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9XTend™
OEM
RF
Module
–
Product
Manual
v1.2.4
©
2005
MaxStream,
Inc.
Confidential
&
Proprietary
6
1.3.
Pin Signals
Figure
1.1.
XTend
OEM
RF
Module
Pin
Numbers
Table
1.3.
Pin
Signal
Descriptions
(Low
‐
asserted
signals
distinguished
with
a
horizontal
line
over
signal
name.)
Pin
Number
Mnemonic
I/O
High Impedance
during Shutdown
Must
Connect
Function
1 GND
- -
yes
Ground
2 VCC
I -
yes
Power: 2.8 – 5.5 VDC
General Purpose Output 2: <Default (CD=2)> Pin is driven low. Refer to the
CD Command [p21] for other configuration options.
3
GPO2 /
RX LED
O yes
-
RX LED: Pin is driven high during RF data reception; otherwise, the pin is
driven low. Refer to the CD Command [p21] to enable.
4
_PWR O
yes
-
Transmit_Power: Pin pulses low during RF transmission; otherwise, the pin
is driven high to indicate power is on and the module is not in Sleep or
Shutdown Mode.
5 DI
I yes yes
Data In: Serial data entering the module (from the UART host). Refer to the
Serial Communications [p9] section for more information.
6 DO
O yes
-
Data Out: Serial Data exiting the module (to the UART host). Refer to the
Serial Communications [p9] section for more information.
7
I
no
yes
Shutdown: Pin is driven high during operation and low during Shutdown.
Shutdown enables the lowest power mode (< 1 µA) available to the module.
Refer to the Shutdown Mode [p13] section for more information.
General Purpose Input 2: reserved for future use
8
GPI2 / SLEEP
I
yes
-
SLEEP: By default, SLEEP is not used. To configure this pin to enable Sleep
Modes, refer to the Sleep Mode [p14], SM Command [p32] & PW Command
[p28] sections.
General Purpose Output 1: reserved for future use
(Clear-to-Send): <Default (CS=0)> When pin is driven low, the UART
host is permitted to send serial data to the module. Refer to the Serial
Communications [p9] & CS Command [p21] sections for more information.
9
GPO1 /
/
RS-485 TX EN
O yes
-
RS-485 Transmit Enable: To configure this pin to enable RS-485 half and
full duplex communications. Refer to the Serial Communications [p9] & CS
Command [p21] sections.
General Purpose Input 1: reserved for future use
(Request-to-Send): By default,
is not used. To configure this pin to
regulate the flow of serial data exiting the module, refer to the Serial
Communications [p9] & RT Command [p31] sections.
10
GPI1 /
/
CMD
I yes
-
CMD (Command): By default, CMD is not used. To configure this pin to
enable binary command programming, refer to the Binary Commands [p16]
& RT Command [p31] sections.
I* no
-
Configuration: Pin can be used as a backup method for entering Command
Mode during power-up. Refer to the Command Mode [p15] section for more
information.
11
/
RSSI
O* no
-
Receive Signal Strength Indicator: By default, pin is used as an RSSI
PWM output after at the conclusion of the power-up sequence. Refer to the
RP Command [p30] for more information.
12-20
reserved / do not connect
*
Module
has
10K
Ω
internal
pull
‐
up
resistor
Note: When integrating the XTend Module with a Host PC Board, all lines that are not used should be left disconnected (floating).