參數(shù)資料
型號(hào)： MAX14502AETL+T
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 15/41頁(yè)
文件大?。?/td> 0K
描述： IC CARD READER USB-SD 40-TQFN
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 2,500
應(yīng)用： USB
接口： I²C，2 線串口
電源電壓： 1.8 V ~ 3.3 V
封裝/外殼： 40-WFQFN 裸露焊盤(pán)
供應(yīng)商設(shè)備封裝： 40-TQFN-EP（5x5）
包裝： 帶卷 (TR)
安裝類(lèi)型： 表面貼裝
MAX14500–MAX14503
Hi-Speed USB-to-SD Card
Readers with Bypass
22
______________________________________________________________________________________
go to sleep. Because the BUSY output (BSY bit in I2C)
indicates Card Reader mode, the host P may monitor
this output after commanding a mode change to deter-
mine when the change takes place (Figure 9). If the host
requests the other SD card to enter Card Reader mode,
the busy flag deasserts and reasserts to let the host
know that the change took place.
Simple Control (I2C_SEL = Low)
The MAX14500–MAX14503 feature a very simple con-
trol scheme for entering Card Reader mode that
requires a single logic (GPIO) from the host P. The
simple control may only be used with the single SD port
versions. When I2C_SEL is connected low at startup,
the MODE input controls whether the device is in Pass
Thru or Card Reader mode. Driving MODE low enables
Pass Thru mode (Figure 10), and the host P has a
direct connection to the SD card and USB connector
through internal analog switches. Driving MODE high
enables Card Reader mode between SD card 1 and
the PC through the USB connector (Figure 11).
BERR/INT functions as the bridge error output BERR
that asserts for card reader errors. Interrupts are not
enabled, the clock source is set to the default as
defined by the part number, and the BERR and BUSY
outputs are active. Upon MODE transitioning high, SD
card 1 connects to the USB connector in Card Reader
mode and BUSY asserts low. The BUSY output indi-
cates that the device is in Card Reader mode. BUSY
may be important to the host P, as the time to com-
plete enumeration/de-enumeration may take a long
time (> 100ms).
I2C Control (I2C_SEL = High)
The MAX14500–MAX14503 feature I2C control that
allows access to internal registers for complete control
over configuration, SD port analog switches, interrupts,
clock configuration, advanced power-on states, and
error status. I2C control uses I2C to serially program the
MAX14500–MAX14503 to be in Card Reader or Pass
Thru mode, and allows either SD card to be connected
in Card Reader mode. While a SD card is connected in
Card Reader mode, the other SD port analog switches
can be independently controlled serially through I2C.
Using the I2C bus to put the device to sleep minimizes
the supply current while maintaining control over the
SD port switches.
PASS THRU
REQUEST
TO ENTER CARD
READER
REQUEST
TO SLEEP OR
PASS THRU
IF AWAKE
IF ASLEEP
NO SD COMMAND IN PROGRESS
SD COMMAND
IN PROGRESS
DISCONNECT SD
SWITCHES FOR CARD READER
ENUMERATE SD CARD
OPEN USB SWITCHES
CARD READER
(TRANSFER DATA)
DEENUMERATE PC
CLOSE USB SWITCHES
DEENUMERATE SD CARD
RESTORE SD SWITCHES TO I2C SETTINGS
DEASSERT BUSY
CLEAR BUSY FLAG
ASSERT BUSY
SET BUSY FLAG
ENUMERATE PC
Figure 9. Card Reader Flow Chart
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX14502EVKIT+ 功能描述:界面開(kāi)發(fā)工具 MAX14502 Eval Kit RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類(lèi)型:RS-485 工具用于評(píng)估:ADM3485E 接口類(lèi)型:RS-485 工作電源電壓:3.3 V
MAX14503AEWN+ 制造商:Maxim Integrated Products 功能描述:
MAX14503ETL+ 制造商:Maxim Integrated Products 功能描述:
MAX14504EWC+T 功能描述:模擬開(kāi)關(guān) IC Dual SPDT Neg Rail w/ +/-VCC Cap RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)數(shù)量:2 開(kāi)關(guān)配置:SPDT 開(kāi)啟電阻（最大值）:0.1 Ohms 切換電壓（最大）: 開(kāi)啟時(shí)間（最大值）: 關(guān)閉時(shí)間（最大值）: 工作電源電壓:2.7 V to 4.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-16
MAX14505AEWC+ 制造商:Maxim Integrated Products 功能描述:DUAL SPDT NEGATIVE RAIL ANALOG SWIT - Rail/Tube
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