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The
RLC-1 RS232 to 5-Volt (CMOS/TTL) Level converter provides a simple, low-cost
and easy to use solution to interfacing a CMOS or TTL based circuit to
an RS232/EIA232 serial port.
The
RLC-1 contains an internal circuit to provide the positive and negative
voltages needed for true RS232/EIA232 compatibility and to convert these
voltages back to logic levels.
It
is particularly suited to micro-controller applications; for instance the
PIC or ATMEL families of devices and products using these.
The
RLC-1 is built into a small DB9 backshell with a short (10cm or 4") lead
terminating in a standard 0.1" (2.54mm) Molex KK-series 6 pin connector.
The connector is used to provide power to the converter and deliver the
Serial data signals to the attached circuit.
Its
small size and convenience make it ideal for prototype or one-off systems,
eliminating the need to design and debug extra level shifting circuits.
It is also useful for circuits that need periodic connection to a host
like dataloggers where a single converter can be used with many products,
reducing the parts count and therefore cost for the individual units.
Connections
RS232
Interface
The
RLC-1 is build into a DB9 Backshell and comes with a female DB9 connector.
The
DB9 RS232 connector is wire as a standard "Null Modem"; DTR, DSR and CD
are permanently wired together but the RTS and CTS signals are provided
to the 5-Volt interface and must be connected together if not used in the
attached circuit.
5-Volt
Logic Level Interface
The
5-Volt logic level (CMOS and TTL compatible) interface is a Molex KK Series,
locking and polarised 6 pin crimp terminal housing. A compatible header
for these connectors should be available from most electronics stores,
alternatively a 0.1" (2.54mm) universal header could be used.
Note
that the logic level interface is not isolated from the RS232 level interface
and they share a common ground.
| Pin |
Signal |
Description |
| 1 |
Vcc |
Power
supply to the RLC-1. 5 Volts. |
| 2 |
Gnd |
Ground
Connection (0V). |
| 3 |
Data
Out (TX) |
Data
sent from the logic level device to the RS232 device. |
| 4 |
Data
In (RX) |
Data
sent from the RS232 device to the logic level device. |
| 5 |
RTS |
Request
to Send signal sent from the RS232 device to the logic level device to
indicate it wishes to transmit data. This signal is Active Low. |
| 6 |
CTS |
Clear
to Send signal sent from the logic level device to the RS232 device indicating
that it can begin sending data. This signal is Active Low. |
Specifications
Absolute
Maximum Ratings:
Absolute
Maximum Ratings are those values beyond which damage to the device may
occur. Functional operation under these conditions is not to be implied.
| Symbol |
Parameter |
Value |
Unit |
Notes |
| Vcc |
Unit
Power Supply |
-0.3
to 6 |
V |
Relative
to Ground |
| VDout |
Input
Voltage on Data Out Connection |
-0.3
to (Vcc + 0.3) |
V |
Relative
to Ground |
| VDin |
Output
Voltage on Data In Connection |
-0.3
to (Vcc + 0.3) |
V |
Relative
to Ground |
| TStore |
Storage
Temperature Range |
-55
to +125 |
Deg
C |
|
Electrical
Characteristics:
Vcc
= 5V +/-10%, TA = -40 to 85 Deg C, unless otherwise specified.
Typical Values are referred to TA = 25 Deg C.
| Symbol |
Parameter |
Conditions |
Value |
Unit |
| Min |
Typical |
Max |
| Isupply |
Vcc
Power Supply Current |
No
Load, TA = 25 Deg C |
|
5 |
10 |
mA |
| IIL |
Logic
Level Input Pull-Up Current. DOut & CTS. |
Pin
voltage = 0V |
|
15 |
200 |
uA |
| VIL |
Logic
Level Input Threshold Low |
|
|
|
0.8 |
V |
| VIH |
Logic
Level Input Threshold High |
|
2 |
|
|
V |
| VOL |
Logic
Level Output Voltage Low |
Iout
= 3.2mA (to Vcc) |
|
|
0.4 |
V |
| VOH |
Logic
Level Output Voltage High |
Iout
= 1mA (to Gnd) |
3.5 |
Vcc
- 0.4 |
|
V |
| DR |
Data
Rate |
|
120 |
220 |
|
Kbits/s |
Options
Available
Digital
Nemesis Pty Ltd makes a single standard unit, but is able to adapt them
as needed. Note that a minimum order quantity will apply for non-standard
configurations. For more information, please contact sales AT digitalnemesis.com.
The
following are some of the available options:
-
3 Volt
Logic Version
-
Rugged
All Metal Backshell
-
No Backshell
-
Bare Leads
for Logic Level Interface
-
Custom
Connector for Logic Level Interface
RTS
and CTS internally connected and a 4 Pin connector for the Logic Level
Interface
Price
includes Airmail World Wide Postage
This
is an assembled and tested unit, not a kit!
Support:
If
you need additional support on the above product, and you can't find the
information you need in the documentation, then please contact support
at the address below:
This
product is from: Digital Nemesis
http://www.digitalnemesis.com
Ashley
Roll
sales
at digitalnemesis.com
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