I9600 Datasheet, PDF (2/7 Pages) Radiometrix Ltd – 9600 baud Transparent Data Link IC

User Interface
NC
TEST
SETUP
NC
Vss (0V)
NC
RS TXD
RS RXD
BUSY
1
18
TXE
2
17
RXE
3
16
OSC1
4
15
OSC2
5
14
Vdd (+5V)
6
13
TXD
7
12
NC
8
11
NC
9
Figure 2: package type, 18-Lead Plastic Dual In-line (PDIP - 300mil wide body)
Pin description:
Pin
Name
I/O Function
1
NC
-
No Connection
2
Test
in
A 10kΩ pullup to VCC must be provided
3
SETUP
in
low = enter setup mode (address programming): high = normal
operation
4
NC
-
No Connection
5
0V
-
Supply ground
6
NC
-
No Connection
7
RSTXD
in
Inverted RS232 datastream in, 9600 baud
8
RSRXD
out
Inverted RS232 datastream out, 9600 baud
9
BUSY
out High indicates data received or in rx FIFO buffer
10
RXD
in
Baseband input from receiver data output
11 - 12 NC
-
No Connection
13
TXD
out Baseband output to transmitter data input
14
Vcc
-
5V (regulated power supply); Decouple with 0.01uF close to IC
15
OSC2
out connect to 20.48MHz crystal via 100Ω resistor
16
OSC1
in
connect to 20.48MHz crystal
17
RXE
out Active low enable receiver
18
TXE
out Active low enable transmitter
Notes:
1. No connections at all may be made to 'nc' pins
2. TXD, RXD, RSRXD, RSTXD and BUSY are 5V CMOS logic level
3. Some Radiometrix transmitters require 3V logic levels on their transit data inputs:
a divider (4.7kΩ series, 10kΩ to ground) on the TXD pin is needed
4. In RX operation, Dout becomes a high impedance
5. After pulling TXE low (active), the coder allows about 3mS for TX to power up and settle
6. RSTXD (7) has no pullup. If the device is only used for receive, then tie this pin to VCC
7. Vcc must be a 5v regulated supply (4.75 - 5.25V). At this oscillator speed the PIC will not operate
reliably at 3V
8. A 16kbit/sec modified biphase comms protocol is used
9. Pin 3 has no pullup. It is used to enter 'setup' mode (see below)
11. Without external loads the chip draws less than 5mA from 5v
12. BUSY goes high when valid data is present in the receive buffer.
13. A simple addressing structure is included in the datastream.
Units may be programmed onto one of eight addresses (all units are supplied set to default addr=0)
14. OSC1, 2 require a 20.48MHz fundamental mode crystal, a series 100Ω resistor from OSC2,
and a pair of 15pF caps : from the crystal pins to 0V
Radiometrix Ltd
i9600 Data Sheet
page 2