MCP9510HT-E datasheet(11/28 Pages) MICROCHIP

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DS22114A-page 11

MCP9509/10

4.0

FUNCTIONAL DESCRIPTION

The MCP9509/10 integrates a temperature switch with

a user programmable threshold. The temperature

switch threshold or alert limit is programmed using an

external resistor RSET. A logic signal is asserted when

the die temperature crosses the programmed alert

limit. The MCP9509 has an Open-Drain output which

requires an external pull-up resistor for operation. The

MCP9510 output can be configured to three user

selectable output configurations. The OUTSET pin is

used to select Active-Low Push-Pull, Active-Low

Open-Drain (with internal 100 k

Ω pull-up resistor),

Active-High Push-Pull output configurations. In addi-

tion, this device provides user selectable hysteresis of

2°C and 10°C (typical).

4.1

SET Input Pin

The SET input pin is used to connect an external

resistor RSET. The resistor sets the alert threshold. The

SET pin outputs a constant current ISET (~5 µA) to bias

RSET (Shown in Figure 4-1). The voltage across RSET,

VSET, is compared to an internal thermal diode.

FIGURE 4-1:

SET input.

When the thermal diode voltage exceeds VSET, the

sensor

output

asserts.

The

assert

polarity

determined by the state of the OUTSET pin.

4.2

MCP9510 OUTSET Input Pin

This pin is used to select the device output configura-

tion. This feature enables in-circuit device output con-

figuration by driving this pin with a microcontroller I/O

pin to Output-HIGH, Output-LOW, or High-Impedance

input. Figure 4-4 shows the configuration and output

conditions.

The input structure of this pin consists of a resistor lad-

der and comparators to determine OUTSET level

threshold. Figure 4-2 shows the circuit configuration.

The OUTSET input resistance must be carefully

considered for leakage current when connecting volt-

age source to change output configuration.

FIGURE 4-2:

MCP9510 OUTSET Input

Structure.

The OUTSET pin input impedance ZOUTSET is set by

the internal resistance RA = 1 MΩ (typical). The input

structure is a voltage divider network from VDD.

Therefore, the leakage current on the OUTSET pin is a

function of change in VDD and the VOSET.

4.3

HYST Input Pin (Hysteresis Select)

The MCP9509/10 family has a user selectable

hysteresis input pin HYST. Hysteresis can be externally

selected to either 2°C (HYST = GND) or 10°C

(HYST = VDD). Figure 4-3 shows graphical description

of change in hysteresis.

For example, if the alert temperature threshold is set to

TSET = 100°C (RSET = 16.1 kΩ) with an Active-Low out-

put configuration, the output asserts Low when temper-

ature exceeds 100°C ± TACY. The output remains

asserted Low until temperautre falls below THYST, 98°C

(HYST = GND) or 90°C (HYST = VDD).

FIGURE 4-3:

Output Hysteresis.

SET

RSET

VSET

ISET

OUT/

OUT

Thermal

Diode

VDD

OUTSET

MCP9510

Cold

Hot

TSET

THYST

Temperature

10°C Typical Hysteresis

2°C Typical

Hysteresis

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