MCP9501 datasheet(8/20 Pages) MICROCHIP

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MCP9501/2/3/4

DS22268A-page 8

4.0

FUNCTIONAL DESCRIPTION

The

MCP9501/2/3/4

temperature

switch

family

integrates a thermal diode, a comparator, and a factory

selectable

resistive

network

used

set

the

temperature

thresholds.

The

available

output

thresholds range from -35°C to 125°C at 10°C

increments. There is no additional configuration

required to operate this device. The selectable output

hysteresis is controlled using a single input pin. When

this pin is connected to ground, the output hysteresis is

2°C (typical) and when connected to VDD the output

hysteresis is 10°C (typical). Figure 4-1 shows the

functional block diagram.

FIGURE 4-1:

Functional Block Diagram.

There are two output configurations for this family, a

push-pull and an open-drain output with active-high

and active-low assertions. These assertion options are

referred to as Cold and Hot options, primarily due to the

direction of selected hysteresis. For the Cold option,

temperature has to fall below the threshold for the

output to assert High, and de-assert Low when the

temperature rises above the threshold plus the

hysteresis. For example, a 65°C threshold and 2°C

(typical) hysteresis, when temperature falls below 65°C

the output asserts High, and the de-asserts Low when

temperature rises above 67°C. For the Hot option, the

opposite is true. When temperature rises above 65°C,

the output asserts Low, and de-asserts High when the

temperature falls below 63°C. Figure 4-2 shows a

graphical description for the Hot and Cold options.

FIGURE 4-2:

Output Hysteresis.

The Push-Pull output is ideal for a microcontroller

interface using an input/output pin or an interrupt input

pin. The open-drain option can be used with multiple

sensors in a wired-OR configuration or as a level

shifter.

ISET

OUT/

OUT

Thermal

Diode

Hysteresis

Select Pin

Threshold

Select

Cold

Hot

TSET

THYST

Temperature

10°C Typical Hysteresis

2°C Typical

Hysteresis

Cold

Hot

TSET

THYST

Temperature

10°C Typical Hysteresis

2°C Typical

Hysteresis

Hot-Option (Active-Low)

Cold-Option (Active-High)

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