Wavelength Electronics WTC32ND, Datasheet And Operating Manual

Page: 24 / 37

© 2022 www.teamWavelength.com 24
WTC32ND TEMPERATURE CONTROLLER
OPERATING WITH AD590 TYPE TEMPERATURE SENSORS
AD590 type temperature sensors have the best linearity, good sensitivity,
a temperature range of -20º to +105º C, but are larger in size. Operation
requires that V
DD
be +8 V or greater.
The following diagrams demonstrate how to configure the WTC32ND for
operation with an Analog Devices AD590 Temperature Sensor. An online
calculation utility to determine resistances is available at:
https://www.teamwavelength.com/support/design-tools/wtc-calculator/
Figure 22. AD590 / Thermoelectric Operation -- Top View
Figure 23. AD590 / Resistive Heater Operation -- Top View
IF YOU ARE UPGRADING FROM THE WHY SERIES: The position of Pin 1 on the WHY is reversed (or mirrored) relative
to the position of Pin 1 on the WTC32ND.
TOP VIEW
V
S
V
DD
TIE GROUND CONNECTIONS DIRECTLY TO PIN 13
1
WTC32ND
Temperature
Controller
1
2
3
4
5
6
7
14
13
12
11
10
9
8
Actual
Temperature
Monitor voltage
V
DD
R
I
R
P
R
LIMA
R
LIMB
Adjusting PI
Control Loop
Adjusting Limit
Currents
V
SET
1
1
-
+
NC
VSET =
(1 µ A x 10k Ω )
x Operating Temp K
K
NC
AD590
10k
Ω
V
DD
Bandgap
Voltage
Reference
W
CCW
OR OR
D/A
TOP VIEW
V
S
V
DD
TIE GROUND CONNECTIONS DIRECTLY TO PIN 13
1
WTC32ND
Temperature
Controller
1
2
3
4
5
6
7
14
13
12
11
10
9
8
Actual
Temperature
Monitor voltage
V
DD
R
I
R
P
R
LIMA
1.5 k Ω
Adjusting PI
Control Loop
Adjusting Limit
Currents
V
SET
OR
D/A
1
1
NC
VSET =
(1
µ
A x 10k
Ω
)
x Operating Temp K
K
NC
AD590
NC
V
S
10 k
Ω
V
DD
Bandgap
Voltage
Reference
W
CCW
OR
QUICK CONNECT LEGEND
DIAGRAM
REFERENCE
TABLE OR EQUATION
R
LIMA
Table 9 on page 25
R
LIMB
Table 9 on page 25
R
P
Table 11 on page 27
R
I
Table 12 on page 27
R
BIAS
N/A
R
T
Sensor datasheet
R
G
N/A