Datasheet

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19-6380; Rev 1; 4/13

DS8023

Smart Card Interface

For pricing, delivery, and ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.

General 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. The

DS8023 supports 5V, 3V, and 1.8V smart cards, and pro-

vides an option for ultra-low stop-mode power consump-

tion. The DS8023 is available in 28-pin TSSOP and SO

packages, and can often be used as a replacement for

the TDA8024 with little or no application changes.

The DS8023 is designed to interface between a system

microcontroller and the smart card interface, providing

all power supply, protection, and level shifting required

for IC card applications.

Applications

Set-Top Box Conditional Access

Access Control

Banking Applications

POS Terminals

Debit/Credit Payment Terminals

PIN Pads

Automated Teller Machines

Telecommunications

Pay/Premium Television

Features

o Analog Interface and Level Shifting for IC Card

Communication

o ±8kV (min) ESD (IEC) Protection on Card Interface

Pins

o Ultra-Low Stop-Mode Current, Less Than 10nA (typ)

o Internal IC Card-Supply Voltage Generation

5.0V ±5%, 80mA (max)

3.0V ±8%, 65mA (max)

1.8V ±10%, 30mA (max)

o Automatic Card Activation and Deactivation

Controlled by Dedicated Internal Sequencer

o I/O Lines from Host Directly Level Shifted for

Smart Card Communication

o Flexible Card Clock Generation, Supporting

External Crystal Frequency Divided by 1, 2, 4, or 8

o High-Current/Short-Circuit and High-Temperature

Protection

Ordering Information

Note: Contact the factory for availability of other variants and

package options.

Denotes a lead(Pb)-free/RoHS-compliant package.

EMV is a trademark owned by EMVCo LLC. EMV Level 1 library and hardware reference design available. Contact factory for details.

Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device may be

simultaneously available through various sales channels. For information about device errata, go to: www.maximintegrated.com/errata

PART TEMP RANGE PIN-PACKAGE

DS8023-RJX+ -40°C to +85°C 28 TSSOP

DS8023-RRX+ -40°C to +85°C 28 SO

Selector Guide appears at end of data sheet.

PGND

AUX2IN

AUX1IN

I/OIN

XTAL2

TOP VIEW

DS8023

XTAL1

OFF

GND

21 V

20 RSTIN

19 CMDVCC

18 1_8V

17 V

16 RST

15 CLK

5V/3V

CLKDIV2

CLKDIV1

CP1

DDA

PRES

I/O

AUX2

AUX1

14CGND

CP2

SO/TSSOP

Pin Configuration

Summary of content (17 pages)

