ncn8024 ON Semiconductor, ncn8024 Datasheet - Page 3

• Manufacturer Part Number: ncn8024
• Description: Ncn8024 Smart Card Interface Ic
• Manufacturer: ON Semiconductor

PIN FUNCTION AND DESCRIPTION
CLKDIV1
CLKDIV2
CMDVCC
PORADJ
AUX2uc
AUX1uc
Pin #
RSTIN
CLKIN
10
1
2
3
4
5
6
7
8
9
5V/3V
I/Ouc
GND
NC
INT
CRD_PRES
CRD_PRES
23
19
18
24
25
20
26
27
28
22
CLKDIV1
CLKDIV2
3
1
2
GNDP
Name
5V/3V
VDDP
VUP
C2
C1
Clock Dividers
Power
Power
Power
Power
Type
Input
Input
Input
GND
Input
Input
VDD
21
Supply Voltage
This pin coupled with CLKDIV2 is used to program the clock frequency division ratio (Table 1).
This pin coupled with CLKDIV1 is used to program the clock frequency division ratio (Table 1).
Allows selecting card V
5V/3V = LOW
DC/DC Converter Power Supply Ground
DC/DC Converter Capacitor pin number 2 − A 100 nF capacitor is connected between this pin and
pin C1. The capacitor has to feature an ESR lower than 100 mW
DC/DC Converter Power Supply Voltage
DC/DC Converter Capacitor pin number 1 − A 100 nF capacitor is connected between this pin and
pin C2. The capacitor has to feature an ESR lower than 100 mW
Charge−pump output − a very low ESR 100 nF capacitor (ESR< 100 mW) is connected between
this pin and GNDP
Card presence pin active (card present) when CRD_PRES = Low. A built−in debounce timer of
about 8 ms is activated when a card is inserted.
Card presence pin active (card present) when CRD_PRES = High. A built−in debounce timer of
about 8 ms is activated when a card is inserted.
Monitoring
Interrupt Block
Figure 3. NCN8024 Block Diagram
and Sequencer
Control Logic
http://onsemi.com
CC
power supply voltage. CRD_V
3
Thermal Control
Internal Oscillator 2.5 MHz
VDDP
6
Description
DC/DC Converter
Card Pin
Drivers
Card Detection
CC
= 5 V when 5V/3V = HIGH or 3 V when
10
17
15
16
11
13
12
14
9
5
7
4
8
CRD_PRES
CRD_PRES
C2
C1
CRD_VCC
GNDP
VUP
CRD_CLK
CRD_RST
CRD_I/O
CRD_AUX2
CRD_AUX1
CRD_GND