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ST8024L 数据表(PDF) 26 Page - STMicroelectronics |
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ST8024L 数据表(HTML) 26 Page - STMicroelectronics |
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26 / 35 page  Functional description ST8024L 26/35 Doc ID 17709 Rev 5 Figure 9. Emergency deactivation sequence (card extraction) 6.11 VCC selection settings The ST8024L supports three smartcard VCC voltages: 1.8 V, 3 V, and 5 V. The VCC selection is controlled by the 1.8V and 5V/3V signals as shown in Table 23. The 1.8V signal has priority over the 5V/3V. When the 1.8 V pin is taken high, VCC is 1.8 V and it overrides any setting on the 5V/3V pin. When the 1.8V pin is taken low, the 5V/3V pin selects the 5 V or 3 V VCC. If the 5V/3V pin is taken high, then VCC is 5 V, and if the 5V/3V pin is taken low then VCC is 3 V. Table 23. VCC selection settings 5V/3V pin 1.8V pin VCC output 00 3 V 10 5 V x1 1.8 V |
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