CN2489384Y - Computer keyboard with card reader - Google Patents

Abstract

A computer keyboard with a card reader comprises a keyboard circuit, a card reader circuit and a power supply control, wherein the keyboard circuit is provided with a USB interface, and a card reader socket is positioned on a keyboard body and is connected with the keyboard circuit on the circuit. The card reader circuit can be directly connected with the keyboard circuit CPU, and also can be connected with the keyboard circuit CPU through the bus transceiver, or connected with the keyboard circuit CPU through the buffer. The utility model discloses expanded the function of keyboard, provided the shortcut of user operation computer, integrated resistance-type handwriting pad function, for the user provides convenient characters input mode, the reinforcing constructs low-cost electronic commerce platform to the support of IC-card, has made up storage card USB's conversion function, the file of various storage card the inside can be visited with the mode of visiting the computer hard disk to the user.

Description

computer keyboard with card reader

technical field

The utility model relates to an expansion of a computer keyboard, in particular to a computer keyboard with a card reader, which belongs to the function expansion of computer peripherals.

Background technique

At present, "memory card" has been widely used in IA and digital devices, and the mainstream products include: CompactFlash (C/F), Multimedia Card (MMC), Smart Media Card (SMC), SecurityDisk (SD), IBM Micro-Drive (MD), Memory Stick (MS), etc. Although C/F is compatible with MD interface and MMC is compatible with SD interface, most of the products do not have a unified interface when exchanging data with PC, causing users to use different interfaces. The product must be connected to the computer with various connections, and its transmission speed is limited, which also causes inconvenience to the user.

In addition, the transmission interfaces of devices such as handheld devices or digital cameras include: serial port, parallel port, USB1.1, IEEE1394, etc., with different transmission speeds and different transmission modes.

In addition, many data mobile storages also have different interfaces.

Now there are only single card readers on the market, some of which are multi-in-one readers and some of which are single SLOT readers.

Contents of the invention

The first purpose of the utility model is to provide a computer keyboard with a card reader, which supports the IC card reading function and supports all CPU cards and memory cards conforming to the IS07816 specification.

The second purpose of the utility model is to provide a computer keyboard with a card reader, which provides a transfer function from various memory cards to the USB protocol, transfers the memory card into a standard USB large-capacity storage device, and is compatible with the USB protocol on the market. Various mainstream memory cards.

The third purpose of the utility model is to provide a computer keyboard with a card reader, which supports the function of a resistive handwriting board in addition to various functions of the integrated keyboard.

The fourth purpose of the utility model is to provide a computer keyboard with a card reader, which provides a communication interface between various IA and digital product memory cards and PC, and improves the communication speed between various IA and digital products and PC.

The purpose of this utility model is achieved in that:

A computer keyboard with a card reader is characterized in that it includes a keyboard circuit, a card reader circuit, and a power supply control, wherein the keyboard circuit itself is designed with a USB interface, and the card reader socket is located on the keyboard body, and is connected with the keyboard circuit on the circuit. connected.

The card reader circuit interface is a (CF) card interface with storage function itself, and its circuit interface is directly connected with the keyboard circuit CPU. The card reader is connected to the keyboard circuit through two pins of USB-DP and DM.

Insert the CF card, MMC card, and SMC card into the card reader.

For the memory card (CF) with data storage function, the keyboard chip uses the address line to control the address gating, read and write operations of the CF card in the card reader and detect the operating status of the card, and uses the data line to transmit parallel data.

For the memory card (MMC) of the serial data transmission format, the data buffer is used for data buffering. The card reader circuit interface is a serial data transmission card interface, which is connected to the keyboard circuit CPU through the bus transceiver.

As for the memory card (SMC) of the parallel data transfer format, the data latch is used for latching. The card reader circuit interface is a parallel data transmission card interface, and is connected to the keyboard circuit CPU through the buffer.

The card reader socket can be arranged on the side of the keyboard body.

There are more than one card reader sockets.

The technical effect of the utility model is as follows:

It expands the functions of the keyboard, provides shortcuts for users to operate computers, integrates the functions of resistive handwriting boards, provides users with convenient text input methods, enhances the support for IC cards, and builds a low-cost e-commerce platform. With the conversion function, the user can access the files in various memory cards by accessing the hard disk of the computer.

In addition, the modular design makes it possible to integrate modules in the future and make dedicated chips to reduce costs.

Description of drawings

Fig. 1 position diagram of the card reader of the present utility model;

Fig. 2 overall block diagram of the utility model;

Fig. 3 circuit schematic diagram one of the utility model;

Fig. 4 circuit schematic diagram two of the utility model;

Fig. 5 circuit schematic diagram three of the utility model;

Fig. 6 schematic diagram four of the utility model circuit;

Fig. 7 is the utility model circuit schematic diagram five.

