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参数资料
| 型号： | MAX14502AETL+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/41页 |
| 文件大小： | 0K |
| 描述： | IC CARD READER USB-SD 40-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | USB |
| 接口： | I²C，2 线串口 |
| 电源电压： | 1.8 V ~ 3.3 V |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 供应商设备封装： | 40-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
| 安装类型： | 表面贴装 |
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MAX14500–MAX14503
Hi-Speed USB-to-SD Card
Readers with Bypass
______________________________________________________________________________________
21
When the card reader is initiated in the control register,
the internal USB switch disconnects from the host P
USB port and connects to the internal USB Hi-Speed
SD card reader unit. When the MAX14500–MAX14503
disconnect from the host to implement a stand-alone
high-speed card reader, it simulates a disconnect on
the host USB and SD ports to maintain data coherence.
The SD connections are restored to the host P by clos-
ing the analog switch connecting CCRD_PRST to
HCRD_PRST.
Certain registers execute actions when entering Card
Reader mode. These actions are only valid for Card
Reader mode. Writing to these registers in Sleep mode,
or when awake, updates the registers, but the action is
carried out when Card Reader mode is activated for
one of the SD cards (see the
Register Map section).
When Card Reader mode is initially entered, the internal
microcontroller enumerates with the PC to establish a
high-speed USB mass storage device. No actions by the
host P are required for enumeration other than entering
Card Reader mode. Once the USB-SD card connection
is established, PC to SD card data transfer begins and
various interrupts monitor the status the of Card Reader
mode if enabled. The BSY flag is represented externally
by the BUSY output and can be read serially through
I2C. The BUSY output is always active. If the host P
requests Sleep mode in the middle of the data transfer,
the MAX14500–MAX14503 do not complete the transfer,
exit Card Reader mode, reconnect USB switches, and
CCLK2
CCMD2
CDAT2_[3:0]
HCLK2
HCMD2
HDAT2_[3:0]
4
SD
PORT2
SD
SLOT2
CD+
SD PORT 2 SWITCHES
HOST PROCESSOR
USB SWITCHES
CD-
D+
D-
HD+
HD-
USB
CONNECTOR
SD CARD INTERFACE
USB HS
CARD READER
CCRD_PRST
SD PORT 1 SWITCHES
CCLK1
CCMD1
HCRD_PRST
HCLK1
HCMD1
4
CDAT1_[3:0]
HDAT1_[3:0]
SD
PORT1
I/O
LEVEL
TRANSLATORS
HOST
I/O
SD
SLOT1
USB
TRANSCEIVER
MAX14500–
MAX14503
Figure 8. Card Reader Mode. The USB port is connected to SD card 1. In the 2 port version, a second SD card (SD slot 2) can be
independently connected and disconnected to the host P.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX14502EVKIT+ | 功能描述:界面开发工具 MAX14502 Eval Kit RoHS:否 制造商:Bourns 产品:Evaluation Boards 类型:RS-485 工具用于评估:ADM3485E 接口类型:RS-485 工作电源电压: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:模拟开关 IC Dual SPDT Neg Rail w/ +/-VCC Cap RoHS:否 制造商:Texas Instruments 开关数量:2 开关配置:SPDT 开启电阻（最大值）:0.1 Ohms 切换电压（最大）: 开启时间（最大值）: 关闭时间（最大值）: 工作电源电压:2.7 V to 4.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体: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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