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參數(shù)資料
| 型號： | LTC1955IUH#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC32 |
| 封裝： | 5 X 5 MM, 0.75 MM HEIGHT, MO-220WHHD, QFN-32 |
| 文件頁數(shù)： | 1/20頁 |
| 文件大?。?/td> | 243K |
| 代理商： | LTC1955IUH#TR |
LTC1955
1
1955fb
TYPICAL APPLICATION
DESCRIPTION
Dual Smart Card Interface
with Serial Control
The LTC1955 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 prole (0.75mm) 5mm
× 5mm QFN package.
Deactivation Sequence
FEATURES
APPLICATIONS
n Compatible with ISO7816-3 and EMV Electrical
Specications
n Power Management and Control for Two Smart Cards
n Control/Status Serial Port May Be Daisychained for
Multicard Applications
n Automatic Shutdown on Electrical Faults
n Buck/Boost Charge Pump Generates 5V, 3V or 1.8V
Outputs (Smart Card Classes A, B and C)
n Independent 5V/3V/1.8V Level Control for Both Cards
n Automatic Level Translation
n Supervisory Functions Prevent Smart Card Faults
n Low Operating Current: 250μA Typical
n Ultralow Shutdown Current
n >10kV ESD on Smart Card Pins
n Small 32-Pin 5mm
× 5mm QFN Package
n Handheld Payment Terminals
n Pay Telephones
n ATM Machines
n POS Terminals
n Computer Keyboards
n Multiple S.A.M. Sockets
LT, LTC and LTM 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.
10μs/DIV
VCCA
5V/DIV
I/O A
5V/DIV
CLK A
5V/DIV
RST A
5V/DIV
1955 TA01a
4-WIRE
COMMAND
INTERFACE
4-WIRE
CARD
INTERFACE
SMART CARD
VENDOR CARD
C8A
C4A
I/O A
RST A
CLK A
VCCA
PRES B
3
4
5
6
7
8
21
2
CARD
DETECT
23
20
19
18
17
15
11
14
24
1
12,13
9, 10
29
30
32
31
22
27
28
26
25
I/O B
RST B
CLK B
VCCB
DVCC
VBATT
GND
FAULT
DIN
DOUT
SCLK
LD
DATA
RIN
SYNC
ASYNC
NC/NO
PRES A
UNDERV
240k
LTC1955
1μF
4.7μF
1955 TA01b
1μF
4.7μF
0.1μF
C+
C–
CPO
180k
INPUT
POWER
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