Texas Instruments RS-485 Half-Duplex Evaluation Module RS485-HF-DPLX-EVM RS485-HF-DPLX-EVM 데이터 시트
제품 코드
RS485-HF-DPLX-EVM
NOTE: R2, R3, R4 - DNI
A_2
B_2
DE
D
B
/RE
R_1
R
A
DUT_VCC
EARTH_GND
DUT_GND
DUT_GND
EARTH_GND
DUT_GND
EARTH_GND
EARTH_GND
EARTH_GND
EARTH_GND
DUT_GND
DUT_VCC
DUT_GND
DUT_GND
EARTH_GND
DUT_GND
EARTH_GND
DUT_GND
EARTH_GND
DUT_VCC
DUT_VCC
DUT_VCC
DUT_VCC
VCM_B
VCM_A
DUT_GND
EARTH_GND
DUT_VCC
VCM_B
DUT_GND
EARTH_GND
EARTH_GND
DUT_GND
EARTH_GND
DUT_VCC
VCM_A
DUT_GND
VCM_A
VCM_B
EARTH_GND
EARTH_GND
EARTH_GND
EARTH_GND
EARTH_GND
EARTH_GND
EARTH_GND
EARTH_GND
DUT_GND
DUT_GND
DUT_VCC
DUT_GND
DUT_GND
DUT_GND
DUT_GND
DUT_GND
R7
UNINSTALLED
UNINSTALLED
TB2
3PIN_TERMINAL_BLOCK
1
2
3
R2
50 Ohms
50 Ohms
R3
50 Ohms
50 Ohms
D3
RED LED Diode
1
2
D2
GREEN LED Diode
GREEN LED Diode
1
2
R4
50 Ohms
50 Ohms
C1
1uF
1uF
R5
120 Ohm
120 Ohm
JMP9
Header 4x1
1
2
3
4
2
3
4
U1
SN65HVD7x
R
1
/RE
2
DE
3
D
4
GND
5
A
6
B
7
VCC
8
R11
1k Ohms
1k Ohms
C6
UNINSTALLED
UNINSTALLED
C2
0.1uF
0.1uF
JMP12
Header 3x1
1
2
3
JMP14
Header 3x1
1
2
3
JMP4
Header 4x1
1
2
3
4
2
3
4
C4
1uF
1uF
C9
UNINSTALLED
JMP10
Header 4x1
1
2
3
4
2
3
4
C3
0.01uF
JMP2
Header 4x1
1
2
3
4
2
3
4
JMP8
Header 4x1
1
2
3
4
2
3
4
JMP3
Header 4x1
1
2
3
4
2
3
4
R6
UNINSTALLED
UNINSTALLED
C7
UNINSTALLED
UNINSTALLED
D1
BLUE LED Diode
1
2
C5
0.1uF
0.1uF
R14
1k Ohms
1k Ohms
JMP7
Header 4x1
1
2
3
4
2
3
4
R1
1k Ohms
JMP13
Header 3x1
1
2
3
JMP1
Header 4x1
1
2
3
4
2
3
4
JMP6
Header 4x1
1
2
3
4
2
3
4
TB1
3PIN_TERMINAL_BLOCK
1
2
3
JMP11
Header 3x1
1
2
3
R9
0 Ohm
C8
UNINSTALLED
R8
0 Ohm
R10
0 Ohm
EVM Setup and Precautions
2
EVM Setup and Precautions
shows the schematic of the EVM. The EVM board has headers labeled from JMP1 to JMP14
(JMP5 is omitted) and two 3-pin terminal blocks labeled TB1 and TB2. These headers support device
evaluation for a wide range of system configurations.
evaluation for a wide range of system configurations.
NOTE:
The examples in this document show a 3.3-V signal generator and a 3.3-V power supply
unit. Depending on the Texas Instruments RS-485 device chosen, the user may need to
provide a 5-V signal generator input and 5-V power supply.
provide a 5-V signal generator input and 5-V power supply.
•
Pin 1 (EARTH) is a second ground pin that allows applying an external voltage between GND and
EARTH to simulate common-mode voltage conditions.
EARTH to simulate common-mode voltage conditions.
•
Pin 2 (GND) is connected to the negative output or ground terminal of the PSU. This pin represents the
ground potential of the device-under-test and the entire EVM. It also connects to various jumpers on
the board.
ground potential of the device-under-test and the entire EVM. It also connects to various jumpers on
the board.
•
Pin 3 (VCC) is connected to the positive output of a regulated power supply unit (PSU) as it represents
the positive supply voltage of the device-under-test and also connects to various jumpers on the board.
the positive supply voltage of the device-under-test and also connects to various jumpers on the board.
Figure 2. RS-485 Half-Duplex EVM Schematic
3
SLLU173B – October 2012 – Revised June 2013
RS-485 Half-Duplex Evaluation Module
Copyright © 2012–2013, Texas Instruments Incorporated