© 2013
PAGE 4
WTC3293
www.teamwavelength.com
WTC3293-00400-I
CONFIGURING THE EVALUATION BOARD
STEP 1: CONFIGURE JUMPERS & SWITCH
POWER SELECT JUMPER
The factory default is to separate the V
S
and
V
DD
power supply inputs. V
S
drives the output
stage while V
DD
powers the control electronics.
You can tie these together instead by moving
the Power Select Jumper to the “
V
S
+ V
DD
”
position, “
1
”. Note that when in this position,
V
S
on the input terminal block pin will be at the
same potential as the V
DD
pin.
VSET SOURCE JUMPER
The factory default is to use the onboard
setpoint trimpot to generate the setpoint voltage
(“
T
” position). To use an external signal through
the RSET input, move this jumper to the “
X
”
position. To use the HSET input, completely
remove the jumper.
SENSOR GAIN JUMPER
If you are using a low resistance thermistor
(< 2.5 k
Ω
) or RTD (100
Ω
), move the jumper to
the 10X position to amplify the sensor feedback
signal by a factor of ten.
Sensor signal at SEN+ (TB4) should not
exceed V
DD
- 2V. Minimum recommended
signal is 250 mV in order to meet published
speci
fi
cations.
SENSOR BIAS SWITCH
Use Table 1 to con
fi
gure the evaluation board
for your temperature sensor type.
Sensor signal at SEN+ (TB4) should not
exceed V
DD
- 2V. Minimum recommended
signal is 250 mV in order to meet published
speci
fi
cations.
1X
10X
GAIN
GAIN
Table 1 - Sensor Dipswitch Con
fi
guration
Figure 6
Bottom View, Jumper Locations -- Factory Default
POWER SELECT JUMPER
(separate supplies shown)
SENSOR BIAS SWITCH
(100
μ
A shown)
SENSOR GAIN JUMPER
(GAIN = 1 shown)
VSET SOURCE JUMPER
(use onboard trimpot shown)
Figure 3
Power Select Jumper Settings
Figure 4
VSET Source Jumper Settings
Figure 5
Sensor Gain Jumper Settings
X
X
X
T
T
T
Trimpot is
Source
RSET is
Source
HSET is
Source
1
V
S
+ V
DD
2
1
V
S
+ V
DD
2
Dual Supply
Operation
Single Supply
Operation
0 to 2.5 k
Thermistor
(with GAIN = 10)
Sensor Type
100
Platinum RTD
2.5 k
to 25 k
Thermistor
25 k
to 250 k
Thermistor
LM335
AD590 (Follow the WTC3243
datasheet for connecting
an
AD590)
Off
On
10
μ
A
Off
Off
Off
Off
1 mA
Off
Off
Off
Off
On
On
100
μ
A
Off
Off
Off
Off
On
On
