CN201569945U

CN201569945U - Palm PDA based on an ARM9

Info

Publication number: CN201569945U
Application number: CN2009203169976U
Authority: CN
Inventors: 孙增增
Original assignee: Xian University of Technology
Current assignee: Xian University of Technology
Priority date: 2009-12-10
Filing date: 2009-12-10
Publication date: 2010-09-01
Anticipated expiration: 2019-12-10

Abstract

The utility model discloses a palm PDA based on an ARM9, which comprises a power supply, a S3C2440 chip, a memory and a power supply detection reset circuit; a camera controller is integrated on the S3C2440 chip; an input terminal of the camera controller is connected with an input terminal of a camera interface; an output terminal of a keying circuit is connected with an input terminal of the S3C2440 chip; an input terminal of an I2S audio-frequency interface is connected with an output terminal of the S3C2440 chip; an output terminal of an ADC convertor is connected with the output terminal of the S3C2440 chip; an input terminal of an LCD (liquid crystal display) interface is connected with the input terminal of the S3C2440 chip; and an input terminal of the memory is connected with the input terminal of the S3C2440 chip. The utility model supports more USB devices and USB-Slave drivers, and has powerful multimedia functions.

Description

Palm PDA based on ARM9

Technical field

The utility model belongs to the portable computer technical field, is specifically related to a kind of palm PDA based on ARM9.

Background technology

PDA generally is meant palm PC, with respect to traditional computer, the advantage of PDA be light, small and exquisite, mobility is strong, does not simultaneously lose the powerful of function again, shortcoming is that screen is too small, and the battery flying power is limited.PDA adopts writing pencil as input equipment usually, and storage card is as exterior storage medium.Aspect wireless transmission, most of PDA have infrared and blue tooth interface, to guarantee the convenience of wireless transmission.Many PDA can also possess Wi-Fi and connect and the GPS Global Positioning System (GPS).In the market, most popular Orion platform has PalmOS and the Windows Mobile of Microsoft series respectively.But existing P DA can not support more USB device and USB Slave to drive, and multimedia function is powerful inadequately.

Summary of the invention

The purpose of this utility model provides a kind of palm PDA based on ARM9, has solved in the prior art PDA and can not support more USB device and USB Slave to drive the problem that multimedia function is powerful inadequately.

The technical scheme that the utility model adopted is: a kind of palm PDA based on ARM9 comprises that power supply, S3C2440 chip, storer and power supply detect reset circuit; Be integrated with the camera controller on the S3C2440 chip; The input end of camera controller is connected with the input end of utilizing camera interface, and the output terminal of key circuit is connected with the input end of S3C2440 chip; I ²The input end of S audio interface is connected with the output terminal of S3C2440 chip; The output terminal of ADC converter is connected with the input end of S3C2440 chip; The input end of LCD LCDs interface is connected with the input end of S3C2440 chip; The input end of reservoir is connected with the input end of S3C2440 chip; The output terminal of power supply monitoring reset circuit is connected with the input end of S3C2440 chip; The input end of RS232 serial ports, Ethernet interface and USB interface is connected with the input end of S3C2440 chip respectively; Power supply is connected with S3C2440 chip, storer and power supply monitoring reset circuit respectively by mu balanced circuit, for it provides power supply.

The beneficial effects of the utility model are, support more USB device and USB Slave to drive, webcam driver, camera application programs under the control desk, can be by the camera of access to netwoks development board, and the image that camera obtains is presented on the LCD, cooperate the USB camera can realize network monitoring.And multimedia function is powerful.

Description of drawings

Fig. 1 is a fundamental diagram of the present utility model;

Fig. 2 is that power supply 5 of the present utility model detects reset circuit figure;

Fig. 3 is serial port circuit figure of the present utility model;

Fig. 4 is usb 14 circuit diagrams of the present utility model;

Fig. 5 is the utility model Ethernet interface 15 circuit diagrams;

Among the figure, 1.S3C2440 chip, 2. storer, 3. power supply monitoring reset circuit, 4. mu balanced circuit, 5. power supply, 6.LCD LCDs interface, 7.ADC converter, 8.I ²The S audio interface, 9. key circuit, 10. utilizing camera interface, 11. camera controllers, 12. digital camera heads, 13.RS232 serial ports, 14.USB interface, 15. Ethernet interfaces.

Embodiment

Below in conjunction with the drawings and specific embodiments the utility model is elaborated.

