CONTROL124 Datasheet, PDF (3/7 Pages) Radiometrix Ltd – 4 bit Address - 12 bit Data encoder/decoder

Decoder Mode
Control124 can be put into Decoder Mode by connecting Mode (pin 2) to Ground.
5V
supply
RF
RXD
Vcc
GND
3.58MHz
470R
470R
470R
470R
RST
LATCH
RXD
STB
MODE
NC
NC
Vss
OSC1
OSC2
DA0
DA1
DA2
DA3
DB3
DB2
DB1
DB0
A3
A2
A1
A0
Vdd
Vss
DA7
DA6
DA5
DA4
470R
470R
470R
470R
470R
470R
470R
470R
100nF
Figure 3: Control124 in Decoder Mode
Pin
Name
1
RST
2
LATCH
3
4
5
6
7
8
9
10
11 - 18
19
20
RXD
STB
MODE
NC
NC
VSS
OSC2
OSC1
DA0 - DA7
VSS
VDD
21 - 24 A0 - A3
25 - 28 DB0 - DB3
Input/Outp
ut
Input
Input
Input
Output
Input
-
-
Supply
Output
Input
Output
Supply
Supply
Input
Output
Description
Active Low Reset (Connect to user system reset or tie to Vdd)
0V = latch DA3:D0 until next packet
Vdd = clear DA3:DA0 after 150ms (no pull-up)
Encoded Address and Data from RXD Output of RF Receiver
Positive going pulse on reception of valid data packet. 10µs duration
RX=0V, TX=Vdd (no pull-up, only read at reset/power up)
-
-
Supply Ground
3.58MHz resonator¹
3.58MHz resonator¹
8 bits of Data A²
Supply Ground
4.5-5.5V supply (decouple with 0.1µF close to IC)
2.0V-5.5V (low voltage version)
Least significant 4 bits of Address (Internal pull-ups to Vdd)²
Least significant 4 bits of Data B²
Notes:
1. OSC1, 2 require a 3.58MHz ceramic resonator with internal capacitors like Murata
CSTLA3M58G55-B0. If a 2 pin resonator or crystal is used, then two 15pF-22pF caps are
needed: one from OSC1 to 0V another from OSC2 to 0V. 100Ω series resistor between OSC2 and
crystal may be required when driving low frequency crystal with High Speed (H) CTR124H
version.
2. Absolute maximum source/sink current from each DA0-DA7, DB0-DB3, A0-A3 pins is 25mA
Absolute maximum total current from DA0-DA7 port and DB0-DB3, A0-A3 port is 200mA
3. MODE pin is only read at reset/power up. Connect to either Vdd (Encoder) or 0V (Decoder).
4. Without external loads the CTR124 draws <2mA from 5V supply.
5. Standard version can be used down to 4V for <20MHz oscillator.
Low voltage version can be used down to 2V for <4MHz oscillator.
6. High Speed, CTR124H, version should not be used with Narrow Band FM radio modules.
Radiometrix Ltd
Control124
page 3