89C51 GND
16 15 14 13 12 11 10 9 GND
460 MAX485 3 4
RO RE DE DI VCC B A GND
USB 8 7 6 5 1 VCC DD+ GND
LM139 R3 C R2 1K 100K
C6 0.5uF
LM139_1 R11 100K R12 1K GND C13 0.1uF
1
2
3
4
下位机电路
R1 A PORT 2 1 C3 0.1uF C1 0.1uF 1 VREF VCC 2 +IN DCLK 3 -IN D_OUT 4 GND CS ADS7816 GND VCC 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 GND C11 22pF VCC VCC R4 15K
+ + -
VCC 10 8 7 6 5 VCC C2 10uF GND VCC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 P1.0 VCC P1.1 P0.0(AD0) P1.2 P0.1(AD1) P1.3 P0.2(AD2) P1.4 P0.3(AD3) P1.5 P0.4(AD4) P1.6 P0.5(AD5) P1.7 P0.6(AD6) RST P0.7(AD7) P3.0(RXD) EA(VPP) P3.1(TXD) ALE(PROG) P3.2(INT0) PSEN P3.3(INT1) P2.7(A15) P3.4(T0) P2.6(A14) P3.5(T1) P2.5(A13) P3.6(WR) P2.4(A12) P3.7(RO) P2.3(A11) XTAL2 P2.2(A10) XTAL1 P2.1(A9) GND P2.0(A8) 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21
A
R9 1K
C9 0.1uF
B
VDD 460K 19.2K NC OCD ITXD IRXA ITEST0 NC INRTS ITEST1 OXTA NC NC ORXD VSS
460K
RST
C10
22pF
B
HT2012 Y1
上位机
VCC 1 2 3 4 5 6 7 8
VDD 460K 19.2K NC ODC ITXD IRXA ITEST0 NC INRTS ITEST1 OXTA NC NC ORXD VSS
Number:* Revision:*
Size: A4
Date: 2015/4/23 Time: 19:31:32 Sheet * of * File: C:\Users\huangjun\Desktop\HART 协议电路.SchDoc 1 2 3
* * * * * 4
+ -
Βιβλιοθήκη BaiduC15 0.5uF
HT2012_1
C
GND C5 0.1uF C4 0.1uF R5 1K R7 100K GND 1K R8 100K R10 15K
+ -
R15 100K R14 1K GND C12 0.1uF
R16 100K
LM R6
LM_1 R13 1K
D Title
D
HART协议电路