As shown in Figure 1: the utility model discloses a kind of palm PDA, comprise that power supply 5, S3C2440 chip 1, storer 2 and power supply detect reset circuit 3 based on ARM9; Be integrated with camera controller 11 on the S3C2440 chip 1; The input end of camera controller 11 is connected with the input end of utilizing camera interface 10, and the output terminal of key circuit 9 is connected with the input end of S3C2440 chip 1; I ²The input end of S audio interface 8 is connected with the output terminal of S3C2440 chip 1; The output terminal of ADC converter 7 is connected with the input end of S3C2440 chip 1; The input end of LCD LCDs interface 6 is connected with the input end of S3C2440 chip 1; The input end of storer 2 is connected with the input end of S3C2440 chip 1; The output terminal of power supply monitoring reset circuit 3 is connected with the input end of S3C2440 chip 1; The input end of RS232 serial ports 13, Ethernet interface 15 and usb 14 is connected with the input end of S3C2440 chip 1 respectively; Power supply 5 is connected with S3C2440 chip 1, storer 2 and power supply monitoring reset circuit 3 respectively by mu balanced circuit 4, for it provides power supply.

Power supply 5 circuit of the present utility model: through providing 3.3V power supply 5 with the low pressure difference linearity source of stable pressure AS2815AR chip voltage stabilizing of carrying 1.5A.Core adopts low noise MAX8860 voltage stabilizing (1.25V).

As shown in Figure 2,, choose the special system monitoring chip MAX811 that resets, realize monitoring and hand-reset operation power supply 5 voltages for power supply 5 supervisory function bits efficiently are provided.In case system power supply 5 voltages are lower than system reset threshold value (2.93V), 811 can reset to system from 2 pin output high level.By SW2 3 pin level are dragged down also and can carry out hand-reset to system from 2 pin output high level.

As shown in Figure 3, finish serial communication between CPU and the computer by level transferring chip SP3232.RSRTS0, RSCTS0 must get handshake with compunlcation institute.If will transmit data to PDA from computer, at first the computer expert crosses RSRTS0, RSCTS0 and PDA shakes hands, and after the success, carries out serial input data by RSRXD0, and then shake hands through handshake nRTS0, nCTS0 and ARM9, data input is carried out by TXD0 in the back of shaking hands.If it is then opposite to pass data from PDA toward computer.

As shown in Figure 4, USB module that S3C2440 is inner integrated is directly utilized wherein USB module, expands a HOST and DEVICE mouth.The D+ of USB_DEVICE, D-signal pins connect DP1, the DN1 pin of ARM9, and the USB_EN signal is used to enable USB_DEVICE.The D+ of USB_HOST, D-signal pins connect DP0, the DN0 pin of ARM9.

As shown in Figure 5, itself does not have network interface S3C2440, by the network interface of a 100M of DM9000E expansion.DM9000 is a fully-integrated and meet cost benefit single-chip Fast Ethernet mac controller and general Processing Interface, the SRAM of adaptive PHY of 10/100M and 4KDWORD value.Its purpose is the support tolerance at the 3.3V and the 5V of low-power consumption and high-performance process.DM9000 supports 8, and 16 and 32-position interface accessing internal storage 2 are to support different processors.DM9000 physical layer protocol layer interface supports to use 5 class unshielded twisted pairs under 3 classes under the 10MBps, 4 classes, 5 class unshielded twisted pairs and the 100MBps fully.This is to meet IEEE 802.3u specification fully.Its automatic synchronization function will be finished automatically and be configured to be fit to greatest extent its line bandwidth.Also support the flow control of IEEE 802.3x full duplex.This work the inside DM9000 is very simple, so the user can be easy to transplant the port drivers under any system.SD0-SD15 is address, data multiplex pin, by CMD pin decision current accessed type.

In addition, system interface bus has 8 address buss, 16 single data buses, 4 interruptions, 4 signals such as choosing, this bus interface the is integrated required leading point of IDE.The LCD LCD Interface adopts 50 pin 2.00MM spacings, can connect various monochromes, pseudo-color, very color display screen, the band touch screen interface.

Claims

1. the palm PDA based on ARM9 is characterized in that: comprise that power supply (5), S3C2440 chip (1), storer (2) and power supply detect reset circuit (3); Be integrated with camera controller (11) on the S3C2440 chip (1); The input end of camera controller (11) is connected with the input end of utilizing camera interface (10), and the output terminal of key circuit (9) is connected with the input end of S3C2440 chip (1); I ²The input end of S audio interface (8) is connected with the output terminal of S3C2440 chip (1); The output terminal of ADC converter (7) is connected with the input end of S3C2440 chip (1); The input end of LCD LCDs interface (6) is connected with the input end of S3C2440 chip (1); The input end of storer (2) is connected with the input end of S3C2440 chip (1); The output terminal of power supply monitoring reset circuit (3) is connected with the input end of S3C2440 chip (1); The input end of RS232 serial ports (13), Ethernet interface (15) and USB interface (14) is connected with the input end of S3C2440 chip (1) respectively; Power supply (5) is connected with S3C2440 chip (1), storer (2) and power supply monitoring reset circuit (3) respectively by mu balanced circuit (4), for it provides power supply.