ER400RS EASY RADIO, ER400RS Datasheet - Page 7

MODULE, RX, FM, 433MHZ

ER400RS

Manufacturer Part Number
ER400RS
Description
MODULE, RX, FM, 433MHZ
Manufacturer
EASY RADIO
Datasheet

Specifications of ER400RS

External Depth
4mm
External Length / Height
14mm
External Width
37mm
Frequency
433MHz
Operating Temperature Max
65°C
Operating Temperature Min
-20°C
Rf Sensitivity
-105dBm
Range
250m
Pin Description
Checklist
Application & Operation ER400TRS
Figure 9 shows a typical system block diagram comprising hosts (user’s application) connected to Easy-
Radio Transceivers. The hosts (A & B) will be monitoring (collecting data) and/or controlling (sending data) to
some real world application.
The hosts provide serial data input and output lines and two ‘handshaking’ lines that control the flow of data
to and from the Easy-Radio Transceivers. The ‘Busy’ output line, when active, indicates that the transceiver
is undertaking an internal task and is not ready to receive serial data. The ‘Host Ready’ input is used to
indicate that the host is ready to receive the data held in the buffer of the Easy-Radio Transceiver.
LPRS Data Sheet
Pin
No
1
2
3
4
5
6
7
8
9
Easy -Radio ER400TS, ER400RS & ER400TRS 1-1.doc
1. The module operates internally from an on board 3.3 Volt low drop regulator. The logic levels of the
2. The serial inputs and outputs are intended for connection to a UART or similar low voltage logic
3. The ‘Host Ready Input’ should be tied to 0 Volt (Ground) if not used.
4. The ‘Serial Data In’ should be tied to Vcc if not used. (Receive mode only).
5. Outputs will drive logic operating at 5 Volts and inputs will be correctly driven by logic operating at 5
input/output pins are therefore between 0 Volt and 3.3 Volts. (See specifications/performance data).
device. Do not connect any of the inputs or outputs directly to an RS232 port. The transceiver
module may be permanently damaged by the voltages (+/- 12V) present on RS232 signal lines. See
Application Circuit (Figure 11) for typical connection to an RS232 port via MAX232 interface IC.
Volts (CMOS & TTL logic levels).
Name
Antenna
RF Ground
RSSI
Busy Output
Serial Data Out
Serial Data In
Host Ready
Input
Vcc
Ground
Host
(A)
Serial Data Output
Serial Data Input
Host Ready
Busy
Easy -Radio ER400TS Transmitter, ER400RS Receiver & ER400TRS Transceiver
Description
50 Ohm RF input/output. Connect to suitable antenna.
RF ground. Connect to antenna ground (coaxial cable screen
braid) and local ground plane. Internally connected to other
Ground pins.
Received Signal Strength Indication
Digital Output to indicate that transceiver is ready to receive
serial data from host.
Digital output for received data to host
Digital input for serial data to be transmitted
Digital Input to indicate that Host is Ready to receive serial
data from transceiver
Positive supply pin. +3.6 to +5.5 Volts. This should be a
‘clean’ noise free supply with less than 25mV of ripple.
Connect to supply 0 Volt and ground plane
Figure 9 Typical System Block Diagram
Transceiver
Easy-Radio
(A)
RF Link
Copyright LPRS 2003. March2004
Transceiver
Easy-Radio
(B)
Serial Data Output
Serial Data Input
Host Ready
Busy
Notes
See Note
See Note
CTS function
RTS function
Host
(B)
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