ISL71590SEH Datasheet, PDF (11/16 Pages) Intersil Corporation – Radiation Hardened

ISL71590SEH
+15V
+
-
R_T
0.1%
ISL71590SEH
R_B
IS139
3
7
R₁
2
1
4
C
R₂
V_ZERO
R₃
HEATER
ELEMENT
ISL71090SEH12
1.25V
FIGURE 32. SINGLE SETPOINT TEMPERATURE CONTROLLER
In Figure 32, the ISL71590SEH produces a temperature
dependent voltage across R_T (C is for filtering noise). Setting R₂
produces a scale-zero voltage. For the celsius scale, make
R_T = 1kΩ and V_ZERO = 0.273V. For Fahrenheit, R_T = 1.8kΩ and
V_ZERO = 0.460V.
500µA
I
+
+
-
-
FIGURE 33. SIMPLEST THERMOMETER
Figure 33, illustrates the simplest thermometer displaying
current output directly in Kelvin. using the ISL71590SEH, sensor
output is within ±1.7K over the entire range.
V+
R₁
R₂
R
R₃
R₄
REF HI
REF LO
ICL7106
IN HI
R₅
+
T
ISL71590SEH
-
COMMON
IN LO
V-
FIGURE 34. BASIC DIGITAL THERMOMETER, CELSIUS AND
FAHRENHEIT SCALES
R
R₁
R₂
R₃
R₄
R₅
°F 9.00 4.02
2.0
12.4
10.0
0
°C 5.00 4.02
2.0
5.11
5.0
11.8
5
 ^Rn ^{= 28k nominal}
n=1
NOTE: ALL values are in kΩ.
In Figure 34, the ICL7106 has a V_IN span of ±2.0V and a V_CM
range of (V+ - 0.5V) to (V- + 1V). R is scaled to bring each range
within V_CM while not exceeding V_IN. The V_REF for both scales is
500mV, maximum reading on the celsius range is 150°C limited
by the maximum allowable sensor temperature. Maximum
reading on the fahrenheit range is 199.9°F (93.3°C) limited by
the number of display digits.
V+
7.5kΩ
5kΩ
2.26kΩ 15kΩ
SCALE
ADJ
REF HI
REF LO
ICL7106
IN HI
1.00kΩ
COMMON
+
T
ISL71590SEH
-
IN LO
V-
FIGURE 35. BASIC DIGITAL THERMOMETER, KELVIN SCALE
Figure 35, illustrates the Kelvin scale version reading from 0 to
1999K theoretically, and from 223K to 473K actually. The
2.26kΩ resistor brings the input within the ICL7106 V_CM range: 2
general-purpose silicon diodes or an LED may be substituted.
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June 3, 2016
FN8376.2