USX2 Просмотр технического описания (PDF) - Radiometrix Ltd
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USX2 Datasheet PDF : 9 Pages
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Figure 3: Provisional USX2 footprint (Top)
Pin Description
Pins
1A
2A
3A
Normal mode
RF Gnd RF ground
RF in/out To the antenna
RF Gnd RF ground
Serial mode
Modem mode
1
TXD
2
TXE
3
GND
4
Vcc
5
P3
6
P2
7
P1
8
P0
9
RSSI
10 RXD
11 AF out
DC coupled input for TTL/ CMOS logic
Transmit enable.
Low = RX mode. High = TX. (10k pull down)
(0V)
DC supply input (3.6 –15V)
Parallel channel select MSB
Parallel channel select
P1 - Parallel channel select
P0 - Parallel channel select LSB
DC level between 0.5V and 2.5V. 60dB
dynamic range
Open collector output of data slicer
500mV p-p audio. DC coupled, approx 0.8V
bias
NC
NC
Serial read back
TBA
TBA
PGM in
BUSY
MOD TXD
MOD RXD
PGM in
NC
NC
NOTES:
1. No inversion occurs between TXD and RXD. However AF out is inverted relative to TXD.
2. Parallel channel selects (P0-P3) and TXE are active LOW and have 47k internal pullups to 3V
3. Open collector output RXD has a 47 k pullup to 3V.
4. The software incorporates a 1200 baud modem, compatible with that implemented in other Radiometrix
narrowband units ( i1200 tones and format ). Modem operation is selected by serial command.
5. Main serial port (P0, P3) operates at 9600 baud. (Command set is not the same as TR2M, SMX
families). The unit is capable of operating in 'basic' parallel channel select only mode, or in serial
controlled 'expanded' mode
6. Transmit power can be set by serial command
7. RSSI can be read back as a digital value. (on P3)
8. If analogue transmit modulation is needed, then connect a series 1 F cap + 500k trimmer (a multiturn
is advised) in the TXD circuit. Adjust trimmer for 90% of peak deviation (+/- 2.7KHz) at mean input level.
Radiometrix Ltd
USX2 Data Sheet
page 3
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