EWM-900-FDTC-HS Radiotronix, EWM-900-FDTC-HS Datasheet - Page 12

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EWM-900-FDTC-HS

Manufacturer Part Number
EWM-900-FDTC-HS
Description
RF Modules & Development Tools Head Set
Manufacturer
Radiotronix
Datasheet

Specifications of EWM-900-FDTC-HS

Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
(HS) EWM-900-FDTC
EWM-900-FDTC Full Duplex Voice/Data Transceiver
The transmit VCO control register determines the operating channel of the transmitter. The
receive frequency is determined by the values of the M, A, and F counters.
Note that the TX register has three trim bits, where the RX register has only two. The trim bits are
used to adjust the tuning range of the transmit VCO. The trim value is determined at the factory
and is provided with each module. It is clearly marked on the top of the module in indelible ink.
The number is two digits. The first digit represents the TX VCO trim value. The actual transmit
frequency can be calculated using same formula as for the receive register. See the receive
register description for more information on calculating the M, A, and F values.
Table 9 lists the M, A, and F values for each channel. Use this table to quickly determine the
values for programming.
Table 8, Mode Control Register
The mode control register determines the operating modes of the transceiver. With the register,
the designer can turn on and off the transmitter and operating channel of the transmitter. The
receive frequency is determined by the values of the M, A, and F counters.
Note that the TX register has three trim bits, where the RX register has only two. The trim bits are
used to receiver sections of the transceiver. RXE determines the state of the receiver. When the
bit is set to 1, the receiver is on. When the bit is set to 0 the bit is off.
TXE determines the state of the transmitter. When the bit set to 1, the transmitter is on. When the
bit is set to 0, the bit is off.
The transceiver is placed in power-down mode by turning both the transmitter and receiver off. In
this mode, the transceiver will draw <5uA. The on-board crystal oscillator is automatically
enabled when either the transmitter or receiver is enabled.
DAT determines the operating mode of the transmitter/receiver. When this bit is set to 1, the
internal data-slicer is enabled. This allows data reception.
When the DAT bit is set to 0, then internal data-slicer is disabled for audio reception.
EWM-900-FDTC Data Sheet
7
0
0
0
6
0
0
0
5
1
0
0
TXE
Bit Position
4
0
0
RXE
Page 8
3
0
0
2
0
0
1
1
1
0
0
Revision 1.2 - 2/11/2004
DAT*
0
1
0
Data Sheet
Byte
0
1
2

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