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MCP9509/10
4.0
FUNCTIONAL DESCRIPTION
The MCP9509/10 integrates a temperature switch with
a user programmable threshold. The temperature
MCP9510
V DD
switch threshold or alert limit is programmed using an
external resistor R SET . 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),
OUTSET
Pin
R A
R A
R 1
R 2
R 3
+
-
-
+
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
FIGURE 4-2:
Structure.
MCP9510 OUTSET Input
The SET input pin is used to connect an external
resistor R SET . The resistor sets the alert threshold. The
SET pin outputs a constant current I SET (~5 μA) to bias
R SET (Shown in Figure 4-1 ). The voltage across R SET,
V SET, is compared to an internal thermal diode.
The OUTSET pin input impedance Z OUTSET is set by
the internal resistance R A = 1 M Ω (typical). The input
structure is a voltage divider network from V DD .
Therefore, the leakage current on the OUTSET pin is a
function of change in V DD and the V OSET .
4.3
HYST Input Pin (Hysteresis Select)
I SET
The MCP9509/10 family has a user selectable
R x
+
OUT/
OUT
hysteresis input pin HYST. Hysteresis can be externally
selected to either 2°C (HYST = GND) or 10°C
(HYST = V DD ). Figure 4-3 shows graphical description
SET
V SET
R SET
FIGURE 4-1:
-
Thermal
Diode
SET input.
of change in hysteresis.
For example, if the alert temperature threshold is set to
T SET = 100°C (R SET = 16.1 k Ω ) with an Active-Low out-
put configuration, the output asserts Low when temper-
ature exceeds 100°C ± T ACY . The output remains
asserted Low until temperautre falls below T HYST , 98°C
(HYST = GND) or 90°C (HYST = V DD ).
When the thermal diode voltage exceeds V SET , the
sensor output asserts. The assert polarity is
determined by the state of the OUTSET pin.
V
10°C Typical Hysteresis
4.2
MCP9510 OUTSET Input Pin
2°C Typical
Hysteresis
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-
T HYST
Cold
T SET
Hot
der and comparators to determine OUTSET level
threshold. Figure 4-2 shows the circuit configuration.
Temperature
The OUTSET input resistance must be carefully
considered for leakage current when connecting volt-
age source to change output configuration.
? 2008 Microchip Technology Inc.
FIGURE 4-3:
Output Hysteresis.
DS22114A-page 11
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