DS8023-KIT Maxim Integrated Products, DS8023-KIT Datasheet - Page 7

• Manufacturer Part Number: DS8023-KIT
• Description: EVALUATION KIT FOR DS8023
• Manufacturer: Maxim Integrated Products

Specifications of DS8023-KIT

• Main Purpose: Interface, Smart Card
• Utilized Ic / Part: DS8023
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 90-08023-KIT

The DS8023 is an analog front-end for communicating
with 1.8V, 3V, and 5V smart cards. Using an integrated
charge pump, the DS8023 can operate from a single
input voltage. The device translates all communication
lines to the correct voltage level and provides power for
smart card operation. It can operate from a wide input
voltage range (3.0V to 6.0V) and provides an extremely
low-power stop mode, consuming only 10nA while in
stop mode. The DS8023 is very compatible with the
NXP TDA8024. Many applications can upgrade with
very minor hardware changes, and only need to add
support in software to activate the ultra-low-power stop
Figure 1. Functional Diagram
Figure 2. Voltage Supervisor Behavior
CMDVCC
CLKDIV1
CLKDIV2
AUX1IN
AUX2IN
XTAL1
XTAL2
5V/3V
RSTIN
1_8V
I/OIN
GND
V
OFF
DD
(INTERNAL SIGNAL)
ALARM
POWER-SUPPLY
_______________________________________________________________________________________
SUPERVISOR
GENERATION
V
DD
CLOCK
Detailed Description
I/O TRANSCEIVER
SEQUENCER
CONTROL
DS8023
CARD VOLTAGE
CHARGE PUMP
TEMPERATURE
GENERATOR
MONITOR
AND
POWER ON
t
W
V
PGND
CP1
CP2
V
V
CGND
RST
CLK
PRES
I/O
AUX1
AUX2
PRES
DDA
UP
CC
mode. (Note that the PORADJ pin is not present in the
DS8023. It is replaced by the 1_8V selection pin.)
The DS8023 can operate from a single supply or a dual
supply. The supply pins for the device are V
V
range, and is the supply 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
reaches V
nal power-on reset pulse, t
is executed when V
An internal charge pump and regulator generate the
3V or 5V card supply voltage (V
and regulator are supplied by V
should be connected to a minimum 3.0V (maximum
6.0V) supply and should be at a potential that is equal
to or higher than V
The charge pump operates in a 1x (voltage follower) or
2x (voltage doubler) mode depending on the input
V
The voltage supervisor monitors the V
220µs reset pulse (t
device inactive during power on or power off of the V
supply. See Figure 2.
DDA
DDA
• For 5V cards, the DS8023 operates in a 1x mode
• For 3V cards, the DS8023 operates in a 1x mode
• For 1.8V cards, the DS8023 operates in a 1x mode
SUPPLY DROPOUT
Smart Card Interface
for V
for V
for V
, and PGND. V
and the selected card voltage (5V or 3V).
t
W
DDA
DDA
DDA
TH2
> 5.8V and in a 2x mode for V
> 4.1V and in a 2x mode for V
> 2.9V and in a 2x mode for V
+ V
HYS2
DD
DD
DD
.
W
falls below V
) is used internally to keep the
and for the duration of the inter-
Voltage Supervisor
should be in the 2.7V to 6.0V
W
. A deactivation sequence
CC
DDA
Power Supply
POWER OFF
). The charge pump
TH2
V
V
TH2
TH2
and PGND. V
.
+ V
HYS2
DD
DDA
DDA
DDA
supply. A
DD
< 5.8V.
< 4.1V.
< 2.9V.
, GND,
DDA
DD
DD
7