Maiman Electronics LLC
SF8300
11
16.6.
TEC temperature set
The
«TEC temperature set»
pin is an analog input.
The
«TEC temperature set»
is intended for setting the desired temperature of laser module.
Apply voltage to the
«TEC temperature set»
with respect to GND to set the desired temperature.
The applied voltage must correspond to the desired resistance of the thermistor.
The specified voltage U [V] is related to the resistance of the thermistor R [Ohm] by the
formula:
For example, to obtain a thermistor resistance of 10000 Ohm, a voltage of 1.25 V must be
applied to the
«TEC temperature set»
pin. The 10 kOhm resistance corresponds to 25 ° C for the
NTC thermistor 10k. A lower input voltage corresponds to a lower resistance of the thermistor
(higher temperature) and vice versa.
When translating the resistance of the thermistor to the temperature t [° C], it is necessary
to consider the coefficient B25 / 100 [K], specified in the manufacturer's specifications:
16.7.
Driver current monitor
The output current of the driver can be monitored by current monitor.
16.8.
TEC temperature monitor
The
«TEC temperature monitor»
pin
is an analog output and allows to track the temperature
of the laser diode.
Proportions described in paragraph 16.6 are valid for this Pin.
16.9.
NTC Interlock (External thermistor connection)
This allows to measure the temperature of a laser diode or other devices. The measurement
result is readable by the digital interface. You can set upper and lower limits of the temperature
using the digital interface (with command or software). If the temperature goes beyond the limits,
the driver operation is blocked. When the temperature returns to the specified range, the driver
operation resumes. After setting, limits will be saved in device memory and will work when used
both digital and analogue control.
17.
Current / Temperature setting variants
Parameters can be set in three ways: using potentiometer, analog control connector or
digital commands. Signal sources for current and temperature can be set independently of each
other.
Signal source
Digital state
Board jumper state
Potentiometer
External (default at power up)
INT
Analog control connector
External (default at power up)
EXT
Digital
Internal
INT or EXT