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NCN8025AMNGEVB Datasheet(PDF) 3 Page - ON Semiconductor |
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NCN8025AMNGEVB Datasheet(HTML) 3 Page - ON Semiconductor |
3 / 15 page NCN8025 / NCN8025A www.onsemi.com 3 VSEL1 VDDP 17 11 CVCC 24 12 1.8 V / 3 V / 5 V LDO VDD 18 CLKIN 19 25 GND 14 RSTIN 5 CIO 8 GND 10 CRST 9 CCLK 16 GND 4 PRES 3 Supply Voltage Monitoring Thermal Control Card Detection Control Logic and Fault Detection ISO7816 Sequencer 15 2 20 AUX1uc 7 CAUX1 21 6 AUX2uc CAUX2 1 VSEL0 Clock Divider 23 22 CLKDIV1 CLKDIV2 13 PORADJ Figure 4. NCN8025A Block Diagram (QFN−24 Pin Numbering) INT CMDVCC PRES I/Ouc PIN FUNCTION AND DESCRIPTION Pin (QFN24) Pin (QFN16) Name Type Description 1 1 VSEL0 Input Allows selecting card VCC power supply voltage mode (5V/3V or 1.8V/3V) VSEL0 = Low; CVCC = 5 V when VSEL1 = High or 3 V when VSEL1 = Low VSEL0 = High; CVCC = 1.8 V when VSEL1 = High or 3 V when VSEL1 = Low 2 2 VDDP Power Regulator power supply. 3 3 PRES Input Card presence pin active (card present) when PRES = Low. A built−in debounce timer of about 8 ms is activated when a card is inserted. Convenient for Normally Open (NO) Smart card connector. 4 − PRES Input Card presence pin active (card present) when PRES = High. A built−in debounce timer of about 8 ms is activated when a card is inserted. Convenient for Normally Closed (NC) smart card connector. 5 4 CI/O Input/ Output This pin handles the connection to the serial I/O (C7) of the card connector. A bi−directional level translator adapts the serial I/O signal between the card and the micro controller. A 11 k W (typical) pull up resistor to CVCC provides a High impedance state for the smart card I/O link. |
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