DS8023 Maxim, DS8023 Datasheet - Page 6

• Manufacturer Part Number: DS8023
• Description: The DS8023 smart card interface IC is a low-cost, low-power, analog front-end for a smart card reader designed for all ISO 7816, EMV*, and GSM11-11 applications
• Manufacturer: Maxim

Smart Card Interface
6
12, 13
24, 25
27, 28
_______________________________________________________________________________________
PIN
1, 2
5, 7
10
11
14
15
16
17
18
19
20
21
22
23
26
3
4
6
8
9
CLKDIV1,
CP2, CP1
CMDVCC
CLKDIV2
AUX1IN,
AUX2IN
XTAL1,
NAME
AUX2,
CGND
XTAL2
PGND
RSTIN
5V/3V
AUX1
PRES
PRES
V
I/OIN
1_8V
GND
CLK
RST
V
V
OFF
V
I/O
DDA
UP
CC
DD
Clock Divider. Determines the divided-down input clock frequency (presented at XTAL1 or from a
crystal at XTAL1 and XTAL2) on the CLK output pin. Dividers of 1, 2, 4, and 8 are available.
5V/3V Selection Pin. Allows selection of 5V or 3V for communication with an IC card. Logic-high
selects 5V operation; logic-low selects 3V operation. See Table 3 for a complete description of
choosing card voltages.
Analog Ground
Step-Up Converter Contact. Charge-pump capacitor. Connect a 100nF capacitor (ESR < 100m )
between CP1 and CP2.
Charge-Pump Supply. Must be equal to or higher than V
Charge-Pump Output. Connect a 100nF capacitor (ESR < 100m ) between V
Card Presence Indicator. Active-low card presence inputs. When the presence indicator becomes
active, a debounce timeout begins. After 8ms (typ) the OFF signal becomes active.
Card Presence Indicator. Active-high card presence inputs. When the presence indicator becomes
active, a debounce timeout begins. After 8ms (typ) the OFF signal becomes active.
Smart Card Data-Line Output. Card data communication line, contact C7.
Smart Card Auxiliary Line (C4, C8) Output. Data line connected to card reader contacts C4 (AUX1)
and C8 (AUX2).
Smart Card Ground
Smart Card Clock. Card clock, contact C3.
Smart Card Reset. Card reset output from contact C2.
Smart Card Supply Voltage. Decouple to CGND (card ground) with 2 x 100nF or 100 + 220nF
capacitors (ESR < 100m ).
1.8V Operation Selection. Active-high selection for 1.8V smart card communication. An active-high
signal on this pin overrides any setting on the 5V/3V pin.
Activation Sequence Initiate. Active-low input from host.
Card Reset Input. Reset input from the host.
Supply Voltage
Digital Ground
Status Output. Active-low interrupt output to the host. Use a 20k
Crystal/Clock Input. Connect an input from an external clock to XTAL1 or connect a crystal across
XTAL1 and XTAL2. For the low idle-mode current variant, an external clock must be driven on
XTAL1.
I/O Input. Host-to-interface chip data I/O line.
C4/C8 Input. Host-to-interface I/O line for auxiliary connections to C4 and C8.
FUNCTION
DD
. Connect a supply of at least 3.0V.
integrated pullup resistor to V
Pin Description
UP
and GND.
DD
.