NCN8025A ONSEMI [ON Semiconductor], NCN8025A Datasheet - Page 3

• Manufacturer Part Number: NCN8025A
• Description: Compact SMART CARD Interface IC
• Manufacturer: ONSEMI [ON Semiconductor]

PIN FUNCTION AND DESCRIPTION
(QFN24)
Pin
1
2
3
4
5
(QFN16)
Pin
1
2
3
−
4
CMDVCC
CLKDIV1
CLKDIV2
PORADJ
AUX1uc
AUX2uc
VSEL0
VSEL1
RSTIN
CLKIN
VDDP
I/Ouc
GND
GND
VSEL0
Name
VDDP
PRES
PRES
INT
CI/O
Figure 4. NCN8025A Block Diagram (QFN−24 Pin Numbering)
16
13
24
12
17
22
23
18
14
19
20
21
25
2
1
Output
Power
Input/
Type
Input
Input
Input
Clock Divider
Fault Detection
Control Logic
Allows selecting card V
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
Regulator power supply.
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.
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.
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 kW (typical) pull up resistor to CVCC provides a High impedance state for
the smart card I/O link.
and
Supply Voltage
Monitoring
VDD
http://onsemi.com
15
1.8 V / 3 V / 5 V LDO
3
Sequencer
CC
ISO7816
power supply voltage mode (5V/3V or 1.8V/3V)
Thermal
Control
Description
Detection
Card
11
10
3
4
9
5
7
6
8
CVCC
PRES
PRES
CCLK
CRST
CIO
CAUX1
CAUX2
GND