Radiometrix Ltd

SMX2 Data Sheet

page 6

Application circuits

RSSI (1a)

Vcc (2a)

TXD (3a)

AF (4a)

RXD (5a)

TXE (6a)

PGM (7a)

0V (1b)

S0 (2b)

S1 (3b)

S2 (4b)

1k

Ω

1k

Ω

1k

Ω

RX

TX

1

2

3

TXD

SGD

4

6

7

8

9

5

ADC

TX/RX

TXD

Test point

RXD

Vdd

Vss

Parallel

Channel

Select

RF GND

3V

regulator

4.2-16V

Figure 4: SMX2 interfaced to host microcontroller and serial port for configuration

RSSI (1a)

Vcc (2a)

TXD (3a)

AF (4a)

MOD RXD (5a)

MOD TXD (6a)

PGM (7a)

0V (1b)

S0 (2b)

S1 (3b)

S2 (4b)

SMX2

1

2

3

TXD

SGD

4

6

7

8

9

5

PC serial port

RXD

RF GND

5 - 16V

SW1

2400 bps

SETMOD

1200 bps

2K2

(for 5V)

Figure 5: SMX2 interfaced to PC serial port (0V / 5V RS232 level)

RSSI (1a)

Vcc (2a)

TXD (3a)

AF (4a)

MOD RXD (5a)

MOD TXD (6a)

PGM (7a)

0V (1b)

S0 (2b)

S1 (3b)

S2 (4b)

SMX2

1

2

3

TXD

SGD

4

6

7

8

9

5

PC serial port

RXD

RF GND

5 - 16V

SW1

1200 bps

2K2

(for 5V)

MAX232

16 (+5V)

5K

Figure 6: SMX2 interfaced to serial port (+10V / -10V RS232 level)