Warning:
Linx radio frequency ("RF") products may be used to
control machinery or devices remotely, including machinery or devices
that can cause death, bodily injuries, and/or property damage if
improperly or inadvertently triggered, particularly in industrial settings or
other applications implicating life-safety concerns. No Linx Technologies
product is intended for use in any application without redundancies
where the safety of life or property is at risk.
The customers and users of devices and machinery controlled with
RF products must understand and must use all appropriate safety
procedures in connection with the devices, including without limitation,
using appropriate safety procedures to prevent inadvertent triggering by
the user of the device and using appropriate security codes to prevent
triggering of the remote controlled machine or device by users of other
remote controllers.
Do not use this or any Linx product to trigger an action directly
from the data line or RSSI lines without a protocol or encoder/
decoder to validate the data.
Without validation, any signal from
another unrelated transmitter in the environment received by the module
could inadvertently trigger the action.
All RF products are susceptible to RF interference that can prevent
communication.
RF products without frequency agility or hopping
implemented are more subject to interference. This module does have
a frequency hopping protocol built in, but the developer should still be
aware of the risk of interference.
Do not use any Linx product over the limits in this data guide.
Excessive voltage or extended operation at the maximum voltage could
cause product failure. Exceeding the reflow temperature profile could
cause product failure which is not immediately evident.
Do not make any physical or electrical modifications to any Linx
product.
This will void the warranty and regulatory and UL certifications
and may cause product failure which is not immediately evident.
!
Table of Contents
1
Description
2
Ordering Information
2
Electrical Specifications
3
Schematic Diagram
4
Pin Assignments
5
Pin Descriptions
6
PCB Footprint
6
PCB Footprint
6
Board Layout Guidelines
7
Helpful Application Notes from Linx
7
Power Supply Requirements
8
Interference Considerations
9
Usage Guidelines for FCC Compliance
9
Additional Testing Requirements
10
Module Modification
10
Information to the User
11
Product Labeling
11
Antenna Selection
EVM-915-025
Data Guide
Description
The EVM-915-025 features the 25 Series
transceiver module in a FCC modular
approved solution. It is designed to greatly
simplify implementation of the 25 Series
module into a working design without the
complications of FCC testing.
The 25 Series RF transceiver module is
Figure 1: EVM-915-025 Module
designed for reliable bi-directional transfer
of digital data over distances of up to 1 mile (1.6km) line of sight. It
implements a Frequency Hopping Spread Spectrum (FHSS) protocol along
with networking and assured delivery features. The module automatically
handles all radio functions resulting in a UART-to-antenna wireless link.
The module has a Universal Asynchronous Receiver Transmitter (UART)
serial interface that can be directly connected to microcontrollers, RS-232
converters or USB adaptors. All configuration settings and data are
accessed through the UART interface.
Features
•
FCC Certified
•
True UART to antenna solution
•
Frequency Hopping (FHSS)
•
Includes robust protocol (CSMA,
assured delivery, addressing)
Applications
•
Direct RS-232/422/485 Wire
replacement
•
Automated meter reading
•
Industrial/home automation
•
Wireless sensors
•
•
•
•
•
153.6kbps max RF data rate
Low Power modes
Adjustable output power
32-bit unique address
5 volt tolerant I/O
Warning:
This product incorporates numerous static-sensitive
components. Always wear an ESD wrist strap and observe proper ESD
handling procedures when working with this device. Failure to observe
this precaution may result in module damage or failure.
•
•
•
•
•
–
1
–
Remote data logging
Fleet management
Traffic and display signs
Mass-transit communications
Oil and gas sensing
Revised 6/20/13
Ordering Information
Ordering Information
Link Part No.
EVM-915-025-FCR
Description
TRM-915-R25 Evaluation Module,
915MHz, Right Angle RP-SMA
Connector, FCC Approved
TRM-915-R25 Evaluation Module,
915MHz, Straight RP-SMA Connec-
tor, FCC Approved
Radiotronix Part No.
