CTA28 RADIOMETRIX [Radiometrix Ltd], CTA28 Datasheet - Page 7

• Manufacturer Part Number: CTA28
• Description: CTA88 chip based 2-channel I/O Application Boards
• Manufacturer: RADIOMETRIX [Radiometrix Ltd]

The long timeout is usable with the randomised periodic transmission mode (101), as the 3 second timeout is
longer than the longest delay between transmissions in this mode.
Versions of the chip can be supplied with this period extended to suit customer requirements
CTA28/CTA88 board: External input operation
Option 1 (Default)
LK1A
LK1A will link the COM to the system ground
LK1B will link the +5V to the +5V system rail.
So, just linking the IN and +5V inputs will trigger the operation. It is useful for sliding switch
operation.
Option 2
COM: Local ground (not connected to system ground)
IN : 4mA Voltage sense
+5V: +5V bias current
Connecting external supply to the COM and IN will trigger the operation
Option 3
LK1A
LK1A will link the COM to the system ground.
Radiometrix Ltd
COM
COM
COM
OV
IN
IN
+Vcc
IN
LK1B
+Vcc
+5V
+5V
+5V
CTA28 Demo board
page 7