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| 型号： | MCP9502PT-095E/OT |
| 厂商： | Microchip Technology |
| 文件页数： | 9/20页 |
| 文件大小： | 0K |
| 描述： | IC TEMP SWITCH PROGR P-P SOT23-5 |
| 标准包装： | 1 |
| 感应温度： | 95°C 分界点 |
| 输出类型： | 高态有效/推挽式 |
| 电源电压： | 2.7 V ~ 5.5 V |
| 精确度： | ±1°C |
| 封装/外壳： | SC-74A，SOT-753 |
| 供应商设备封装： | SOT-23-5 |
| 包装： | 标准包装 |
| 其它名称： | MCP9502PT-095E/OTDKR |
MCP9501/2/3/4
4.1
Application Information
4.1.1
LAYOUT CONSIDERATION AND
The MCP9501/2/3/4 temperature switch family
integrates a temperature sensor and a comparator
circuit which outputs an alert signal when the factory
set temperature threshold is exceeded. No additional
component is required for device operation, which
provides simplicity to the system designer. The device
output options provide design flexibility for various
applications such as overtemperature protection circuit
or a closed loop temperature control unit. This device
can be interfaced to a closed loop fan controller
network without the need for a microcontroller.
THERMAL CONSIDERATION
This family of sensors measures temperature by
monitoring the voltage level of a thermal diode located
in the die. A low-impedance thermal path between the
die and the PCB is provided by the pins. Therefore, the
sensor effectively monitors PCB temperature. For
efficient performance, it is recommended to layout the
device as close to the heat source as possible.
When connecting an external resistor to the MCP9501/
3, the current through the pull-up resistor must be
considered to prevent self-heat due to power. This can
be determined using Equation 4-1 .
12V
EQUATION 4-1:
EFFECT OF
SELF-HEATING
5V DD
M
T J – T A = θ JA ( V DD × I DD + V OL × I OUT )
Where:
HYST
MCP9502
Output
T J
=
Junction Temperature
T A
θ JA
=
=
Ambient Temperature
Package Thermal Resistance
(220.7 °C/W)
FIGURE 4-3:
MCP9502.
Fan Controller Using
V OL
I OUT
=
=
Sensor Output Low Voltage
Output Current
The MCP9501/2/3/4 provide Open-Drain output where
multiple sensors from multiple PCB hot-spots can be
connected to a single processor I/O input with a wired-
OR configuration. The MCP9501 requires an external
pull-up resistor which can be used to level-shift the alert
signal. For example, if the sensors are powered with
5V DD and the controller or processor is powered with
3V DD , the external resistor can be level-shifted by
connecting 3V DD to the pull-up resistor as shown in
Figure 4-4 .
5V DD
3V DD
For example, at room temperature, when the output
asserts Active-Low and maximum I DD = 50 μA,
V DD = 5.5V, V OL = 0.3V and I OUT = 5 mA (see the
specification table), the self heating due to power
dissipation (T J - T A ) is ~0.4°C.
HYST
MCP9501 OUT
85°C
Micro-
controller
5V DD
HYST MCP9503 OUT
35°C
I/O
FIGURE 4-4:
MCP9501 Wired-OR Output
Configuration with Level-shift.
? 2011 Microchip Technology Inc.
DS22268A-page 9
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