LTC1955_15,LTC1955_15 pdf中文资料,LTC1955_15引脚图,LTC1955

LTC1955

Dual Smart Card Interface

with Serial Control

FeaTures

n

DescripTion

The

LTC

®

1955

provides all necessary supervisory and

power control functions for two smart cards, two S.A.M.

cards or a combination of S.A.M. and smart cards. It

provides a charge pump for battery-powered applications

as well as all necessary level shifting circuitry.

The card voltages can be independently set to 1.8V, 3V or

5V. Both card interfaces include a card detection channel

with automatic debounce circuitry. To reduce wiring costs,

the LTC1955 interfaces to a microcontroller via a simple

4-wire serial interface. Multiple devices may be connected

in daisychain fashion so that the number of wires to the

card socket board is independent of the number of sockets.

Status data is returned over the same interface.

Extensive security features ensure proper deactivation

sequencing in the event of a supply fault or a smart card

electrical fault. The smart card pins can withstand greater

than 10kV ESD in-situ with no additional components.

The LTC1955 is available in a low profile (0.75mm) 5mm

×

5mm QFN package.

L,

LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

Protected by U.S. Patents, including 6356140, 6411531.

n

Compatible with ISO7816-3 and EMV Electrical

Specifications

Power Management and Control for Two Smart Cards

Control/Status Serial Port May Be Daisychained for

Multicard Applications

Automatic Shutdown on Electrical Faults

Buck/Boost Charge Pump Generates 5V, 3V or 1.8V

Outputs (Smart Card Classes A, B and C)

Independent 5V/3V/1.8V Level Control for Both Cards

Automatic Level Translation

Supervisory Functions Prevent Smart Card Faults

Low Operating Current: 250µA Typical

Ultralow Shutdown Current

>10kV ESD on Smart Card Pins

Small 32-Lead 5mm

×

5mm QFN Package

applicaTions

n

Handheld Payment Terminals

Pay Telephones

ATM Machines

POS Terminals

Computer Keyboards

Multiple S.A.M. Sockets

Typical applicaTion

1

240k

23

DV

CC

V

BATT

LTC1955

GND

FAULT

D

IN

D

OUT

SCLK

LD

180k

Deactivation Sequence

RST A

5V/DIV

CLK A

5V/DIV

I/O A

5V/DIV

V

CCA

5V/DIV

10µs/DIV

1955 TA01a

INPUT

POWER

12,13

0.1µF

4.7µF

9, 10

24

27

UNDERV

2

PRES A

3

4

5

6

7

8

21

CARD

DETECT

C8A

C4A

I/O A

RST A

CLK A

V

CCA

4-WIRE

COMMAND

INTERFACE

28

26

25

SMART CARD

1µF

PRES B

29

4-WIRE

CARD

INTERFACE

30

32

31

22

DATA

R

IN

SYNC

ASYNC

NC/NO

C

+

14

C

–

11

I/O B

RST B

CLK B

V

CCB

CPO

15

20

19

18

17

1µF

1955 TA01b

VENDOR CARD

1µF

4.7µF

1955fd

For more information

www.linear.com/LTC1955

1

LTC1955

absoluTe MaxiMuM raTings

(Note 1)

pin conFiguraTion

TOP VIEW

ASYNC

V

BATT

, DV

CC

, CPO,

FAULT,

UNDERV

to GND ....................................... –0.3V to 6.0V

PRES A/PRES B, DATA, R

IN

, SYNC, ASYNC,

LD,

D

IN

, SCLK to GND .................–0.3V to (DV

CC

+ 0.3V)

I/O A............................................ –0.3V to (V

CCA

+ 0.3V)

I/O B............................................ –0.3V to (V

CCB

+ 0.3V)

I

VCCA

/IV

CCB

.............................................................80mA

V

CCA

/V

CCB

Short-Circuit Duration..................... Indefinite

Operating Temperature Range (Note 4).... –40°C to 85°C

Junction Temperature ........................................... 125°C

Storage Temperature Range................... –65°C to 125°C

SYNC

SCLK

CPO

DATA

D

OUT

R

IN

D

IN

32 31 30 29 28 27 26 25

DV

CC

1

PRES A 2

C8A 3

C4A 4

I/O A 5

RST A 6

CLK A 7

V

CCA

8

9 10 11 12 13 14 15 16

SV

BATT

PV

BATT

SGND

PGND

NC

–

+

LD

24

FAULT

23

UNDERV

22 NC/NO

21 PRES B

20 I/O B

19 RST B

18 CLK B

17 V

CCB

33

SGND

UH PACKAGE

32-LEAD (5mm

×

5mm) PLASTIC QFN

T

JMAX

= 125°C,

θ

JA

= 34°C/W

EXPOSED PAD (PIN 33) IS SGND, MUST BE SOLDERED TO PCB

orDer inForMaTion

LEAD FREE FINISH

LTC1955EUH#PBF

LTC1955IUH#PBF

LEAD BASED FINISH

LTC1955EUH

LTC1955IUH

TAPE AND REEL

LTC1955EUH#TRPBF

LTC1955IUH#TRPBF

TAPE AND REEL

LTC1955EUH#TR

LTC1955IUH#TR

PART MARKING*

1955

PART MARKING*

1955

PACKAGE DESCRIPTION

32-Lead (5mm

×

5mm) Plastic QFN

32-Lead (5mm

×

5mm) Plastic QFN

PACKAGE DESCRIPTION

32-Lead (5mm

×

5mm) Plastic QFN

32-Lead (5mm

×

5mm) Plastic QFN

TEMPERATURE RANGE

–40°C to 85°C

TEMPERATURE RANGE

–40°C to 85°C

Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.

For more information on lead free part marking, go to:

http://www.linear.com/leadfree/

For more information on tape and reel specifications, go to:

http://www.linear.com/tapeandreel/

elecTrical characTerisTics

PARAMETER

Input Power Supply

V

BATT

Operating Voltage

I

PVBATT

+ I

SVBATT

Operating Current

I

PVBATT

+ I

SVBATT

Shutdown Current

DV

CC

Operating Voltage

The

l

denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at T

A

= 25°C. V

PVBATT

= V

SVBATT

= 3.3V, DV

CC

= 3.3V, unless otherwise noted.

CONDITIONS

l

C

MIN

2.7

C

TYP

MAX

5.5

UNITS

V

µA

V

1955fd

V

CCA

= 5V, V

CCB

= 0V, I

CCA

= 0µA

V

CCA

= V

CCB

= 5V, I

CCA

= I

CCB

= 0µA

No Cards Present. V

CPO

= 0V

l

250

350

0.75

1.7

400

500

1.75

5.5

2

For more information

www.linear.com/LTC1955

LTC1955

elecTrical characTerisTics

PARAMETER

I

DVCC

Operating Current

I

DVCC

Shutdown Current

Charge Pump

R

OLCP

5V Mode Open-Loop Output Resistance

CPO Turn-On Time

Smart Card Supplies V

CCA

, V

CCB

V

CCA/B

Output Voltage

V

CCA/B

Turn-On Time

Undervoltage Detection

Overcurrent Detection

Smart Card Detection

Debounce Time (

Deactivation Time (

CLK A, CLK B

Low Level Output Voltage (V

OL

), (Note 2)

High Level Output Voltage (V

OH

), (Note 2)

Rise/Fall Time (Note 2)

CLK A, CLK B Frequency (Note 2)

RST A, RST B, C4A, C8A

Low Level Output Voltage (V

OL

), (Note 2)

High Level Output Voltage (V

OH

), (Note 2)

Rise/Fall Time (Note 2)

I/O A, I/O B

Low Level Output Voltage (V

OL

), (Note 2)

High Level Output Voltage (V

OH

), (Note 2)

Rise/Fall Time (Note 2)

Short-Circuit Current (Note 2)

DATA

Low Level Output Voltage (V

OL

)

High Level Output Voltage (V

OH

)

Rise/Fall Time

R

IN

, D

IN

, SCLK,

LD,

SYNC, ASYNC, NC/NO

Low Input Threshold (V

IL

)

High Input Threshold (V

IH

)

Input Current (I

IH

/I

IL

)

l

The

l

denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at T

A

= 25°C. V

PVBATT

= V

SVBATT

= 3.3V, DV

CC

= 3.3V, unless otherwise noted.

CONDITIONS

l

MIN

TYP

10

0.5

5.7

0.6

MAX

25

1.5

8.5

1.5

5.35

3.25

1.95

1.5

–2.5

135

60

2.5

250

0.2

UNITS

µA

Ω

ms

V

ms

%

mA

ms

µA

µs

V

ns

MHz

V

BATT

= 3.075V, I

CPO

= I

CCA

+ I

CCB

= 120mA (Note 3)

l

I

CCA/B

= 0mA, 10% to 90%

5V Mode, 0 < I

CCA/B

< 60mA

3V Mode, 0 < I

CCA/B

< 50mA

1.8V Mode, 0 < I

CCA/B

< 30mA

I

CCA/B

= 0mA, 10% to 90%

Relative to Nominal Output

5V Mode

l

4.65

2.75

1.65

–9

65

20

5

3

1.8

0.8

–5

100

35

1.25

20

PRES A/B to

D15/D7)

V

NC/NO

= 0V

V

PRESA/B

= 0

I

CCA/B

= 0mA, C

VCCA/B

= 1µF

Sink Current = –200µA

Source Current = 200µA

Loaded with 50pF 10% to 90%

,

l

PRES A, PRES B Pull-Up Current

RST to V

CC

= 0.4V)

l

V

CCA/B

– 0.2

16

10

0.2

V

CCA/B

– 0.2

100

0.3

0.85 • V

CCA/B

500

5

10

0.3

0.8 • DV

CC

500

0.15 • DV

CC

0.85 • DV

CC

–1

1

Sink Current = –200µA

Source Current = 200µA

Loaded with 50pF 10% to 90%

,

Sink Current = –1mA (V

DATA

= 0V)

Source Current = 20µA (V

DATA

= V

DVCC

)

Loaded with 50pF 10% to 90%

,

V

DATA

= 0V

Sink Current = –500µA (V

I/OA/B

= 0V)

Source Current = 20µA (V

I/OA/B

= V

CCA/B

)

Loaded with 50pF 10% to 90%

,

l

V

ns

V

ns

mA

V

ns

V

µA

l

1955fd

For more information

www.linear.com/LTC1955

3

LTC1955

elecTrical characTerisTics

PARAMETER

D

OUT

Low Level Output Voltage (V

OL

)

High Level Output Voltage (V

OH

)

UNDERV

Threshold

Leakage Current

FAULT

Low Level Output Voltage (V

OL

)

Leakage Current

SYMBOL

Serial Port Timing

t

DS

t

DH

t

DD

t

L

t

H

t

CL

t

LC

t

LFC

D

IN

Valid to SCLK Setup

D

IN

Valid to SCLK Hold

D

OUT

Output Delay

SCLK Low Time

SCLK High Time

SCLK to

LD

to SCLK

LD

Falling to SCLK

C

LOAD

= 15pF

l

The

l

denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at T

A

= 25°C. V

PVBATT

= V

SVBATT

= 3.3V, DV

CC

= 3.3V, unless otherwise noted.

CONDITIONS

Sink Current = –200µA

Source Current = 200µA

l

MIN

TYP

MAX

0.3

UNITS

V

DV

CC

– 0.3

1.17

1.23

1.29

50

0.005

0.3

1

MIN

8

15

50

0

50

60

TYP

MAX

V

nA

V

µA

UNITS

ns

V

UNDERV

= 3.3V

Sink Current = –200µA

V

FAULT

= 5.5V

PARAMETER

CONDITIONS

l

Note 1:

Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2:

This specification applies to all three smart card voltage classes:

1.8V, 3V and 5V.

Note 3:

R

OLCP

@

(2V

BATT

– V

CPO

)/I

CPO

; V

CPO

will depend upon total load

(I

CCA

+ I

CCB

) and minimum supply voltage V

BATT

. See Figure 5.

Note 4:

The LTC1955E is guaranteed to meet performance specifications

from 0°C to 85°C. Specifications over the –40°C to 85°C operating

ambient temperature range are assured by design, characterization and

correlation with statistical process controls. The LTC1955I is guaranteed to

meet performance specifications over the full –40°C to 85°C temperature

range.

1955fd

4

For more information

www.linear.com/LTC1955

LTC1955

Typical perForMance characTerisTics

600

500

SUPPLY CURRENT (µA)

400

300

200

100

0

2.7

No Load Supply Current vs V

BATT

T

A

= 25°C

I

CCA

= I

CCB

= 0µA

SHORT-CIRCUIT CURRENT (mA)

V

CCA

= V

CCB

= 5V

I/O X Short-Circuit Current

vs Temperature

6.0

DV

CC

= V

BATT

= 5.5V

V

CCX

= 5V

OUTPUT RESISTANCE ( )

7.0

Charge Pump Open-Loop Output

Resistance vs Temperature

(2V

IN

– V

CPO

) / I

LOAD(MAX)

V

IN

= 2.7V

V

CPO

= 4.9V

5.5

6.5

5.0

6.0

V

CCA

= 1.8V, V

CCB

= 0V

4.5

5.5

4.0

5.0

3.1

3.5 3.9 4.3 4.7

SUPPLY VOLTAGE (V)

5.1

5.5

3.5

–40

–15

10

35

TEMPERATURE (°C)

60

85

1955 G02

4.5

–40

–15

10

35

TEMPERATURE (°C)

60

85

1955 G03

1955 G01

V

CCX

Overcurrent Shutdown

Threshold vs Temperature

180

V

BATT

= 3.3V

V

CPO

= 5.75V

DEBOUNCE TIME (ms)

60

55

V

CCX

= 1.8V

50

45

40

35

30

60

85

1955 G04

Card Detection Debounce Time

vs V

BATT

Supply Voltage

I/O A, I/O B LOW OUTPUT VOLTAGE (V)

Bidirectional Channel (I/O A, I/O B)

Low Output Level vs Temperature

0.16

V

DATA

= 0V

I

OL

= –1mA

V

BATT

= 2.7V

V

CCX

= 1.8V

160

LOAD CURRENT (mA)

T

A

= 85°C

T

A

= 25°C

0.14

140

0.12

V

CCX

= 3V

120

V

CCX

= 3V

0.10

V

CCX

= 5V

T

A

= –40°C

100

V

CCX

= 5V

80

–40

–15

10

35

TEMPERATURE (°C)

0.08

25

2.7

3.1

3.9 4.3 4.7 5.1

V

BATT

SUPPLY VOLTAGE (V)

3.5

5.5

1955 G05

0.06

–40

–15

10

35

TEMPERATURE (°C)

60

85

1955 G06

V

BATT

Quiescent Current

[I

BATT

– 2 (I

CCA

+ I

CCB

)]

vs Load Current

10

V

BATT

QUIESCENT CURRENT (mA)

9

8

SUPPLY CURRENT (µA)

7

6

5

4

3

2

1

0

10µ

100µ

1m

10m

LOAD CURRENT (A)

100m

1955 G07

V

BATT

Shutdown Current

vs Supply Voltage

3.0

2.5

2.0

T

A

= 25°C

1.5

1.0

0.5

0

2.7

T

A

= –40°C

SUPPLY CURRENT (µA)

V

DVCC

= V

BATT

1.0

DV

CC

Shutdown Current

vs Supply Voltage

V

DVCC

= V

BATT

V

BATT

= 3.1V

T

A

= 25°C

0.8

T

A

= –40°C

0.6

0.4

T

A

= 85°C

T

A

= 25°C, 85°C

0.2

3.1

3.9 4.3 4.7 5.1

V

BATT

SUPPLY VOLTAGE (V)

3.5

5.5

0

2.7

3.1

3.5 3.9 4.3 4.7 5.1

V

DVCC

SUPPLY VOLTAGE (V)

5.5

1955 G08

1955 G09

1955fd

For more information

www.linear.com/LTC1955

5

LTC1955_15

LTC1955_15概述

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