參數(shù)資料
型號(hào)： LTC1955
廠商： Linear Technology Corporation
英文描述： Dual Smart Card Interface with Serial Control
中文描述： 雙智能卡接口，具有串行控制
文件頁(yè)數(shù)： 9/20頁(yè)
文件大?。?/td> 259K
代理商： LTC1955
LTC1955
9
sn1955 1955fs
Serial Port
The microcontroller compatible serial port provides all of
the command and control inputs for the LTC1955 as well
as the status of the two smart cards. Data on the D
IN
input
is loaded on the rising edge of SCLK. D15 is loaded first
and D0 last. At the same time the command bits are being
shifted into the D
IN
input, the status bits are being shifted
out of the D
OUT
output. The status bits are presented to
D
OUT
on the rising edge of SCLK. Once all bits have been
clocked into the shift register, the command data is loaded
into the command latch by bringing LD low. At this time
the command latch is updated and the LTC1955 will begin
to act on the new command set. When LD is low, the shift
register is transparent to the status data of the two smart
card channels. The status data is latched into the shift
register on the rising edge of LD. SCLK should be held in
the high state when idle and should only be clocked when
LD is high. Likewise LD should only be brought high when
SCLK is high. Figure 2 shows the operation of the serial
port.
Multiple LTC1955s may be daisy-chained together by
connecting the D
OUT
pin of one LTC1955 to the D
IN
pin of
another. Figure 7 shows an example of multiple LTC1955s
daisy chained together.
The maximum clock rate for the serial port is 10MHz.
The serial port controls the following parameters of each
smart card socket:
Selection/deselection of a smart card
V
CC
voltage level of each card (5V/3V/1.8V/0V)
Clock mode of each card (synchronous or asynchro-
nous)
Operating mode of asynchronous cards (clock stop
high, low,
÷
1,
÷
2,
÷
4 or
÷
8)
Selection of the I/O, C4 or C8 pins for card socket A
The serial port provides the following status data:
It indicates the presence or absence of the smart cards.
It indicates the readiness of the smart card V
CC
sup-
plies. Communication with a smart card is disabled
until its power supply voltage has reached the final
value.
It indicates fault status. In the event of an electrical or
ATR fault, the fault is reported. For electrical faults, the
LTC1955 will automatically deactivate the smart card.
Table 1 illustrates the command inputs and status outputs
associated with each bit of the serial data word.
Three voltage options are available from the LTC1955: 5V,
3V and 1.8V. Bits D0, D1 (card B) and D8, D9 (card A)
determine which voltage is selected. Setting both control
bits of a channel to 0 deactivates that channel and sets the
smart card supply voltage to 0V. If both channels are
deactivated, the LTC1955 is in shutdown. Table 2 shows
the operation of the supply control bits.
The CLK A/CLK B pins to the smart cards can be pro-
grammed for various modes. Both synchronous and asyn-
chronous cards are supported. There are several options
available with asynchronous cards. Table 3 shows how all
clock options are obtained using bits D5–D7 (card B) and
D13–D15 (card A). The default state of the LTC1955 on
power up is synchronous mode.
Figure 2. Serial Port Timing Diagram
D
IN
SCLK
LD
X
D0
D15
X
D1
D
OUT
D15 FROM
INPUT
D0
D15
1955 F02
D14
D13
D15
D1
t
LC
t
DH
t
DD
t
DS
t
H
t
L
t
LW
t
CL
D14
D2
OPERATIOU
相關(guān)PDF資料
PDF描述
LTC1955EUH Dual Smart Card Interface with Serial Control
LTC1957 40MHz to 900MHz Quadrature Demodulator
LT5500 40MHz to 900MHz Quadrature Demodulator
LT5511 40MHz to 900MHz Quadrature Demodulator
LT5515 40MHz to 900MHz Quadrature Demodulator
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC1955EUH 功能描述:IC INTERFACE DL SMART CARD 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 總線至 I²C 總線橋接 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:935286452157SC18IS600IBSSC18IS600IBS-ND
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 總線至 I²C 總線橋接 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: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 總線至 I²C 總線橋接 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: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 總線至 I²C 總線橋接 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: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 總線至 I²C 總線橋接 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:935286452157SC18IS600IBSSC18IS600IBS-ND
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*