Research and Development
Technical Documentation
Form Rev. A
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Description:
2400MHz RF Module with Frequency Hopping
7 of 10
2. Microcontroller Interface
Pin Layout
CSM FH uses a pin layout compatible with legacy Hetronic radio modules. This layout allows the CSM FH to be used
in devices that accept direct installation of the legacy module. Please note, however, that the pins are not utilized the
same way as the legacy radios, and software modification of devices is required to make use of the CSM FH radio
module.
Figure 2 - CSM FH Pin Layout
Pin Description
Pin Label
Type
FH Pin Description
GND
S
Negative Supply Input, 0 V DC (Ground)
BATT+
S
Positive Supply Input, 2.9-5.5 V DC
TXS
IPU
Not Used
1
RXS
IPU
Not Used
1
AF
O
Not Used
3
CLK
IPU
Not Used
1
DAT
I
Not Used
1
LE
I
Not Used
1
LD
O
Not Used
2
RSSI
O
Not Used
3
DO
O
UART command data out (CSM -> Host)
DI
IPU
UART command data in (Host -> CSM)
(S = Supply, I = Input, O = Output, B = Bi-Directional, PU = Pullup, PD = Pulldown)
Table 1 - CSM FH Pin Descriptions
Notes:
1 – These unused pins are pulled to BATT+ internally.
2 – The LD pin is driven LOW under CSM FH operation.
3 – The RSSI and AF pins are used for diagnostic output for the FHSS sub-system.
