DS8113 Maxim, DS8113 Datasheet - Page 8

• Manufacturer Part Number: DS8113
• Description: The DS8113 smart card interface is a low-cost, analog front-end for a smart card reader, designed for all ISO 7816, EMV™, and GSM11-11 applications
• Manufacturer: Maxim

The DS8113 is an analog front-end for communicating
with 1.8V, 3V, and 5V smart cards. It is a dual input-
voltage device, requiring one supply to match that of a
host microcontroller and a separate +5V supply for
generating correct smart card supply voltages. The
DS8113 translates all communication lines to the cor-
rect voltage level and provides power for smart card
operation. It is a low-power device, consuming very lit-
tle current in active-mode operation (during a smart
card communication session), and is suitable for use in
Smart Card Interface
Figure 1. Functional Diagram
Figure 2. Voltage Supervisor Behavior
8
CMDVCC
CLKDIV1
CLKDIV2
_______________________________________________________________________________________
AUX1IN
AUX2IN
XTAL1
XTAL2
5V/3V
RSTIN
PRES
PRES
1_8V
I/OIN
GND
VDD
OFF
(INTERNAL SIGNAL)
ALARM
VDD
POWER-SUPPLY
SUPERVISOR
GENERATION
CLOCK
Detailed Description
I/O TRANSCEIVER
SEQUENCER
CONTROL
DS8113
CARD VOLTAGE
TEMPERATURE
GENERATOR
MONITOR
POWER ON
t
W
VDDA
PGND
CP1
CP2
VUP
VCC
CGND
RST
CLK
I/O
AUX1
AUX2
battery-powered devices such as laptops and PDAs,
consuming only 10nA in stop mode. See Figure 1 for a
functional diagram.
The DS8113 is a dual-supply device. The supply pins
for the device are VDD, GND, VDDA, and PGND. V
should be in the range of 2.7V to 6.0V, and is the sup-
ply for signals that interface with the host controller. It
should, therefore, be the same supply as used by the
host controller. All smart card contacts remain inactive
during power-on or power-off. The internal circuits are
kept in the reset state until V
and for the duration of the internal power-on reset
pulse, t
V
An internal regulator generates the 1.8V, 3V, or 5V card
supply voltage (V
separately by VDDA and PGND. VDDA should be con-
nected to a minimum 5.0V supply in order to provide
the correct supply voltage for 5V smart cards.
The voltage supervisor monitors the V
220µs reset pulse (t
device inactive during power-on or power-off of the
V
The DS8113 card interface remains inactive no matter
the levels on the command lines until duration t
V
When V
card deactivation sequence if its card interface is
active.
DD
DD
DD
falls below V
supply. See Figure 2.
SUPPLY DROPOUT
has reached a level higher than V
W
DD
. A deactivation sequence is executed when
t
W
falls below V
TH2
CC
). The regulator should be supplied
.
W
) is used internally to keep the
Voltage Supervisor
TH2
DD
, the DS8113 executes a
reaches V
Power Supply
POWER OFF
V
V
TH2
TH2
DD
TH2
+ V
TH2
HYS2
supply. A
+ V
+ V
W
HYS2
HYS2
after
DD
.