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參數(shù)資料
| 型號： | MAX14502AETL+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 10/41頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CARD READER USB-SD 40-TQFN |
| 產品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 2,500 |
| 應用： | 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 |
| 供應商設備封裝： | 40-TQFN-EP（5x5） |
| 包裝： | 帶卷 (TR) |
| 安裝類型： | 表面貼裝 |
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MAX14500–MAX14503
Hi-Speed USB-to-SD Card
Readers with Bypass
18
______________________________________________________________________________________
Detailed Description
The MAX14500–MAX14503 can be added to devices
that have an SD card slot and a USB full-speed port
(12Mbps) to provide a Hi-Speed USB path to an SD
card bypassing the host microprocessor (P), allowing
for faster SD card transfers (Figures 1–4). Without the
MAX14500–MAX14503, a host P with a full-speed USB
port moves data between an SD card and a host PC at
12Mbps when transferring data from an SD card
through USB. The host P has additional overhead
because it has to accept data from the SD cards,
process the data by putting it in USB format, and then
transfer the data through the USB port. The MAX14500–
MAX14503 create an alternate path from the SD card to
USB, providing USB Hi-Speed capability. By bypassing
the host P using the MAX14500–MAX14503, SD card
read and write operations are not limited by host P
overhead and USB full-speed data rates.
The MAX14500–MAX14503 operate in Pass Thru and
Card Reader mode. In Pass Thru mode, the MAX14500–
MAX14503 are transparent to the host P. All read and
write operations pass from the host P SD port to the SD
card without modification. All of the features of the original
device are intact and there is no need to change firmware
in the host P. In Card Reader mode, the SD card is con-
nected to the PC with the internal USB Hi-Speed card
reader, bypassing the host P.
The MAX14500–MAX14503 can be controlled in two
ways. The simple control method uses a single output
from a P or ASIC to select Pass Thru or Card Reader
mode. Only one SD card can be used as a Hi-Speed
USB card reader in simple control. I2C control allows
more configuration options and provides status informa-
tion along with error conditions and additional interrupts.
Two SD cards can be connected and each set of SD
port switches can be controlled independently (two SD
port version under I2C control). The state of I2C_SEL
must not change after VIO is applied.
With I2C control, the I2C bus is used to read and write to
internal registers for configuration, error checking, con-
trol, and status reporting. The control and configuration
registers have various functions including wakeup, SD
card selection, interrupt enable, and SD switch settings.
The status registers give the status of errors, SD card
detection, power supplies, and interrupts. Putting the
MAX14500–MAX14503 to sleep puts the device into
Pass Thru mode. The state of SD port switches for card 1
and card 2 can be changed while in Pass Thru. Some
I2C commands are executed upon waking up or entering
Card Reader mode. For register settings that involve
Card Reader mode, (when in Sleep mode), program-
ming the I2C registers changes the values, but the
actions do not execute until the internal logic wakes up
or Card Reader mode is entered. The register map indi-
cates when register bit changes take effect.
SDA
SCL
tHD,STA
tLOW_I2C
tHIGH_I2C
tR_I2C
tF_I2C
tSU,DAT
tSU,STA
tSU,STO
tBUF
tHD,STA
tHD,DAT
START
CONDITION
STOP
CONDITION
START
CONDITION
REPEATED
START CONDITION
tF_I2C
tR_I2C
Figure 6. I2C Timing Diagram
Timing Diagrams (continued)
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX14502EVKIT+ | 功能描述:界面開發(fā)工具 MAX14502 Eval Kit RoHS:否 制造商:Bourns 產品:Evaluation Boards 類型:RS-485 工具用于評估:ADM3485E 接口類型: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:模擬開關 IC Dual SPDT Neg Rail w/ +/-VCC Cap RoHS:否 制造商:Texas Instruments 開關數(shù)量:2 開關配置:SPDT 開啟電阻（最大值）:0.1 Ohms 切換電壓（最大）: 開啟時間（最大值）: 關閉時間（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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