LMR1-173-5-12K5 查看數據表（PDF） - Radiometrix Ltd

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LMR1-173-5-12K5

VHF Narrow Band FM Low Cost multi channel radio modules

Radiometrix Ltd 

Figure 5: LMR1 footpint (top view)

Pin description – LMR1

Pin

Name

1a

Vcc

2a

0V

3a

RXE

4a

RXD

5a

AF out

Function

3.1 – 15V power supply

Ground

Receiver Enable (active high)

Data out (open collector, no pullup)

700mV p-p audio. DC coupled, approx 0.8v bias.`

1b

P0/PGM

2b

P1

3b

P2

4b

P3

5b

RSSI

Parallel Channel select LSB

Serial frequency programming / configuration1

Parallel Channel select

Parallel Channel select

Parallel Channel select MSB

DC level between 0.5v and 2.2v. 60dB dynamic range

NOTES:

1. Serial programming is by an inverted, cmos logic level, 2400 baud RS232 datastream applied to

the P0 pin.

2. Channel select inputs have pullups (50kΩ) to 3v internal rail. Do not exceed 3v logic levels on

this port.

3. Channel select inputs are active low

4. All pins are on an 0.1" grid

5. Data recovery circuit used for RXD is not a simple 'average and compare' type. It is a peak

sampling quasi-DC coupled design, allowing a greater than usual flexibility in data format.

6. Unit will operate (with marginally reduced specifications) from a 3.0v rail. This must be well

regulated and without noise or ripple, as in this state the unit's internal regulator no longer

operates, and provides no supply rejection.

Radiometrix Ltd

LMT1/LMR1 Data Sheet

page 5

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