ncn6024 ON Semiconductor, ncn6024 Datasheet - Page 4

• Manufacturer Part Number: ncn6024
• Description: Compact And Low Cost Smart Card Interface Ic
• Manufacturer: ON Semiconductor

PIN FUNCTION AND DESCRIPTION
Pin #
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
CRD_AUX2
CRD_AUX1
CRD_GND
CRD_VCC
CRD_CLK
CRD_RST
CMDVCC
CRD_I/O
PORADJ
AUX1uc
AUX2uc
RSTIN
CLKIN
Name
I/Ouc
GND
VDD
INT
NC
Output
Output
Output
Output
Output
Output
Output
Output
Output
Power
Power
Input/
Input/
Input/
Input/
Input/
Input/
Type
GND
Input
Input
Input
GND
Input
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 13 kW (typical)
pullup resistor to CRD_VCC provides a High impedance state for the smart card I/O link.
This pin handles the connection to the chip card’s serial auxiliary AUX2 I/O pin (C8). A bi−directional
level translator adapts the serial I/O signal between the card and the micro controller. A 13 kW
(typical) pullup resistor to CRD_VCC provides a High impedance state for the smart card C8 pin.
This pin handles the connection to the chip card’s serial auxiliary AUX1 I/O pin (C4). A bi−directional
level translator adapts the serial I/O signal between the card and the micro controller. An 13 kW
(typical) pullup resistor to CRD_VCC provides a High impedance state for the smart card C4 pin.
Card Ground
This pin is connected to the CLOCK card connector’s pin (Chip card’s pin C3). The Clock signal
comes from the CLKIN input through clock dividers and level shifter.
This pin is connected to the chip card’s RESET pin (C2) through the card connector. A level
translator adapts the external Reset (RSTIN) signal to the smart card.
This pin is connected to the smart card power supply pin. An internal DC/DC converter is
programmable using the pin 5V/3V to supply either 5 V or 3 V output voltage. An external distributed
ceramic capacitor ranging from 320 nF to 500 nF recommended must be connected across
CRD_VCC and CRD_GND. This set of capacitor (if distributed) must be low ESR (< 100 mW).
Power−on reset threshold adjustment input pin for changing the reset threshold due to an external
resistor power divider. Needs to be connected to ground when unused.
Command VCC pin. Activation sequence Enable/Disable pin (active Low). The activation sequence is
enabled by toggling CMDVCC High to Low and when a card is present.
This Reset input connected to the host and referred to V
the smart card Reset pin through the internal level shifter which translates the level according to the
CRD_VCC programmed value.
This pin is connected to the system controller power supply. It configures the level shifter input
stage to accept the signals coming from the controller. A 0.1 mF capacitor shall be used to bypass
the power supply voltage. When V
Ground
The interrupt request is activated LOW on this pin. This is enabled when a card is present and the
card presence is detected by CRD_PRES or CRD_PRES pins. Similarly an interrupt is generated
when CRD_VCC is overloaded. 20 kW typical integrated pullup resistor to V
Clock Input for External Clock
Unconnected
This pin is connected to an external micro−controller. A bi−directional level translator adapts the
serial I/O signal between the smart card and the external controller. A built−in constant 13 kW
(typical) resistor provides a high impedance state.
This pin is connected to an external micro−controller. A bi−directional level translator adapts the
serial C4 signal between the smart card and the external controller. A built−in constant 13 kW
(typical) resistor provides a high impedance state.
This pin is connected to an external micro−controller. A bi−directional level translator adapts the
serial C8 signal between the smart card and the external controller. A built−in constant 13 kW
(typical) resistor provides a high impedance state.
http://onsemi.com
4
DD
is below 2.35 V typical the card pins are disabled.
Description
DD
(microcontroller side), is connected to
DD
.