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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 7/20頁 |
| 文件大小： | 259K |
| 代理商： | LTC1955 |
LTC1955
7
sn1955 1955fs
PRES A/PRES B:
Card Socket. The PRES A/PRES B pins
are used to detect the presence of the smart cards. They
can be connected to either normally open or normally
closed detection switches on the smart card acceptor’s
sockets. The NC/NO pin should be set appropriately. These
pins have a pull-up current source on-chip so no external
components are required.
C4A/C8A:
Card Socket. These pins connect to the C4 and
C8 pins of synchronous memory cards on smart card
socket A. The signal for these pins is unidirectional and can
only be sent to the card. Data for C4A and C8A is transmit-
ted via the DATA pin and may be selected in place of I/OA
via the serial port (see Table 4). When either C4A or C8A
is selected, it will follow the DATA pin. When it is dese-
lected, it will remain latched at its current state.
I/O A/I/O B:
Card Socket. The I/O A/I/O B pins connect to
the I/O pins of the respective smart card sockets. When a
smart card is selected, its I/O pin connects to the DATA pin.
When a smart card is deselected, its I/O A/I/O B pin returns
to the idle state (H).
RST A/RST B:
Card Socket. These pins should be con-
nected to the RST pins of the respective smart card
sockets. The RST A/RST B signals are derived from the R
IN
pin. When a card is selected, its RST pin follows R
IN
. When
a card is deselected, the RST A/RST B pin for that channel
holds the current value on R
IN
.
CLK A/CLK B:
Card Socket. The CLK A/CLK B pins should
be connected to the CLK pins of the respective smart card
sockets. The CLK A/CLK B signals can be derived from
either the SYNC input or the ASYNC input depending on
which type of card is being accessed. The card type is
selected via the serial port (see Tables 1 and 3).
V
CCA
, V
CCB
:
Card Socket. The V
CCA
/V
CCB
pins should be
connected to the V
CC
pins of the respective smart card
sockets. The activation of a V
CCA
/V
CCB
pin is controlled by
the serial port (see Tables 1 and 2) and can be set to 0V,
1.8V, 3V or 5V. The voltage levels of the two card sockets
are controlled independently for maximum flexibility.
FAULT:
Output. The FAULT pin can be used as an interrupt
to a microcontroller to indicate when a fault has occurred.
It is an open drain output, which is logically equivalent to
D4 + D5 + D12 + D13. (See Table 1)
UNDERV:
Input. The UNDERV pin provides security by
supplying a precision undervoltage threshold for external
supply monitoring. An external resistive voltage divider
programs the desired undervoltage threshold. Once
UNDERV falls below 1.23V, the LTC1955 automatically
begins the deactivation sequence on any channel that is
active.
If external supply monitoring is not required, the UNDERV
pin should be connected to either SV
BATT
or DV
CC
.
PIU
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PDF描述 |
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| 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 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:24-HVQFN（4x4） 包裝:托盤 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 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:24-HVQFN（4x4） 包裝:托盤 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 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:24-HVQFN（4x4） 包裝:托盤 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 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:24-HVQFN（4x4） 包裝:托盤 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 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:24-HVQFN（4x4） 包裝:托盤 配用:568-3511-ND - DEMO BOARD SPI TO I2C 其它名稱:935286452157SC18IS600IBSSC18IS600IBS-ND |
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