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MCP9509/10
4.4 Sensor Hot/Cold Options
MCP9509/10 is available with Hot (H) and Cold (C)
options. The MCP9509/10 Hot option detects rising
temperature while the Cold option detects falling tem-
perature. The output of the Hot option asserts when
temperature rises above T SET and de-asserts when
EQUATION 4-1: T SET TO R SET
CONVERSION
R SET = C R 1 T SET ( T SET – T 1 ) ( T SET – T 2 ) +
C R 2 ( T SET – T 1 ) ( T SET – T 2 ) +
C R 3 ( T SET – T 1 ) + R 2
temperature falls below T HYST . The output of the Cold
option asserts when temperature falls below T SET and
de-asserts when temperature rises above T HYST .
For example, if T SET = 100°C for Hot option
(Active-Low Configuration, HYST = V DD ), output
asserts Low when temperature is greater than
100°C ± T ACY . The output de-asserts High when
temperature is below 90°C. For the Cold option, output
asserts Low when temperature is less than
Where:
C R1,2,3
R 2
T 1,2
=
=
=
1st, 2nd and 3rd order
Temperature to Resistance
Conversion Coefficients
( Table 4-1 )
Resistance ( Table 4-1 )
Temperature ( Table 4-1 )
100°C ± T ACY , and de-asserts when temperature is
greater than 110°C. This operation is shown graphically
in Figure 4-4 .
EQUATION 4-2:
R SET TO T SET
CONVERSION
4.5 R SET vs. Temperature
The relation between the user selectable external
resistor R SET and the output trigger threshold limit T SET
is described as shown in EQUATION 4-1: “T SET to
R set conversion” and EQUATION 4-2: “R SET to T set
conversion” . The equation coeffcients vary depending
on the device output options, H or C. Table 4-1 shows
the corresponding coefficients.
T SET = C T 1 ( R SET – R 1 ) ( R SET – R 2 ) ( R SET – R 3 ) +
C T 2 ( R SET – R 3 ) ( R SET – R 2 ) +
C T 3 ( R SET – R 2 ) + T 1
Where:
C C1,2,3 = 1st, 2nd and 3rd order
Resistance to Temperature
Conversion Coefficients
( Table 4-1 )
TABLE 4-1:
COEFFICIENTS/VARIABLES
R 1,2,3
=
Resistance ( Table 4-1 )
Coef.
MCP9509/10H
MCP9509/10C
Units
T 1
=
Temperature ( Table 4-1 )
C R1
C R2
C R3
C T1
C T2
C T3
R 1
R 2
R 3
T 1
T 2
-9.84
3.355
-0.8648
-20.00
4.136
-1.1564
94.1
145.5
2.77
-40.0
125.0
-10.00
3.345
-0.8610
-19.7
4.179
-1.1617
95.1
146.3
4.25
10 -6 k Ω /°C 3
10 -3 k Ω /°C 2
k Ω /°C
10 -6 °C/k Ω 3
10 -3 °C/k Ω 2
°C/k Ω
k Ω
k Ω
k Ω
°C
°C
The equations can be used to determine the external
resistance value for a specified temperature threshold
or threshold value for a specified resistance. Table 4-2
and Table 4-3 show a look-up table which can be used
to easily identify the T SET to R SET relation for Hot and
Cold options.
DS22114A-page 12
? 2008 Microchip Technology Inc.
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