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NCN6001 Datasheet(PDF) 3 Page - ON Semiconductor |
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NCN6001 Datasheet(HTML) 3 Page - ON Semiconductor |
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3 / 34 page  NCN6001 http://onsemi.com 3 PIN FUNCTIONS AND DESCRIPTION Pin Name Type Description 1 I/O Input/Output Pullup This pin is connected to an external microcontroller interface. A bidirectional level translator adapts the serial I/O signal between the smart card and the microcontroller. The level translator is enabled when CS = L, the sub address has been selected and the system operates in the Asynchronous mode. When a Synchronous card is in use, this pin is disconnected and the data and the transaction take place with the MISO b3 register. The internal pullup resistor connected on the mC side is activated and visible by the selected chip only. 2 INT OUTPUT Pullup This pin is activated LOW when a card has been inserted and detected by CRD_DET pin. Similarly, an interrupt is generated when the CRD_VCC output is overloaded, or when the card has been extracted whatever be the transaction status (running or standby). The INT signal is reset to High according to Table 7 and Figure 11. On the other hand, the pin is forced to a logic High when the input voltage VCC drops below 2.0 V. 3 CLK_IN CLOCK INPUT High impedance The built−in Schmitt trigger receiver makes this pin suitable for a large type of clock signal (Figure 30). This pin can be connected to either the microcontroller master clock, or to a crystal signal, to drive the external smart cards. The signal is fed to the internal clock selector circuit and translated to the CRD_CLK pin at either the same frequency, or divided by 2 or 4, depending upon the programming mode. Note: The chip guarantees the EMV 50% Duty Cycle when the clock divider ratio is 1/2 or 1/4, even when the CLK_IN signal is out of the 45% to 55% range specified by ISO and EMV specifications. Care must be observed, at PCB level, to minimize the pick−up noise coming from the CLK_IN line. 4 MOSI INPUT Master Out Slave In: SPI Data Input from the external microcontroller. This byte contents the address of the selected chip among the four possible, together with the programming code for a given interface. 5 CLK_SPI INPUT Clock Signal to synchronize the SPI data transfer. The built−in Schmitt trigger receiver makes this pin compatible with a wide range of input clock signal (Figure 30). This clock is fully independent from the CLK_IN signal and does not play any role with the data transaction. 6 EN_RPU INPUT, Logic This pin is used to activate the I/O internal pullup resistor according to the here below true table: EN_RPU = Low → I/O Pullup resistor disconnected EN_RPU = High → I/O Pullup resistor connected When two or more NCN6001 chips shares the same I/O bus, one chip only shall have the internal pullup resistor enabled to avoid any overload of the I/O line. Moreover, when Asynchronous and Synchronous cards are handled by the interfaces, the activated I/O pullup resistor must preferably be the one associated with the Asynchronous circuit . On the other hand, since no internal pullup bias resistor is built in the chip, pin 6 must be connected to the right voltage level to make sure the logic function is satisfied. 7 MISO OUTPUT Master In Slave Out: SPI Data Output from the NCN6001. This byte carries the state of the interface, the serial transfer being achieved according to the programmed mode (Table 2), using the same CLK_SPI signal and during the same MOSI time frame. The three high bits [b7:b5] have no meaning and shall be discarded by the microcontroller. An external 4.7 k W Pull down resistor might be necessary to avoid misunderstanding of the pin 7 voltage during the High Z state. 8 CS INPUT This pin synchronizes the SPI communication and provides the chip address and selected functions. All the NCN6001 functions, both programming and card transaction, are disabled when CS = H. 9 VCC POWER This pin is connected to the NCN6001 supply voltage and must be bypassed to ground by a 10 mF/6.0 V capacitor. Since tantalum capacitors have relative high ESR, using low ESR ceramic type (MURATA X5R, Resr < 100 m W) is highly recommended. 10 Lout_H POWER The High Side of the external inductor is connected between this pin and Lout_L/pin 12 to provide the DC/DC function. The current flowing into this inductor is internally sensed and no external shunt resistor is used. Typically, Lout = 22 mH, with ESR < 2.0 W, yields a good efficiency performance for a maximum 65 mA DC output load. Note: The inductor shall be sized to handle the 450 mA peak current flowing during the DC/DC operation (see CoilCraft manufacturer data sheet). |
Similar Part No. - NCN6001_06 |
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Similar Description - NCN6001_06 |
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