In the figure,

U1--AT24C08 EEPROM, used to store the PID and VID of the device

U2--the first part of the AU94173 main IC, realizes the C/R function and performs data transmission with U3.

U3--W27C512 EPROM, used for data transmission with C/R.

U4--the second part of AU94173 main IC, realize keyboard, HUB and handwriting functions

U5--2526-2BM overcurrent protection IC provides power to the lower two HUBs and automatically detects the current. When the current is too large, the HUB power supply will be automatically cut off.

U6—the third part of AU94173 main IC, which realizes the function of five-in-one memory card.

U7, U8—74LVX245, 8bit bus transceiver, used to receive and send data, and carry out bidirectional transmission of parallel data.

U9--74VHC125 BUFFER buffer, used for data latch control.

U10--74HC126 is the same as U9

J1--USB interface, connected with the USB port of the motherboard with a USB cable.

J2--Writing board interface, four-pin socket, external conductive glass of writing board.

J3, J4--HUB interface, can be connected with low power consumption equipment.

J5--CF, MD deck

J6--SMC card holder

J7--MMC, SD card holder

JP1, JP2--jumper pin

JP3--SCARD socket C/F card

JP4, JP5--keyboard socket

Detailed ways

A slot 2 is provided around the existing standard USB keyboard 1, and a memory card 3 can be inserted into the slot 2 of the keyboard 1, as shown in FIG. 1 . The slot 2 can be arranged on the front, side, etc. of the keyboard 1 .

The utility model is a computer keyboard with a card reader, including a USB HUB main chip, a card reader, power control, etc., wherein the USB HUB main chip is a keyboard, a handwriting board, a general input and output function pin, a HUB function, The card reader five-in-one chip itself can provide two USB interfaces. In this circuit, the card reader occupies one of the USB interfaces and the other is reserved.

In the memory card, because the C/F is compatible with the MD interface, and the MMC is compatible with the SD interface, it is equivalent to only needing to design three kinds of card holders.

First, a pin of the memory card is used to detect the insertion status. The detection pins are MMC CHK, SMC CD, CF CD.

When no memory card is inserted, this pin is high.

When a memory card is detected, the pin is low. At this time, the data is read from the card and data transmission is performed.

The specific working principle is as follows:

For CF card: see Figure 4, since the CF card itself has the function of data storage, U6 uses three address lines CF-A0, A1, A2 to control the address strobe of J5, and uses CF-#RE, ST9-#WE To control the read and write operations of the CF card, use the CF-R/B pin to detect whether the operating state of the CF card is READY or BUSY, and finally use 8 data lines ST9-D0---D7 for parallel data transmission.

Workflow: CF card inserted into J5, then to U6.

For the MMC card: see Figure 5, the data transmission format is serial data transmission, the clock signal is received by MMC-CLK, and the data signal is received by the MMC-DAT pin. Due to the different transmission methods, signals and data cannot be received directly through U6, so U9 and U10 are used for data buffering.

Workflow: MMC card inserted into J6, through U7, U8 and then to U6.

For SMC card: its transmission format is parallel data transmission, U7 and U8 are used to latch and transmit control signals and parallel data signals with U6, U7 is used here as a control signal transceiver, and U8 is used as a data transceiver. The conduction of the signal is controlled by ST9-DATA-DIR from U6. When the signal is not triggered, the data will be latched. When the signal is triggered, the data will be transmitted. The data transmission method is bidirectional.

Workflow: SMC card is inserted into J7, through U9, U10 to U6.

Claims (6)

1. A computer keyboard with a card reader, characterized in that: it includes a keyboard circuit, a card reader circuit, and a power supply control, wherein the keyboard circuit itself is designed with a USB interface, and the card reader socket is located on the keyboard body. The keyboard circuit is connected. 2. The computer keyboard with a card reader as claimed in claim 1, wherein the circuit interface of the card reader is a (CF) card interface with a storage function, and the circuit interface is directly connected to the CPU of the keyboard circuit. 3. The computer keyboard with a card reader as claimed in claim 1, wherein the circuit interface of the card reader is a serial data transmission card interface, which is connected to the CPU of the keyboard circuit through a bus transceiver. 4. The computer keyboard with a card reader as claimed in claim 1, wherein the circuit interface of the card reader is a parallel data transmission card interface, which is connected to the CPU of the keyboard circuit through a buffer. 5. The computer keyboard with a card reader as claimed in claim 1, wherein the card reader socket can be arranged on the side of the keyboard body. 6. The computer keyboard with card reader according to claim 1 or 5, characterized in that there are more than one card reader sockets.

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