Falcon HED241 Manual Del Usuario página 2

The HED24 range of modules are complete clock/thermometers with high and low
temperature setpoints and an output signal which is triggered when a setpoint is reached.
The functionality in all the modules is the same; the differences are in size and locations
of solder pads for configuration.
• Thermostat function
• Display of 12 hour clock
• Extremely low current consumption
• Display of temperature in °C or °F
• Internal temperature sensor
• Facility for external sensor (optional extra)
A typical installation would include 5 pushbuttons or switches for adjusting the time, for
adjusting and displaying temperature setpoints and setting the operating mode. The audio
output, when triggered, remains present for 5 seconds.
Note:
This product is ideally suited to battery powered applications. Should the product be used
in a circuit where an external power source is used, then the complete system will require
separate approval to meet the CE standards.
Pin Connections
In the table the pushbuttons are numbered the same as the pins to which they refer.
Pin Function Application
1 PB1 In clock mode connect to V
2 PB2 In clock mode connect to V
connect to V
3 T Output goes high (1.5v) at and above the upper temperature setpoint
U
4 T Output goes high (1.5v) at and below the lower temperature setpoint
L
5 PB5 Sets operating mode. Connect to V
for display of temperature
6 PB6 Connect to V
7 PB7 Connect to V
8 V Voltage input (1.5v ±0.2v)
DD
9 BD Audio output 4096Hz for external Piezo driver
10 LED LED backlight input (5.0v ±0.5v) optional
11 N.C. Do not connect
12 V Zero volts
SS
13/14 TH External temperature sensor (thermistor)
INT
EXT
10s/1s
13
14
HED241
2
to adjust temperature setpoints (see pins 6 and 7)
DD
to display upper temperature setpoint
DD
to display lower temperature setpoint
DD
1
2
C/ F
TEST
12 11
to adjust hours
DD
to adjust minutes. In temperature mode
DD
for display of time; no connection
DD
HED242, HED243
14 13
C/ F
10s/1s
TEST
1
2
INT
EXT
11
12