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TMP302C 데이터시트(PDF) 6 Page - Texas Instruments |
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TMP302C 데이터시트(HTML) 6 Page - Texas Instruments |
6 / 11 page OUT +50°C +60°C T TRIP V DD TMP302A , TMP302B TMP302C , 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 TRIPSET1 and TRIPSET0 pins. Table 1 shows the pin 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. Table 2 shows the TRIPSET1 TRIPSET0 TMP302A TMP302B TMP302C TMP302D hysteresis window that corresponds to the HYSTSET GND 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 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 0.1µF 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 VS. Refer to Table 1 for trip point temperature 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 Submit Documentation Feedback Copyright © 2009, Texas Instruments Incorporated Product Folder Link(s): TMP302A TMP302B TMP302C TMP302D |
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