EWM-900-FDTC-HS Radiotronix, EWM-900-FDTC-HS Datasheet - Page 11

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

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
Table 6, Receive VCO Register
The receive VCO control register determines the operating channel of the receiver. The receive
frequency is determined by the values of the A, F, and M counters. The trim bits are used to
adjust the tuning range of the receive 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 on either
the module’s PCB or, on newer modules, indicated on the product barcode sticker. The number is
two digits. The second digit represents the RX VCO trim value.
The actual receive frequency can be calculated using the following formula:
F=50E3 * (32 * M) + A +(F/8)
Example: Calculate the A, M, and F values for a base station (BS) receive frequency of 926 MHz.
M=578
A=24
F=0
For this example, assuming a trim value of 2, the programming word will be:
binary: 00101001 00001011 00000001
hex: 0x290B01
Table 9 lists the receive frequency and register values for each of the 56 receive channels. The
table lists these values for both the -BS and -HS versions of the transceiver.
Table 7, Transmit VCO Register
EWM-900-FDTC Data Sheet
Pad
M
M
A
A
7
0
7
0
2
2
5
5
Pad
A Count [2:0]
A Count [2:0]
M
M
A
A
T
6
0
6
2
1
1
4
4
Trim [2:0]
M
M
A
T
A
T
5
M Count [5:0]
5
M Count [5:0]
1
1
0
0
3
3
Trim [1:0]
M
M
F
T
F
T
Bit Position
Bit Position
4
4
2
0
2
0
2
2
F Register [2:0]
F Register [2:0]
Page 7
M
M
M
M
F
F
3
3
1
1
1
9
1
9
M
M
M
M
F
F
2
2
M Count [9:6]
M Count [9:6]
0
0
0
8
0
8
Register Sel [1:0]
Register Sel [1:0]
M
M
A
A
1
0
1
1
A Count [4:3]
A Count [4:3]
4
4
7
7
Revision 1.2 - 2/11/2004
M
M
A
A
0
1
0
0
3
3
6
6
Data Sheet
Byte
Byte
0
1
2
0
1
2