MCP9510HT-E datasheet(12/28 Pages) MICROCHIP

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MCP9509/10

DS22114A-page 12

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 TSET and de-asserts when

temperature falls below THYST. The output of the Cold

option asserts when temperature falls below TSET and

de-asserts when temperature rises above THYST.

For example, if TSET = 100°C for Hot option

(Active-Low Configuration, HYST = VDD), output

asserts Low when temperature is greater than

100°C ± TACY. The output de-asserts High when

temperature is below 90°C. For the Cold option, output

asserts

Low

when

temperature

less

than

100°C ± TACY, and de-asserts when temperature is

greater than 110°C. This operation is shown graphically

in Figure 4-4.

4.5

RSET vs. Temperature

The relation between the user selectable external

resistor RSET and the output trigger threshold limit TSET

is described as shown in

EQUATION 4-1: “TSET to

Rset conversion” and EQUATION 4-2: “RSET to Tset

conversion”. The equation coeffcients vary depending

on the device output options, H or C. Table 4-1 shows

the corresponding coefficients.

TABLE 4-1:

COEFFICIENTS/VARIABLES

EQUATION 4-1:

TSET TO RSET

CONVERSION

EQUATION 4-2:

RSET TO TSET

CONVERSION

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 TSET to RSET relation for Hot and

Cold options.

Coef.

MCP9509/10H

MCP9509/10C

Units

CR1

-9.84

-10.00

10-6k

Ω/°C3

CR2

3.355

3.345

10-3k

Ω/°C2

CR3

-0.8648

-0.8610

Ω/°C

CT1

-20.00

-19.7

10-6°C/k

Ω3

CT2

4.136

4.179

10-3°C/k

Ω2

CT3

-1.1564

-1.1617

°C/k

94.1

95.1

145.5

146.3

2.77

4.25

-40.0

°C

125.0

°C

Where:

CR1,2,3

1st, 2nd and 3rd order

Temperature to Resistance

Conversion Coefficients

(Table 4-1)

Resistance (Table 4-1)

T1,2

Temperature (Table 4-1)

SET

R1TSET TSET

–

() T

SET

–

() +

R2 TSET

–

() T

SET

–

() +

R3 TSET

–

() R

Where:

CC1,2,3

1st, 2nd and 3rd order

Resistance to Temperature

Conversion Coefficients

(Table 4-1)

R1,2,3

Resistance (Table 4-1)

Temperature (Table 4-1)

SET

T1 RSET

–

() R

SET

–

() R

SET

–

() +

T2 RSET

–

() R

SET

–

() +

T3 RSET

–

() T

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