Wi.232FHSS-25-FCC-RA-R
Schematic Diagram
VCC
R1
1K
VCC
R2
1K
JP3
VCC
GND
1
2
3
4
EVM-915-025-FCS
Wi.232FHSS-25-FCC-ST-R
MOD1
GND
GND
GND
GND
VCC
Figure 2: Ordering Information
15
16
17
18
19
Electrical Specifications
Electrical Specifications
Parameter
Power Supply
Operating Voltage
Supply Current
Receive
Transmit, Po = -2dBm
Transmit, Po = 13dBm
Digital Interface
Output
Logic Low
Logic High
Input
Logic Low
Logic High
Environmental
Operating Temperature Range
Figure 3: Electrical Specifications
–40
85
°C
V
IL
V
IH
0
0.7*V
CC
0.3*V
CC
V
CC
VDC
VDC
V
OL
V
OH
0
2.5
0.4
V
CC
VDC
VDC
V
CC
I
CC
25
35
70
mA
mA
mA
4
12
VDC
Designation
Min.
Typ.
Max.
Units
Notes
GND
GND
GND
GND
VCC
GND
1
GND
EX
2
EX
GND
ANT
GND
RESET
C2D
RSSI
CMD_RSP
CTS
TXD
RXD
CMD
BE
14
13
12
11
10
9
8
7
6
5
4
3
GND
GND
J1
RSSI
CMD_RSP
CTS
TXD
RXD
CMD
BE
GND
JP1
12
11
10
9
8
7
6
5
4
3
2
1
JP2
12
11
10
9
8
7
6
5
4
3
2
1
GND
EX
RSSI
CMD_RSP
BE
CMD
CTS
TXD
RXD
VIN
GND
U1
VIN
1
IN
OUT
3
VCC
+
C1
C2
GND
GND
2
Note:
Please see the TRM-915-R25 data guide for complete information
about the module, detailed specifications and configuration commands.
T
3.3V
GND
GND
GNDGND
Figure 4: 25 Series EVM Module Schematic
–
2
–
–
3
–
Pin Assignments
1
2
3
4
5
6
7
8
9
10
11
12
Figure 5: 25 Series EVM Module Pin Assignments (Top View)
Pin Descriptions
Pin Descriptions
24
23
22
21
20
19
18
17
16
15
14
13
Pin Number
1
2
Name
VCC
RXD
I/O
—
I
Description
Supply Voltage
UART Receive Data Input. This is the input
line for the configuration commands as well
as data to be sent over the air.
UART Transmit Data Output. This is the
output line for the configuration command
responses as well as the data received over
the air.
UART Clear To Send, active low. This line
indicates to the host microcontroller when
the module is ready to accept data. When
CTS is high, the module is busy. When CTS
is low, the module is ready for data.
Command Input. This line sets the serial
data as either command data to configure
the module or packet data to be sent over
the air. Pull low for command data; pull high
for packet data.
No Electrical Connection. Do not connect
any traces to these lines.
Ground
Exception Output. A mask can be set to
take this line high when an exception oc-
curs. The line is lowered when the exception
register is read (regEXCEPTION)
This line outputs an analog voltage that is
proportional to the strength of the incoming
signal.
Command Response. This line is low when
the data on the TXD line is a response to a
command and not data received over the
air.
Buffer Empty. This line goes high when the
UART input buffer is empty, indicating that
all data has been transmitted.
3
TXD
O
4
CTS
O
5
CMD
I
6, 7, 8, 9, 10,
15, 16, 17, 18
11, 12, 13,
14, 23, 24
19
NC
GND
—
—
EX
O
20
RSSI
O
21
CMD_RSP
O
22
BE
O
Figure 6: 25 Series EVM Module Pin Descriptions
–
4
–
–
5
–
京公网安备 11010802033920号
EEWORLD
