Murata Electronics North America CCT24 Manual Do Utilizador
Page 35 of 90
CCT24
25
ACT
O
Data activity output, logic high when data is being transmitted or received.
26
/DCD
O
Default functionality is data carrier detect output, which provides a logic low on a remote when the
module is locked to FHSS hopping pattern and logic low on a base when at least one remote is
connected to it.
module is locked to FHSS hopping pattern and logic low on a base when at least one remote is
connected to it.
27
RSVD
-
Reserved pad. Leave unconnected.
28
RSVD
-
Reserved pad. Leave unconnected.
29
RSVD
-
Reserved pad. Leave unconnected.
30
/HOST_RTS
I
UART flow control input. The host sets this line low to allow data to flow from the CCT24 on the
RADIO_TXD pin. When the host sets this line high, the CCT24 will stop sending data.
RADIO_TXD pin. When the host sets this line high, the CCT24 will stop sending data.
31
RADIO_TXD
O
UART transmitter output. The CCT24 sends serial data to the host on this pin. The sleep mode state
of this pin is configurable.
of this pin is configurable.
32
RADIO_RXD
I
UART receiver input. The CCT24 receives serial data from the host on this pin.
33
/HOST_CTS
O
UART or SPI flow control output. The CCT24 sets this line low to indicate it is ready to accept data
from the host on the RADIO_RXD or MOSI input. When the CCT24 sets this line high, the host must
stop sending data. The sleep mode state of this pin and /DCD is jointly configurable.
from the host on the RADIO_RXD or MOSI input. When the CCT24 sets this line high, the host must
stop sending data. The sleep mode state of this pin and /DCD is jointly configurable.
34
VMOD
O
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
/SS
-
SPI active low slave select. This pin is an output when the CCT24 operating as a master, and an
input when it is operating as a slave.
input when it is operating as a slave.
36
MOSI
-
SPI master out, slave in function. This pin is an output when the CCT24 is operating as a master,
and is an input when the CCT24 is operating as a slave.
and is an input when the CCT24 is operating as a slave.
37
MISO
-
SPI master in, slave out function. This pin is an input when the CCT24 is operating as a master, and
is an output when the CCT24 is operating as a slave.
is an output when the CCT24 is operating as a slave.
38
SCLK
-
SPI clock signal. This pin is an output when operating as a master, and an input when operating
as a slave.
as a slave.
39
/RESET
I
Active low module hardware reset.
40
RSVD
-
Reserved pad. Leave unconnected.
Table 3.2.1
3.3 CCT24 Antenna Connector
A U.FL miniature coaxial connector is provided on both CCT24 configurations for connection to the RFIO
port. A short U.FL coaxial cable can be used to connect the RFIO port directly to an antenna. In this case
the antenna should be mounted firmly to avoid stressing the U.FL coaxial cable due to antenna mounting
flexure. Alternately, a U.FL coaxial jumper cable can be used to connect the CCT24 module to a U.FL
connector on the host circuit board. The connection between the host circuit board U.FL
port. A short U.FL coaxial cable can be used to connect the RFIO port directly to an antenna. In this case
the antenna should be mounted firmly to avoid stressing the U.FL coaxial cable due to antenna mounting
flexure. Alternately, a U.FL coaxial jumper cable can be used to connect the CCT24 module to a U.FL
connector on the host circuit board. The connection between the host circuit board U.FL
Figure 3.3.1