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TMP411-Q1 Datasheet(PDF) 6 Page - Texas Instruments |
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TMP411-Q1 Datasheet(HTML) 6 Page - Texas Instruments |
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6 / 33 page  TMP411 SBOS383C − DECEMBER 2006 − REVISED MAY 2008 www.ti.com 6 APPLICATIONS INFORMATION The TMP411 is a dual-channel digital temperature sensor that combines a local die temperature measurement channel and a remote junction temperature measurement channel in a single MSOP-8 or SO-8 package. The TMP411 is Two-Wire- and SMBus interface-compatible and is specified over a temperature range of −40 °C to +125 °C. The TMP411 contains multiple registers for holding configuration information, temperature measurement results, temperature comparator maximum/minimum limits, and status information. User-programmed high and low temperature limits stored in the TMP411 can be used to trigger an over/under temperature alarm (ALERT) on local and remote temperatures. Additional thermal limits can be programmed into the TMP411 and used to trigger another flag (THERM) that can be used to initiate a system response to rising temperatures. The TMP411 requires only a transistor connected between D+ and D− for proper remote temperature sensing operation. The SCL and SDA interface pins require pull-up resistors as part of the communication bus, while ALERT and THERM are open-drain outputs that also need pull−up resistors. ALERT and THERM may be shared with other devices if desired for a wired-OR implementation. A 0.1 µF power-supply bypass capacitor is recommended for good local bypassing. Figure 11 shows a typical configuration for the TMP411. 0.1 µF 10k Ω (typ) 10k Ω (typ) 10k Ω (typ) 10k Ω (typ) TMP411 D+ D − V+ 1 8 7 6 4 5 3 2 R S (2) R S (2) C DIFF (3) C DIFF (3) R S (2) R S (2) GND SCL SDA ALERT/THERM2 THERM +5V SMBus Controller Fan Controller Diode−connected configuration(1): Series Resistance Transistor−connected configuration(1): (1) Diode−connected configuration provides better settling time. Transistor−connected configuration provides better series resistance cancellation. (2) R S (optional) should be < 1.5kΩ in most applications. Selection of RS depends on specific application; see Filtering section. (3) C DIFF (optional) should be < 1000pF in most applications. Selection of CDIFF depends on specific application; see Filtering section and Figure 6, Remote Temperature Error vs Differential Capacitance. NOTES: Figure 11. Basic Connections |
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