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參數(shù)資料
| 型號(hào)： | LTC1755EGN |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 其它接口 |
| 英文描述： | Smart Card Interface |
| 中文描述： | SPECIALTY INTERFACE CIRCUIT, PDSO24 |
| 封裝： | 0.150 INCH, PLASTIC, SSOP-24 |
| 文件頁(yè)數(shù)： | 6/12頁(yè) |
| 文件大?。?/td> | 160K |
| 代理商： | LTC1755EGN |
6
LTC1755
PI
FU
CTIO
N
S
U
U
DV
CC
(Pin 20):
Supply Voltage for the Microcontroller Side
Digital Input and Input/Output Pins (Typically 3V). If the
charge pump input pin (V
IN
) is powered from the same
source as the microcontroller, then DV
CC
should be con-
nected directly to V
IN
. In this case only one (10
μ
F) input
bypass capacitor is needed for the LTC1755. If the DV
CC
pin is powered separately then it should be bypassed
separately with a 0.1
μ
F capacitor. The DV
CC
pin may be
between 2V and 5.5V.
The DV
CC
pin is monitored for adequate voltage. If DV
CC
drops below approximately 1.5V the LTC1755 automati-
cally enters the Idle state.
READY (Pin 21):
(Output) Readiness Indicator of the
Smart Card Supply Voltage (V
CC
). When the LTC1755 is
placed in the Active state the soft start feature slowly
ramps the V
CC
voltage. A low on the READY pin indicates
that V
CC
has reached its final value.
The READY pin is configured as an open-drain pull-down
with a weak pull-up current source. This permits wired-
OR connections of multiple LTC1755s to a single micro-
controller.
ALARM (Pin 22):
(Output) A low on this pin indicates that
a fault has occurred and that the LTC1755 is in the Alarm
state (see the State Diagram). Possible faults include V
CC
underrange for at least 5
μ
s, overtemperature shutdown,
CLK or RST invalid output levels, and card removal during
the Active state.
CLK or RST invalid and overtemperature faults are de-
tected only after V
CC
has reached its final value (as
indicated by the READY pin). V
CC
underrange and card
removal during Active faults are detected at any time
during the Active period (i.e., once PWR = 0V).
The ALARM pin is configured as an open-drain pull-down
with a weak pull-up current source. This permits wired-
OR connections of multiple LTC1755s to a single micro-
controller.
CARD (Pin 23):
(Output) Level-Shifted and Debounced
PRES Signal from the Smart Card Acceptor Switch. When
a valid card indication appears, this pin communicates the
presence of the Smart Card to the microcontroller. The
CARD pin has an open-drain active pull-down with a weak
pull-up current source for logic-OR connections. The
debounce circuit ensures that a card has been present for
a continuous period of at least 40ms before asserting
CARD low. The CARD pin returns high within 50
μ
s of card
removal. The PRES pin, in conjunction with the NC/NO pin,
determines if a card is present.
5V/3V (Pin 24):
(Input) Controls the output voltage (V
CC
)
of the DC/DC converter during the Active state. A valid high
sets V
CC
to 5V. A valid low sets V
CC
to 3V. The 5V/3V pin
is latched on the falling edge of the PWR pin. When PWR
is low, changes on the 5V/3V pin are ignored. To change
the voltage on V
CC
the LTC1755 must first be returned to
the Idle state by bringing the PWR pin high.
DV
CC
sets the logic reference level for the 5V/3V pin.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1755EGN#PBF | 功能描述:IC SMART CARD INTERFACE 24SSOP RoHS:是 類別:集成電路 (IC) >> 接口 - 專用 系列:- 特色產(chǎn)品:NXP - I2C Interface 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:2 通道 I²C 多路復(fù)用器 接口:I²C，SM 總線 電源電壓:2.3 V ~ 5.5 V 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:16-TSSOP 包裝:剪切帶 (CT) 安裝類型:表面貼裝 產(chǎn)品目錄頁(yè)面:825 (CN2011-ZH PDF) 其它名稱:568-1854-1 |
| LTC1755EGN#TR | 功能描述:IC SMART CARD INTERFACE 24SSOP RoHS:否 類別:集成電路 (IC) >> 接口 - 專用 系列:- 特色產(chǎn)品:NXP - I2C Interface 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:2 通道 I²C 多路復(fù)用器 接口:I²C，SM 總線 電源電壓:2.3 V ~ 5.5 V 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:16-TSSOP 包裝:剪切帶 (CT) 安裝類型:表面貼裝 產(chǎn)品目錄頁(yè)面:825 (CN2011-ZH PDF) 其它名稱:568-1854-1 |
| LTC1755EGN#TRPBF | 功能描述:IC SMART CARD INTERFACE 24SSOP RoHS:否 類別:集成電路 (IC) >> 接口 - 專用 系列:- 特色產(chǎn)品:NXP - I2C Interface 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:2 通道 I²C 多路復(fù)用器 接口:I²C，SM 總線 電源電壓:2.3 V ~ 5.5 V 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:16-TSSOP 包裝:剪切帶 (CT) 安裝類型:表面貼裝 產(chǎn)品目錄頁(yè)面:825 (CN2011-ZH PDF) 其它名稱:568-1854-1 |
| LTC1755EGNPBF | 制造商:Linear Technology 功能描述:Smart Card Interface LTC1755EGN |
| LTC1755ENG#PBF | 制造商:LT 功能描述: |
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