PAGE 1
DS8023 Smart Card Interface General Description The DS8023 smart card interface IC is a low-cost, lowpower, analog front-end for a smart card reader designed for all ISO 7816, EMV*, and GSM11-11 applications. The DS8023 supports 5V, 3V, and 1.8V smart cards, and provides an option for ultra-low stop-mode power consumption. The DS8023 is available in 28-pin TSSOP and SO packages, and can often be used as a replacement for the TDA8024 with little or no application changes.
PAGE 2
DS8023 Smart Card Interface ABSOLUTE MAXIMUM RATINGS Voltage Range on VDD Relative to GND ...............-0.5V to +6.5V Voltage Range on VDDA Relative to PGND ...........-0.5V to +6.5V Voltage Range on CP1, CP2, and VUP Relative to PGND...............................................-0.5V to +7.5V Voltage Range on All Other Pins Relative to GND......................................-0.5V to (VDD + 0.5V) Maximum Junction Temperature .....................................
PAGE 3
DS8023 Smart Card Interface RECOMMENDED DC OPERATING CONDITIONS (continued) (VDD = +3.3V, VDDA = +5.0V, TA = +25°C, unless otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS SHUTDOWN TEMPERATURE Shutdown Temperature T SD +150 °C RST PIN Card-Inactive Mode Card-Active Mode Output Low Voltage VOL_RST1 I OL_RST = 1mA 0 0.3 V Output Current I OL_RST1 VO_LRST = 0V 0 -1 mA Output Low Voltage VOL_RST2 I OL_RST = 200μA 0 0.
PAGE 4
DS8023 Smart Card Interface RECOMMENDED DC OPERATING CONDITIONS (continued) (VDD = +3.3V, VDDA = +5.0V, TA = +25°C, unless otherwise noted.) (Note 1) PARAMETER Output Current SYMBOL ICC2 Card-Active Mode Shutdown Current Threshold ICC(SD) Slew Rate VCCSR CONDITIONS MIN TYP MAX VCC(5V) = 0 to 5V -80 VCC(3V) = 0 to 3V -65 VCC(1.8V) = 0 to 1.8V -30 120 Up/down, C < 300nF (Note 5) 0.05 0.16 UNITS mA mA 0.
PAGE 5
DS8023 Smart Card Interface RECOMMENDED DC OPERATING CONDITIONS (continued) (VDD = +3.3V, VDDA = +5.0V, TA = +25°C, unless otherwise noted.) (Note 1) PARAMETER SYMBOL Input Low Current I IL_IO Input High Current I IH_IO t IT Input Rise/Fall Time CONDITIONS MIN TYP MAX UNITS 600 μA VIH = VDD 10 μA VIL to VIH 1.2 μs 15 k VIL = 0V Integrated Pullup Resistor RPU Pullup to VDD 7 Current When Pullup Active I PU CL = 30pF, V OH = 0.
PAGE 6
DS8023 Smart Card Interface Pin Description 6 PIN NAME FUNCTION 1, 2 CLKDIV1, CLKDIV2 3 5V/3V 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. 4 PGND Analog Ground 5, 7 CP2, CP1 6 VDDA 8 VUP 9 PRES Card Presence Indicator. Active-low card presence inputs.
PAGE 7
DS8023 Smart Card Interface Detailed Description 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.
PAGE 8
DS8023 Smart Card Interface The DS8023 card interface remains inactive no matter the levels on the command lines until duration tW after VDD has reached a level higher than VTH2 + VHYS2. When VDD falls below VTH2, the DS8023 executes a card deactivation sequence if its card interface is active. Clock Circuitry The clock signal from the DS8023 to the smart card (CLK) is generated from the clock input on XTAL1 or from a crystal operating at up to 20MHz connected between pins XTAL1 and XTAL2.
PAGE 9
DS8023 Smart Card Interface When a card is inserted into the reader (if PRES is active), the host microcontroller can begin an activation sequence (start a card session) by pulling CMDVCC low. The following events form an activation sequence (Figure 3): 1) Host: CMDVCC is pulled low. 2) DS8023: The internal oscillator changes to high frequency (t0). 3) DS8023: The voltage generator is started simultaneously (t1 = t0). 4) DS8023: Raise VCC from 0 to 5V, 3V, or 1.8V with a controlled slope (t2 = t1 + 1.
PAGE 10
DS8023 Smart Card Interface CMDVCC VCC ATR I/O CLK 200ns RSTIN RST I/OIN t0 t1 t2 t3 t4 t5 = tACT Figure 4. Activation Sequence at t3 CMDVCC RST CLK I/O VCC t10 t12 t13 t14 t15 tDE Figure 5.
PAGE 11
DS8023 Smart Card Interface Deactivation Sequence When the host microcontroller is done communicating with the smart card, it sets the CMDVCC line high to execute an automatic deactivation sequence and returns the card interface to the inactive mode. The following sequence of events occurs during a deactivation sequence (Figure 5): 1) RST goes low (t10). 2) CLK is held low (t12 = t10 + 0.5 × T), where T is 64 times the period of the internal oscillator (approximately 25µs).
PAGE 12
DS8023 Smart Card Interface PRES OFF CMDVCC DEBOUNCE DEBOUNCE VCC DEACTIVATION CAUSED BY CARDS WITHDRAWAL DEACTIVATION CAUSED BY SHORT CIRCUIT Figure 6. Behavior of PRES, OFF, CMDVCC, and VCC OFF PRES RST CLK I/O VCC t10 t12 t13 t14 t15 tDE Figure 7.
PAGE 13
DS8023 Smart Card Interface DEACTIVATE INTERFACE CMDVCC 1_8V ACTIVATE STOP MODE DEACTIVATE STOP MODE 5V/3V 8ms WARMUP DELAY 8ms DEBOUNCE STOP MODE OFF ASSERTED TO WAIT FOR DELAY OFF OFF FOLLOWS PRES IN STOP MODE PRES VCC Figure 8.
PAGE 14
DS8023 Smart Card Interface Smart Card Power Select logic-low state. Care must be exercised when switching from one VCC power selection to the other. If both 1_8V and 5V/3V are high with CMDVCC high at the same time, the DS8023 enters stop mode. To avoid accidental entry into stop mode, the state of 1_8V and 5V/3V must not be changed simultaneously. A minimum delay of 100ns should be observed between changing the states of 1_8V and 5V/3V. See Figure 9 for the recommended sequence of changing the VCC range.
PAGE 15
DS8023 Smart Card Interface VDD 100nF 33pF 33pF +3.3V 100nF 100nF +3.3V 100nF XTAL1 GPIO ... ... ... ... GPIO ISOIO0 XTAL2 GND CLKDIV1 CLKDIV2 5V/3V 1_8V OFF RSTIN CMDVCC AUX2IN AUX1IN I/OIN VDD CP1 CP2 VUP +10μF PGND VDDA 100kΩ** PRES VCC RST CLK I/O AUX1 AUX2 DS8023 100nF* 220nF* 100nF* 220nF* CGND MAXQ1103 GPIO ... ... ...
PAGE 16
DS8023 Smart Card Interface Applications Information Performance can be affected by the layout of the application. For example, an additional cross-capacitance of 1pF between card reader contacts C2 (RST) and C3 (CLK) or C2 (RST) and C7 (I/O) can cause contact C2 to be polluted with high-frequency noise from C3 (or C7). In this case, include a 100pF capacitor between contacts C2 and CGND.
PAGE 17
DS8023 Smart Card Interface Revision History REVISION NUMBER REVISION DATE 0 8/08 Initial release 4/13 Clarified t1, t5, t14, added note to Figure 10 describing PRES pin operation, and added package information 1 DESCRIPTION PAGES CHANGED — 9, 11, 15 Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied.