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LTC1955EUH Datasheet

  • LTC1955EUH

  • Dual Smart Card Interface with Serial Control

  • 20頁

  • LINER

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FEATURES
s
s
LTC1955
Dual Smart Card Interface
with Serial Control
DESCRIPTIO
The LTC
廬
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 daisy-chain fashion so that the number of wires to the
card socket board is independent of the number of sock-
ets. 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 small 5mm
脳
5mm QFN
package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
*U.S. Patent No. 6,411,531
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s
s
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Compatible with ISO7816-3 and EMV Electrical
Specifications
Power Management and Control for Two Smart
Cards
Control/Status Serial Port May be Daisy-Chained
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: 250碌A(chǔ) Typical
Ultralow Shutdown Current
>10kV ESD on Smart Card Pins
Small 32-Pin 5mm
脳
5mm QFN Package
APPLICATIO S
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Handheld Payment Terminals
Pay Telephones
ATM Machines
POS Terminals
Computer Keyboards
Multiple S.A.M. Sockets
TYPICAL APPLICATIO
Deactivation Sequence
RST A
5V/DIV
240k
23
180k
INPUT
POWER
UNDERV
2
1
DV
CC
PRES A
12,13
V
BATT
0.1碌F
4.7碌F
9, 10
24
27
LTC1955
GND
FAULT
D
IN
D
OUT
SCLK
LD
PRES B
C8A
C4A
I/O A
RST A
CLK A
V
CCA
3
4
5
6
7
8
21
1碌F
CLK A
5V/DIV
4-WIRE
COMMAND
INTERFACE
28
26
25
I/O A
5V/DIV
29
V
CCA
5V/DIV
10碌s/DIV
1955 G11.eps
4-WIRE
CARD
INTERFACE
30
32
31
22
DATA
R
IN
SYNC
ASYNC
NC/NO
C
+
14
C
鈥?/div>
11
I/O B
RST B
CLK B
V
CCB
CPO
15
4.7碌F
1碌F
U
20
19
18
17
U
U
CARD
DETECT
SMART CARD
VENDOR CARD
1碌F
1955 TA01
sn1955 1955fs
1

LTC1955EUH 產(chǎn)品屬性

  • LTC1955

  • 73

  • 集成電路 (IC)

  • 接口 - 控制器

  • -

  • 智能卡接口

  • 4 線串行

  • 1.7 V ~ 5.5 V

  • 10µA

  • -40°C ~ 85°C

  • 表面貼裝

  • 32-WFQFN 裸露焊盤

  • 32-QFN 裸露焊盤（5x5）

  • 管件

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