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參數(shù)資料
| 型號(hào)： | MAX6502 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | Ultra Small Temperature Switch with Pin-Selectable Hysteresis(超小型溫度開(kāi)關(guān)（引腳可選擇磁滯）) |
| 中文描述： | 低成本、+2.7V至+5.5V、微功耗溫度開(kāi)關(guān)，SOT23及TO-220封裝 |
| 文件頁(yè)數(shù)： | 3/12頁(yè) |
| 文件大?。?/td> | 61K |
| 代理商： | MAX6502 |
MAX6501, MAX6502
http://onsemi.com
3
PIN DESCRIPTION
MAX6501
MAX6502
Name
Description
1,2
1,2
GND
Ground. Ground both pins together close to the chip. Pin 2 provides the lowest thermal
resistance to the die.
3
3
HYST
Hysteresis Input. Connect HYST to GND for +2
°
C hysteresis, or connect to V
CC
for +10
°
C
hysteresis.
4
4
V
CC
Supply Input (+2.7 V to +5.5 V). Recommend 100 pF or greater Coupling capacitor from V
CC
to GND.
5
–
TOVER
Open–Drain, Active–Low Output. TOVER goes low when the die temperature exceeds the
factory–programmed temperature threshold. Connect to a 100 K
pull–up resistor. May be
pulled up to a voltage higher than V
CC
.
–
5
TOVER
Push/Pull Active–High Output. TOVER goes high when the die temperature exceeds the
factory–programmed temperature threshold.
Typical Operating Circuit
GND
MAX6502
GND
V
CC
V
CC
GND HYST
TOVER
INT
μ
P
100 pF
+2.7 V to +5.5 V
DETAILED DESCRIPTION
The MAX6501 and MAX6502 integrate a temperature
sensor with a factory–programmed threshold switch. A logic
signal is asserted when the die temperature crosses the factory
programmed threshold. An external hysteresis input pin
allows the user to select either 2
°
C or 10
°
C hysteresis to give
further flexibility to the design of the application. The
MAX6501 and MAX6502 are intended for a temperature
range from 45
°
C to 115
°
C in a 10
°
C increment. The
MAX6501 has an open drain output and the MAX6502 has
a push/pull output stage.
The MAX6501 is intended for applications with a
microprocessor reset input. The MAX6502 is intended for
applications of turning on a fan or heater element.
Hysteresis Input
To prevent the output from “chattering’’ at or near the trip
point temperature, a selectable HYST input pin is provided.
Hysteresis can be externally selected at 2
°
C (HYST = GND)
or 10
°
C (HYST = V
DD
) by means of the CMOS compatible
HYST input pin. Do not let the HYST pin float as this could
cause increase supply current. The hysteresis does not
depend on the part’s programmed trip threshold.
Table 1. Factory–Programmed Threshold Range
Part Number
Threshold (T
TH
) Range
MAX6501
+45
°
C
T
TH
+115
°
C
MAX6502
+45
°
C
T
TH
+115
°
C
Thermal Considerations
With a very low 17
μ
A supply current, the MAX6501 and
MAX6502 dissipates very little power. Thus, the die
temperature is basically the same as the package
temperature. To minimize the error in temperature readings,
the load current should be limited to a few milliamps. As an
example, the typical thermal resistance of a 5–Pin SOT–23A
package is 140
°
C/W. If the MAX6501 had to sink 1.0 mA,
and the output voltage is guaranteed to be less than 0.3 V,
then an additional 0.3 mW of power is dissipated within the
IC. This corresponds to a 0.042
°
C rise in die temperature in
the 5–Pin SOT–23A.
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