最小系统原理图

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U1 h 3 5 10 1 2 4 7 11 P0.7 P0.6 P0.5 P0.4 P0.3 P0.2 P0.1 P0.0

+5

CON1 2 4 6 8 10 ISP 1 3 5 7 9 MOSI RESET SCK MISO

C9 U4

20P

A

四位级连共阳数码管

g f e d c b a 1 2 3 4

ISP下载接口功能: AT89 89S功能:给AT89S单片机下载程序 R7 10K R8 10K R9 10K

+5 R6 10K P2.4

USB转串口电路功能1 STC单片机下载程序电路功能1:STC单片机下载程序电路功能2 USB口供电与通信功能2:USB口供电与通信

P3.0 1 2 3 4 P3.1 5 6 7 8 9 10 11 12 13 14

TXD DTR RTS VDD RXD RI_N GND NC DSR_N DCD_N CTS_N SHTD E_CLK E_DA PL2303

OSC2 OSC1 PLL_TE GND_A NC LD_M TRI_S GND VCC NC GND V03.3 DM(D-) DP(D+)

28 27 26 25 24 23 22 21 20 19 18 17 16 15

Y1 C10 12M

20P A

C4 0.1uF

12

LED4

R2 200

R3

R4

R5

S1 P2.5 S2 J1+5 JMP Q1 R12 1 P2.3 560 P2.6 S3 P2.7 S4 R14 P2.2 P3.6 J9 4.7K+5 Q7 8550 LS1 2

四个独立按键 U8 GND D+ DVCC USB VCC 4 3 2 1

R25 R26 27 27

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8

200 200 200

2

P2.0

R13 560

Q2

1

6 3906 3

3906 3

C14 100uF

C8 2K R27 0.1uF B

B 2 2 Q4 3906 3 P2.1 R15 1 560 3906 3 Q3 1 560

JMP R30

蜂鸣器

+5 D1 D2 D3 D4 D5 D6 D7 D8

温度DS18B温度DS18B20 DS18红外 1838一体化接收 +5 C R10 10K

C2 0.1uF P3.3

OUT VDD GND

+5

U5

R1+5 C3 10K U3 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 VSS VDD VO RS R/W E DB0 DB1 DB2 DB3 DB4 DB5 DB6 DB7 PSB NC RST VOUT LEDK LEDA 12864 JP1 1 3 5 7 9 11 13 15 H3 1 2 3 4 5 6 7 8 H8 H4 1 2 3 4 5 6 7 8 H8 P0.0 P0.1 P0.2 P0.3 P0.4 P0.5 P0.6 P0.7 20P P3.0 P3.1 P3.2 P3.3 P3.4 P3.5 P3.6 P3.7+5 C5 S6 0.1uF R11 10K 20P 2 4 6 8 10 12 14 16 P1.0 P1.1 P1.2 P1.3 P1.4 MOSI MISO SCK P3.3 P3.2 P3.1 P3.0 1 2 3 4 5 6 7 8 13 12 11 10 RESET 9 U7 P1.0 P1.1 P1.2 P1.3 P1.4 P1.5(MOSI) P1.6(MISO) P1.7(SCK) P3.3(INT1) P3.2(INT0) (TXD)P3.1 (RXD)P3.0 RST VCC EA/VPP (AD0)P0.0 (AD1)P0.1 (AD2)P0.2 (AD3)P0.3 (AD4)P0.4 (AD5)P0.5 (AD6)P0.6 (AD7)P0.7 P3.4(T0) P3.5(T1) P3.6(WR) P3.7(RD) ALE/PROG PSEN (A8)P2.0 (A9)P2.1 (A10)P2.2 (A11)P2.3 (A12)P2.4 (A13)P2.5 (A14)P2.6 (A15)P2.7 40 31 39 38 37 36 35 34 33 32 14 15 16 17 30 29 21 22 23 24 25 26 27 28 0.1uF+5 JP2 P0.0 P0.1 P0.2 P0.3 P0.4 P0.5 P0.6 P0.7 P3.4 P3.5 P3.6 P3.7 P2.0 P2.1 P2.2 P2.3 P2.4 P2.5 P2.6 P2.7 1 2 3 4 5 6 7 8 9 Header 9 C+5+5 C1 0.1uF VCC 3 LC D1602 U2 VSS VDD VO RS R/W E DB0 DB1 DB2 DB3 DB4 DB5 DB6 DB7 BLK BLA 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

U6 P3.7 2 1 DQ GND DS1820

3 2 1

+5

JK1 VCC 3 GND 2 1 GND Jack

P2.3 P2.4 P2.5 P0.0 P0.1 P0.2 P0.3 P0.4 P0.5 P0.6 P0.7+5+5 P2.6

LC D12864

R22 510 R23 510 R21 510 R17 510 R18 510 R19 510 R20 510 R24 510

SFH506-38

单片机小系统部分包括：晶振，复位，包括：晶振，复位，P0口接上接电阻口接LED LED显示用STC12C 60S STC12 P1口接LED显示用STC 12C5A60S2可作为AD AD输入口可作为AD输入口

Header 8X2

2 S5 C6 0.1uF C13 100uF 1 VCC 3 5 4 6 SW-DPDT-6 0.1uF C7

+5

LCD1602 DS1 R16 560

H2 1 2 3 4 5 6 7 8 H8 D

C11 Y2 C12 6M

19 18 20

XTAL1 XTAL2 GND AT89S51

D

电源接口输入开关电路 1 2

1

2864与 1602显示接口带对比度调节 1602显示接口带对比度调节

Title Size A3 Date: File: 2011-10-11 E:\单单单\..\小小小小小小.SCH Sheet of Drawn By: 6 Number Revision

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