© 2008 Microchip Technology Inc. DS22114A-page 9
MCP9509/10
3.0 PIN DESCRIPTIONS
TABLE 3-1: PIN FUNCTION TABLE
3.1 External Resistor Input (SET)
This pin is used to connect a resistor between the SET
and GND pins to select the temperature trip point
(T
SET
). The resistor value can be determined either
from Equation 4-2 or the lookup table shown in
Table 4-2.
3.2 Ground (GND)
The GND pin is the system ground pin.
3.3 Hysteresis Input (HYS)
This is an input pin which can be connected to V
DD
or
GND to select output hysteresis. Either 2°C
(HYS = GND) or 10°C (HYS = V
DD
)
of hysteresis can
be selected.
3.4 Power Pin (V
DD
)
The operating voltage range, as specified in the DC
electrical specification table, is applied on this pin.
3.5 Open-Drain Output (OUT)
(MCP9509)
This output is triggered when temperature exceeds the
programmed trip temperature. This pin requires a
pull-up resistor.
3.6 Selectable Output (OUT, OUT)
(MCP9510)
The output pin can be configured as either a Push-Pull
Active-High, Push-Pull Active-Low, or an Open-drain
Output with an internal pull-up resistor. The three
output options of the MCP9510 are selected by the
OUTSET pin.
3.7 Output Control (OUTSET)
(MCP9510)
The OUTSET pin is used to select the desired
configuration of the OUT or OUT
pin.
TABLE 3-1: OUTSET SELECTABLE
OUTPUTS
MCP9509 MCP9510
Symbol Description
SOT-23-5 SOT-23-6
1 1 SET External Trip Temperature Resistor (R
SET
) input
2 2 GND Ground
3—OUT
Open-drain output
—3OUT,
OUT
Selectable Output pin,
function set by OUTSET pin
4 4 HYS Hysteresis Input
HYS = GND, hysteresis is 2°C
HYS = V
DD
, hysteresis is 10°C
56V
DD
Power pin
— 5 OUTSET Output Control
OUTSET = GND, Active-Low, Push-Pull
OUTSET = V
DD
, Active-High, Push-Pull
OUTSET = Unconnected, Active-Low, Open-Drain with an internal pull-up
OUTSET Pin
OUT / OUT Pin
GND Push-Pull, Active-Low
V
DD
Push-Pull, Active-High
unconnected
(i.e. open)
Open-Drain output with an
internal pull-up resistor of
100 kΩ (typical)
