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參數(shù)資料
| 型號： | LTC1955IUH#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 19/22頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC SMART CARD INTERFACE DL 32QFN |
| 標準包裝： | 2,500 |
| 控制器類型： | 智能卡接口 |
| 接口： | 4 線串行 |
| 電源電壓： | 1.7 V ~ 5.5 V |
| 電流 - 電源： | 10µA |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 32-WFQFN 裸露焊盤 |
| 供應商設(shè)備封裝： | 32-QFN 裸露焊盤（5x5） |
| 包裝： | 帶卷 (TR) |
LTC1955
6
1955fd
For more information www.linear.com/LTC1955
Typical perForMance characTerisTics
Charge Pump and LDO Activation
Deactivation Sequence
Data – I/O Channel, CL = 50pF
pin FuncTions
SVBATT: Power. Supply voltage for analog sections of the
LTC1955.
PVBATT: Power. Supply voltage for the charge pump.
DVCC: Power. Reference voltage for the control logic.
SGND: Ground. Signal ground for analog sections of the
LTC1955. The Exposed Pad must be soldered to PCB
ground.
PGND: Ground. Power ground for the charge pump. This
pin should be connected directly to a low impedance
ground plane.
CPO: Charge Pump. CPO is the output of the charge pump.
When one or both of the smart cards requires power, the
charge pump will charge CPO to either 3.7V or 5.35V
depending on what smart card voltages are required. A
low impedance 4.7F X5R or X7R ceramic capacitor is
required on CPO.
C+, C–: Charge Pump. Charge pump flying capacitor pins.
A 1F X5R or X7R ceramic capacitor should be connected
from C+ to C–.
DATA: Input/Output. Microcontroller side data I/O pin. The
DATA pin provides the bidirectional communication path
to both smart cards. One, both or neither of the cards may
be selected to communicate via the DATA pin. If several
LTC1955s are connected in parallel, the DATA pin can be
made high impedance by selecting neither card. The C4A
andC8Asynchronouscardpinscanbeselectedtoconnect
to the DATA pin via the serial port (see Table 4).
RIN: Input. The RIN pin supplies the RST signal to both
smart cards. It is level shifted and transmitted directly
to the RST pin of a selected card socket. When a card is
deselected, the RST A/RST B pin for that channel is latched
at its current state.
SYNC: Input. The SYNC pin provides the clock input for
synchronous smart cards. When a synchronous card
is selected, its CLK pin follows SYNC directly. When a
synchronous card is deselected, the CLK A/CLK B pin for
that channel is latched at its current state.
ASYNC: Input. The ASYNC pin provides the clock input
for asynchronous cards and should be connected to a free
running clock. The clock signal to the smart card can be
a ÷1, ÷2, ÷4 or ÷8 version of the signal on ASYNC. Asyn-
chronous cards can also be placed in clock stop mode
with the clock stopped either high or low.
DIN: Input. Input for the serial port. Command data is
shifted into DIN synchronously with SCLK. DIN can be
connected directly to a microcontroller or the DOUT pin of
another LTC1955 for daisychained operation.
DOUT: Output. Output for the serial port. Smart card status
data is shifted out of DOUTsynchronouslywithSCLK.DOUT
can be connected directly to a microcontroller or the DIN
pin of another LTC1955 for daisychained operation.
10s/DIV
VCCA
5V/DIV
I/O A
5V/DIV
CLK A
5V/DIV
RST A
5V/DIV
1955 G11
1ms/DIV
VCCA
5V/DIV
VCPO
5V/DIV
I/O A
5V/DIV
1955 G10
100ns/DIV
DATA
2V/DIV
I/O A
2V/DIV
1955 G12
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