin can be tied low, while after reset (or before turning off the main VDD to enter in standby mode) the VSTBY supply is applied. Figure 19 shows a diagram of a possible external circuit. Care should be taken when implementing the resistance for current limitation of bipolar. The resistance should not disturb standby mode when some current (in the order of hundreds of µA) is provided to the device by the VSTBY voltage supply source. The voltage at the EA pin of ST10F296E should not become lower than 4.5 V. To reduce the effect of current consumption transients on the VSTBY pin (refer to ISB3 in Section 24: Electrical characteristics) which may create voltage drops if a very low power external voltage regulator is used, it is suggested to add an external capacitance which can filter the eventual current peaks. Additional care must be paid to external hardware to limit the current peaks due to the presence of the capacitance (when EA functionality is used and the external bipolar is turned on, see Figure 19). Figure 19. EA/VSTBY external circuit VSTBY VSS 4 - 5.5 V EA function EA/VSTBY ST10F296 VSS Obsolete Product(s) - Obsolete Product(s) |
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