參數(shù)資料
型號(hào)： LTC1955EUH
廠(chǎng)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)： 10/20頁(yè)
文件大?。?/td> 259K
代理商： LTC1955EUH
LTC1955
10
sn1955 1955fs
To receive status data from the serial port, a read/write
operation must be performed. When polling for the pres-
ence of a smart card on both channels, the input word
should be set to $0000 since this is the shutdown com-
mand for the LTC1955. However, consider the example
where some operation is already being performed on
channel A. If, for example, the previous command was
$BE00 (V
CCA
set to 3V, card selected, I/O A connected to
DATA and CLK A set to ASYNC
÷
2), then the commands for
this channel must be rewritten to the serial port each time.
To poll for the presence of a card on channel B, or even the
V
CCA
READY status, then $BE00 should be rewritten on
each new read/write cycle. Once a card is detected on
channel B, the commands for channel B can be changed
but the $BExx should continue to be rewritten for channel
A.
Bidirectional Channels
The bidirectional channels are level shifted to the appropri-
ate V
CCA/B
voltages at the I/O A/I/O B pins.
An NMOS pass transistor performs the level shifting. The
gate of the NMOS transistor is biased such that the
transistor is completely off when both sides have relin-
quished the channel. If one side of the channel asserts an
L, then the transistor will convey the L to the other side.
Note that current passes from the receiving side of the
channel to the transmitting side. The low output voltage of
the receiving side will be dependent upon the voltage at the
transmitting side plus the I R drop of the pass transistor.
When a card socket is selected, it becomes a candidate to
drive data on the DATA pin and likewise receive data from
the DATA pin. When a card socket is deselected, the
voltage on its I/O A/I/O B pin will return to the idle state (H)
and the DATA side of that channel will become high
impedance. If both cards are deselected, the DATA pin will
be high impedance.
Both cards may be deselected at the same time to allow
communication with a second LTC1955.
Card channel A includes provision for unidirectional com-
munication with the C4 and C8 pins of the smart card. The
C4, C8 and I/O pins of card A are individually multiplexed
to the DATA pin using bits D11 and D12 as shown in
Table4.
Table 1. Serial Port Commands
STATUS OUTPUT
CARD B
0
0
0
0
Card B Electrical Fault
Card B ATR Fault
Card B V
CC
Ready
Card B Present
CARD A
0
0
0
0
Card A Electrical Fault
Card A ATR Fault
Card A V
CC
Ready
Card A Present
BIT
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
COMMAND INPUT
V
CCB
Options
(See Table 2)
Card B Select/Deselect
Data Pull-Up Defeat
Reserved (Always Set to “0”)
Card B Clock Options
(See Table 3)
V
CCA
Options
(See Table 2)
Card A Select/Deselect
Card A Communications
Options (See Table 4)
Card A Clock Options
(See Table 3)
Table 2. V
CC
and Shutdown Options
D9
D8
Status (Card A)
D1
D0
Status (Card B)
0
0
V
CC
= 0V (Shutdown)
0
1
V
CC
= 1.8V
1
0
V
CC
= 3V
1
1
V
CC
= 5V
Table 3. Clock Options
D7
D6
D15
D14
0
0
0
0
0
1
0
1
1
0
1
0
1
1
1
1
D5
D13
0
1
0
1
0
1
0
1
Clock Mode Card B
Clock Mode Card A
Synchronous Mode
Unused
Asynchronous Stop Low
Asynchronous Stop High
Asynchronous
÷
1
Asynchronous
÷
2
Asynchronous
÷
4
Asynchronous
÷
8
OPERATIOU
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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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