- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄98002 > LTC1955IUH (LINEAR TECHNOLOGY CORP) 2-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC32 PDF資料下載
參數(shù)資料
| 型號： | LTC1955IUH |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC32 |
| 封裝： | 5 X 5 MM, 0.75 MM HEIGHT, MO-220WHHD, QFN-32 |
| 文件頁數(shù)： | 7/20頁 |
| 文件大?。?/td> | 243K |
| 代理商： | LTC1955IUH |
LTC1955
15
1955fb
Interfacing to a Microcontroller
The serial port of the LTC1955 can be connected directly
to a 68HC11 style microcontroller’s serial port. The mcro-
controller should be congured as the master device and
its clock’s idle state should be set to high (MSTR = 1,
CPOL = 1 and CPHA = 0 for the MC68HC11 family).
Figure 4 shows the recommended conguration and
direction of data ow. Note that an additional I/O line
is necessary for LD to load the data once it has shifted
around the loop. Command data is latched into the com-
mand register on the falling edge of the LD signal. The
LTC1955 will begin to act on new command data as soon
as LD goes low. Any general purpose microcontroller I/O
line can be congured to control the LD pin.
The status of the LTC1955 is returned over the serial
port. Status data is latched into the shift register on the
rising edge of the LD pin. Whenever the system is wait-
ing for status data from the LTC1955, its LD pin should
be held low.
Daisychained Operation
For applications requiring more than two card sockets,
the serial port of the LTC1955 is designed to be easily
daisychained. The DOUT pin of one LTC1955 can be con-
nected directly to the DIN pin of another LTC1955. Rather
than sending two 8-bit bytes before asserting LD, the
microcontroller should send two 8-bit bytes per device. LD
should only be asserted after all devices have been updated.
Figure 6 shows three LTC1955s cascaded in daisychain
fashion. In this case, the microcontroller would write six
8-bit bytes before asserting the LD pin. Alternatively, if
two serial ports are available on the microcontroller, then
two LTC1955s can be controlled independently.
If the DATA lines of two or more LTC1955s are connected
together, the static pull-up current will be the sum of the
devices. The static current can be brought back to the level
of a single LTC1955 by setting bit D3 on all but one of the
LTC1955s to 1 (see Table 1). Bit D3 disables the pull-up
current source on the DATA pin. This will help prevent VOL
problems in multiple LTC1955 applications when driving
the DATA or I/O pins low.
CARD A
CARD B
1955 F04
DIN
DOUT
SCLK
LD
LTC1955
MOSI
MISO
SCK
I/O
μCONTROLLER
Figure 4. Microcontroller Interface
APPLICATIONS INFORMATION
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC2900-1CMS#TRPFB | 4-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 |
| LTC3125EDCB#TRPBF | SWITCHING REGULATOR, 1900 kHz SWITCHING FREQ-MAX, PDSO8 |
| LTC3125EDCB#PBF | SWITCHING REGULATOR, 1900 kHz SWITCHING FREQ-MAX, PDSO8 |
| LTC3406ES5-1.2#PBF | 1.3 A SWITCHING REGULATOR, 1800 kHz SWITCHING FREQ-MAX, PDSO5 |
| LTC3414MPFE#PBF | 9.5 A SWITCHING REGULATOR, 4000 kHz SWITCHING FREQ-MAX, PDSO20 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| LTC1955IUH#TRPBF | 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 |
| LTC1957-1EMS8 | 功能描述:IC RF PWR CONTRLLR SINGLE 8-MSOP RoHS:否 類別:RF/IF 和 RFID >> RF 電源控制器 IC 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:- RF 型:GSM 頻率:450MHz ~ 2GHz 特點:四頻帶 封裝/外殼:8-VFBGA 供應(yīng)商設(shè)備封裝:8-MicroSMD（1.51x1.51） 包裝:帶卷 (TR) 其它名稱:LMV243BLX |
| LTC1957-1EMS8#PBF | 功能描述:IC RF PWR CONTRLLR SINGLE 8-MSOP RoHS:是 類別:RF/IF 和 RFID >> RF 電源控制器 IC 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:- RF 型:GSM 頻率:450MHz ~ 2GHz 特點:四頻帶 封裝/外殼:8-VFBGA 供應(yīng)商設(shè)備封裝:8-MicroSMD（1.51x1.51） 包裝:帶卷 (TR) 其它名稱:LMV243BLX |
| LTC1957-1EMS8#TR | 功能描述:IC RF PWR CONTRLLR SINGLE 8-MSOP RoHS:否 類別:RF/IF 和 RFID >> RF 電源控制器 IC 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:- RF 型:GSM 頻率:450MHz ~ 2GHz 特點:四頻帶 封裝/外殼:8-VFBGA 供應(yīng)商設(shè)備封裝:8-MicroSMD（1.51x1.51） 包裝:帶卷 (TR) 其它名稱:LMV243BLX |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。