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ST8034HC Datasheet(PDF) 19 Page - STMicroelectronics |
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ST8034HC Datasheet(HTML) 19 Page - STMicroelectronics |
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19 / 31 page  DocID024511 Rev 2 19/31 ST8034HN, ST8034HC Functional description 6 Functional description Throughout this document it is assumed that the reader is familiar with ISO7816 terminology. 6.1 Power supplies All interface signals to the host microcontroller are referenced to VDD(INTF). All card contacts remain inactive during power-up or power-down. After powering up the device, OFF output remains low until CMDVCC input is set high and PRES input is low. During power-down, OFF output goes low when VDDP falls below the VDDP falling threshold voltage. The internal oscillator clock frequency fOSC(INT) is used only during the activation sequence. When the card is not activated (CMDVCC input is high), the internal oscillator is in low frequency mode to reduce power consumption. Power-on sequence: supply voltages may be applied to the ST8034 in any sequence. 6.2 Voltage supervisor Figure 6. Voltage supervisor, configured with adjustable VDD(INTF) threshold |
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