Murata Electronics North America DNT900 Manual Do Utilizador
www.RFM.com
Technical support +1.800.704.6079
Page 23 of 58
©2008 by RF Monolithics, Inc.
E-mail: tech sup@rfm.com
DNT900 - 11/05/08
Pad
Name
Description
27
RSVD
Reserved pad. Leave unconnected.
28
RSVD
Reserved pad. Leave unconnected.
29
RSVD
Reserved pad. Leave unconnected.
30
/UART0 _ RTS
Default functionality is UART flow control input for the module’s host. A logic low allows data
flow from the module to the host; a logic high blocks data flow from the module to the host.
flow from the module to the host; a logic high blocks data flow from the module to the host.
31
UART0_RXD UART received data output to host from module.
32
UART0_TXD UART host data input to be transmitted by module.
33
/UART0 _ CTS
UART flow control output from the module to the host. A logic low should allow data flow
from the host; a logic high should block data flow from the host.
from the host; a logic high should block data flow from the host.
34
VMOD
Module’s +3.3 V regulated supply output. Connect to pad 3 to support 3.3 V full scale and/or
ratiometric ADC readings, etc. Current drain on this output should be no greater than 5
mA.
ratiometric ADC readings, etc. Current drain on this output should be no greater than 5
mA.
35
RSVD
Reserved pad. Leave unconnected.
36
RSVD
Reserved pad. Leave unconnected.
37
RSVD
Reserved pad. Leave unconnected.
38
RSVD
Reserved pad. Leave unconnected.
39
/RESET
Active low module hardware reset.
40
RSVD
Reserved pad. Leave unconnected.
41
GND
RF ground (DNT900CC only). Connect to the host circuit board ground plane.
42
RFIO
Alternate RF port to the U.FL connector (DNT900C only). The antenna can be connected to this
port with a 50 ohm stripline or coaxial cable. Leave unconnected when using the U.FL
connector.
port with a 50 ohm stripline or coaxial cable. Leave unconnected when using the U.FL
connector.
43
GND
RF ground (DNT900C only). Connect to the host circuit board ground plane.
Table 3.2.1
3.3 Input Voltages
DNT900 radio modules can operated from an unregulated DC input (Pad/Pin 19) in the range of 3.3
(trough) to 5.5 V (peak) with a maximum ripple of 5% over the temperature range of -40 to 85
(trough) to 5.5 V (peak) with a maximum ripple of 5% over the temperature range of -40 to 85
o
C. Apply-
ing AC, reverse DC, or a DC voltage outside the range given above can cause damage and/or create a
fire and safety hazard. Further, care must be taken so logic inputs applied to the radio stay within the
voltage range of 0 to 3.3 V. Signals applied to the analog inputs must be in the range of 0 to ADC_REF
(Pad/Pin 3). Applying a voltage to a logic or analog input outside of its operating range can damage the
DNT900 module.
fire and safety hazard. Further, care must be taken so logic inputs applied to the radio stay within the
voltage range of 0 to 3.3 V. Signals applied to the analog inputs must be in the range of 0 to ADC_REF
(Pad/Pin 3). Applying a voltage to a logic or analog input outside of its operating range can damage the
DNT900 module.
3.4 ESD and Transient Protection
The DNT900C and DNT900P circuit boards are electrostatic discharge (ESD) sensitive. ESD precautions
must be observed when handling and installing these components. Installations must be protected from
electrical transients on the power supply and I/O lines. This is especially important in outdoor installations,
and/or where connections are made to sensors with long leads. Inadequate transient protection can result
in damage and/or create a fire and safety hazard.
must be observed when handling and installing these components. Installations must be protected from
electrical transients on the power supply and I/O lines. This is especially important in outdoor installations,
and/or where connections are made to sensors with long leads. Inadequate transient protection can result
in damage and/or create a fire and safety hazard.