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| 型号： | MAX6505UTP040+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 5/10页 |
| 文件大小： | 0K |
| 描述： | IC TEMP SWITCH DL TRIP SOT23-6 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 功能： | 温度开关 |
| 传感器类型： | 内部 |
| 感应温度： | 40°C 跳闸点 |
| 精确度： | ±3.5°C（最小值） |
| 拓扑： | 比较器，电压基准 |
| 输出类型： | 低态有效/开漏极 |
| 输出警报： | 是 |
| 输出风扇： | 是 |
| 电源电压： | 2.5 V ~ 5.5 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 |
| 供应商设备封装： | SOT-6 |
| 包装： | 带卷 (TR) |
Dual Trip SOT Temperature Switches
_______________Detailed Description
The MAX6505–MAX6508 fully integrated temperature
Table 1. MAX6505/MAX6506 ΔT AW
Selection Table
switches incorporate two temperature-dependent refer-
ences and a comparator. One reference exhibits a pos-
CONTROL PINS
DESCRIPTION
itive temperature coefficient and the other a negative
temperature coefficient. The temperature at which the
two reference voltages are equal determines the tem-
perature trip point. There are two versions, each of
which has two logic outputs.
The MAX6505/MAX6506 have a main trip point (T ALARM )
and a lower, “warning” trip point (T WARN ). When the die
S1
GND
GND
V CC
V CC
S0
GND
V CC
GND
V CC
T AW =T ALARM – T WARN
( ° C)
5
10
20
30
temperature rises above these trip points, the ALARM
and WARN outputs are asserted (Figure 1). The differ-
ence between the two trip points ( Δ T AW ) is pin selec-
table to +5°C, +10°C, +20°C, or +30°C by connecting
the two control pins (S0 and S1) high or low (Table 1).
MAX6505 has open-drain active-low outputs; MAX6506
has push-pull active-high outputs.
The MAX6507/MAX6508 have two factory-programmed
threshold temperatures (T OVER and T UNDER ) and two
outputs (OK and OVER). One output (OK) asserts
when the temperature is between T OVER and T UNDER .
The other output (OVER) asserts when the temperature
is above T OVER . Table 4 shows the hex codes to deter-
mine the part numbers associated with specific values
of T OVER and T UNDER . The first hex code indicates the
lower trip point (T UNDER ) and the second indicates the
higher trip point (T OVER ). For example, a part with T UN-
DER = -10°C and T OVER = +75°C will have the part
number MAX6508UTA04B (Table 4 and Figure 2).
MAX6507 has open-drain outputs; MAX6508 has push-
pull outputs.
Hysteresis Selection
The temperature threshold hysteresis for the ALARM
output of the MAX6505/MAX6506 is 2°C. The hysteresis
for the WARN output depends on the value of Δ T AW . If
Δ T AW is 5°C or 10°C (set by S0 and S1), WARN hys-
teresis is 5°C. If Δ T AW is 20°C or 30°C, WARN hystere-
sis is 10°C. MAX6507 and MAX6508 have pin-selectable
hysteresis of 2°C or 10°C for both OVER and OK out-
puts (Table 2).
Applications Information
Thermal Considerations
The MAX6505 –MAX6508 supply current is typically
30μA. When used to drive high-impedance loads, the
devices dissipate negligible power. Therefore, the die
temperature is essentially the same as the package
temperature. The key to accurate temperature monitor-
ing is good thermal contact between the MAX6505–
MAX6508 package and the device being monitored. In
HYSTERESIS ≈ 2°C
65°C
55°C
HYSTERESIS ≈ 5°C
WARN
ALARM
Figure 1. Temperature Response—MAX6505UTP065 Outputs,
Δ T AW = 10°C, and WARN Hysteresis ≈ 5°C
some applications, the SOT23 packages may be small
enough to fit underneath a socketed microprocessor
(μP), allowing the device to monitor the μP’s tempera-
ture directly. Use the monitor’s output to reset the μP,
assert an interrupt, or trigger an external alarm.
Accurate temperature monitoring depends on the ther-
mal resistance between the device being monitored
and the MAX6505–MAX6508 die.
The rise in die temperature due to self-heating is given
by the following formula:
Δ T J = P DISSIPATION ? θ JA
where P DISSIPATION is the power dissipated by the
MAX6505–MAX6508, and θ JA is the package’s thermal
resistance. The typical thermal resistance is 115°C/W for
the SOT23 package. To limit the effects of self-heating,
minimize the output currents. For example, if the
MAX6505 sinks 5mA, the output voltage is guaranteed to
be less than 0.5V. Therefore, an additional 2.5mW of
_______________________________________________________________________________________
5
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