參數(shù)資料
型號(hào)： LTC1955EUH
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 電源管理
英文描述： Dual Smart Card Interface with Serial Control
中文描述： 2-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC32
封裝： 5 X 5 MM, 0.75 MM HEIGHT, MO-220WHHD, QFN-32
文件頁(yè)數(shù)： 6/20頁(yè)
文件大?。?/td> 259K
代理商： LTC1955EUH
LTC1955
6
sn1955 1955fs
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. Asynchro-
nous cards can also be placed in clock stop mode with the
clock stopped either high or low.
D
IN
:
Input. Input for the serial port. Command data is
shifted into D
IN
synchronously with SCLK. D
IN
can be
connected directly to a microcontroller or the D
OUT
pin of
another LTC1955 for daisy chained operation.
D
OUT
:
Output. Output for the serial port. Smart card status
data is shifted out of D
OUT
synchronously with SCLK. D
OUT
can be connected directly to a microcontroller or the D
IN
pin of another LTC1955 for daisy chained operation.
SCLK:
Input. The SCLK pin clocks the serial port. Each new
data bit is received on the rising edge of SCLK. SCLK
should be left high during idle times and should not be
clocked when LD is low.
LD:
Input. The falling edge of this pin loads the current
state of the shift register into the command register.
Command changes to both smart card channels will be
updated on the falling edge of LD. The rising edge of LD
latches status information from the smart card channels
into the shift register for the next read/write cycle.
NC/NO:
Input. This pin controls the activation level of the
PRES A/PRES B pins. When it is high (DV
CC
), the PRES
pins are active high. When it is low (GND), the PRES pins
are active low. When a ground side N.O. switch is used, the
NC/NO pin should be grounded. When a ground side N.C.
switch is used, the NC/NO pin should be connected to
DV
CC
.
Note: If an N.C. switch is used, a small current (several
microamperes) will flow through the switch whenever a
smart card is not present. For ultralow power consump-
tion in shutdown, an N.O. switch is optimum.
PIU
SV
BATT
:
Power. Supply voltage for analog sections of the
LTC1955.
PV
BATT
:
Power. Supply voltage for the charge pump.
DV
CC
:
Power. Reference voltage for the control logic.
SGND:
Ground. Signal ground for analog sections of the
LTC1955.
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 4.7
μ
F X5R or X7R ceramic capacitor is re-
quired on CPO.
C
+
, C
–
:
Charge Pump. Charge pump flying capacitor pins.
A 1
μ
F 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
and C8A synchronous card pins can be selected to con-
nect to the DATA pin via the serial port (see Table 4).
R
IN
:
Input. The R
IN
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.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC1955EUH#PBF 功能描述:IC INTERFACE DL SMART CARD 32QFN RoHS:是 類(lèi)別:集成電路 (IC) >> 接口 - 控制器 系列:- 標(biāo)準(zhǔn)包裝:2,450 系列:- 控制器類(lèi)型:SPI 總線(xiàn)至 I²C 總線(xiàn)橋接 接口:I²C，串行，SPI 電源電壓:2.4 V ~ 3.6 V 電流 - 電源:11mA 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:24-HVQFN（4x4） 包裝:托盤(pán) 配用:568-3511-ND - DEMO BOARD SPI TO I2C 其它名稱(chēng):935286452157SC18IS600IBSSC18IS600IBS-ND
LTC1955EUH#TR 功能描述:IC SMART CARD INTERFC DUAL 32QFN RoHS:否 類(lèi)別:集成電路 (IC) >> 接口 - 控制器 系列:- 標(biāo)準(zhǔn)包裝:2,450 系列:- 控制器類(lèi)型:SPI 總線(xiàn)至 I²C 總線(xiàn)橋接 接口:I²C，串行，SPI 電源電壓:2.4 V ~ 3.6 V 電流 - 電源:11mA 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:24-HVQFN（4x4） 包裝:托盤(pán) 配用:568-3511-ND - DEMO BOARD SPI TO I2C 其它名稱(chēng):935286452157SC18IS600IBSSC18IS600IBS-ND
LTC1955EUH#TRPBF 功能描述:IC INTERFACE DL SMART CARD 32QFN RoHS:是 類(lèi)別:集成電路 (IC) >> 接口 - 控制器 系列:- 標(biāo)準(zhǔn)包裝:2,450 系列:- 控制器類(lèi)型:SPI 總線(xiàn)至 I²C 總線(xiàn)橋接 接口:I²C，串行，SPI 電源電壓:2.4 V ~ 3.6 V 電流 - 電源:11mA 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:24-HVQFN（4x4） 包裝:托盤(pán) 配用:568-3511-ND - DEMO BOARD SPI TO I2C 其它名稱(chēng):935286452157SC18IS600IBSSC18IS600IBS-ND
LTC1955IUH#PBF 功能描述:IC SMART CARD INTERFACE DL 32QFN RoHS:是 類(lèi)別:集成電路 (IC) >> 接口 - 控制器 系列:- 標(biāo)準(zhǔn)包裝:2,450 系列:- 控制器類(lèi)型:SPI 總線(xiàn)至 I²C 總線(xiàn)橋接 接口:I²C，串行，SPI 電源電壓:2.4 V ~ 3.6 V 電流 - 電源:11mA 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:24-HVQFN（4x4） 包裝:托盤(pán) 配用:568-3511-ND - DEMO BOARD SPI TO I2C 其它名稱(chēng):935286452157SC18IS600IBSSC18IS600IBS-ND
LTC1955IUH#TRPBF 功能描述:IC SMART CARD INTERFACE DL 32QFN RoHS:是 類(lèi)別:集成電路 (IC) >> 接口 - 控制器 系列:- 標(biāo)準(zhǔn)包裝:2,450 系列:- 控制器類(lèi)型:SPI 總線(xiàn)至 I²C 總線(xiàn)橋接 接口:I²C，串行，SPI 電源電壓:2.4 V ~ 3.6 V 電流 - 電源:11mA 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:24-HVQFN（4x4） 包裝:托盤(pán) 配用:568-3511-ND - DEMO BOARD SPI TO I2C 其它名稱(chēng):935286452157SC18IS600IBSSC18IS600IBS-ND
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