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| 型号： | TMP302DDRLR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO6 |
| 封装： | 1.60 X 1.60 MM, 0.60 MM HEIGHT, GREEN, PLASTIC, SOT-563, 6 PIN |
| 文件页数： | 9/12页 |
| 文件大小： | 510K |
| 代理商： | TMP302DDRLR |
OUT
+50°C
+60°C
T
TRIP
V
DD
, TMP302B
, TMP302D
SBOS488A – JUNE 2009 – REVISED SEPTEMBER 2009................................................................................................................................................ www.ti.com
APPLICATION INFORMATION
The TMP302 temperature switch is optimal for
HYSTSET
ultralow-power
battery
applications
that
require
accurate trip thresholds. The trip thresholds are
If the temperature trip threshold is crossed, the
programmable to four different settings using the
open-drain output (OUT) goes low and does not
return to its original high state (that is, VS) until the
settings versus trip points.
temperature returns to a value within a hysteresis
window set by the HYSTSET pin. The HYSTSET pin
Table 1. Trip Point vs TRIPSET1 and TRIPSET0
allows the user to choose between a +5°C and a
+10°C
hysteresis
window.
shows
the
TRIPSET1
TRIPSET0
TMP302A
TMP302B
TMP302C
TMP302D
hysteresis window that corresponds to the HYSTSET
GND
+50°C
+70°C
+90°C
+110°C
setting.
GND
VS
+55°C
+75°C
+95°C
+115°C
Table 2. HYSTSET Window
VS
GND
+60°C
+80°C
+100°C
+120°C
VS
+65°C
+85°C
+105°C
+125°C
HYSTSET
THRESHOLD HYSTERESIS
GND
+5°C
The typical thermal response time for the TMP302 is
VS
+10°C
about 250ms. This period is the minimum time frame
that it takes for the open-drain output (OUT) to
For the specific case of the TMP302A, if the HYSTSET
change its state from low to high (or vice-versa) while
pin is set to +10°C (that is, connected to VS) and the
the device is active. A maximum low output voltage is
device is configured with a +60°C trip point (TRIPSET1
defined as a voltage level equivalent to 0.2 × VS;
= VS, TRIPSET0 = GND), once this threshold is
likewise, a minimum high output voltage is defined as
exceeded the output does not return to its original
0.8 × VS. It is important to note that an exception to
high state until it reaches +50°C. This case is more
the nominal 250ms response time occurs on power
clearly illustrated in Figure 9.
up—in this case, it is possible to achieve a thermal
response in as little as 35ms.
CONFIGURING THE TMP302
The TMP302 is simple to configure. The only external
components that it requires are a bypass capacitor
and pull-up resistor. Power-supply bypassing is
strongly recommended; use a 0.1F capacitor placed
as close as possible to the supply pin. To minimize
the internal power dissipation of the TMP302, use a
pull-up resistor value greater than 10k
Ω from OUT to
configuration. The TRIPSET pins can be toggled
dynamically; however, the voltage of these pins must
not exceed VS. To ensure a proper logic high, the
voltage must not drop below 0.7V × VS.
Figure 9. TMP302A; HYSTSET = VS; TRIPSET1 = VS,
TRIPSET0 = GND
6
Copyright 2009, Texas Instruments Incorporated
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相关代理商/技术参数 |
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