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MAX6654 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX6654 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 16 page General Description The MAX6654† is a precise digital thermometer that reports the temperature of both a remote P-N junction and its own die. The remote junction can be a diode-con- nected transistor—typically a low-cost, easily mounted 2N3904 NPN type or 2N3906 PNP type—that replaces conventional thermistors or thermocouples. Remote accuracy is ±1°C for multiple transistor manufacturers, with no calibration needed. The remote junction can also be a common-collector PNP, such as a substrate PNP of a microprocessor (µP). The 2-wire serial interface accepts standard System Management Bus (SMBus)TM, Write Byte, Read Byte, Send Byte, and Receive Byte commands to program the alarm thresholds and to read temperature data. Measurements can be done automatically and autonomously, with the conversion rate programmed by the user, or programmed to operate in a single-shot mode. The adjustable conversion rate allows the user to optimize supply current and temperature update rate to match system needs. When the conversion rate is faster than 1Hz, the conversion results are available as a 7-bit- plus-sign byte with a 1°C LSB. When the conversion rate is 1Hz or slower, the MAX6654 enters the extended mode. In this mode, 3 additional bits of temperature data are available in the extended resolution register, provid- ing 10-bit-plus-sign resolution with a 0.125°C LSB. Single-shot conversions also have 0.125°C per LSB reso- lution when the conversion rate is 1Hz or slower. A parasitic resistance cancellation (PRC) mode can also be invoked for conversion rates of 1Hz or slower by set- ting bit 4 of the configuration register to 1. In PRC mode, the effect of series resistance on the leads of the external diode is canceled. The 11-bit conversion in PRC mode is performed in <500ms and is disabled for conversion rates faster than 1Hz. The one-shot conversion is also 11 bits in <500ms. The MAX6654 default low-temperature measurement limit is 0°C. This can be extended to -64°C by setting bit 5 of the configuration register to 1. The MAX6654 is available in a small, 16-pin QSOP sur- face-mount package. ________________________Applications Features o High Accuracy ±1°C (max) from +70°C to +100°C (Remote) o 11-Bit, 0.125°C Resolution o Dual Channel: Measures Remote and Local Temperature o No Calibration Required o Programmable Under/Overtemperature Alarms o I2C™-Compatible/SMBus Interface o +3V to +5.5V Supply Range 1°C Accurate Remote/Local Temperature Sensor with SMBus Serial Interface ________________________________________________________________ Maxim Integrated Products 1 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 N.C. N.C. STBY SMBCLK N.C. SMBDATA ALERT ADD0 N.C. TOP VIEW MAX6654 QSOP VCC DXP ADD1 DXN N.C. GND GND Pin Configuration VCC DXP CPU DXN STBY 10k EACH CLOCK DATA INTERRUPT TO µC +3V TO +5V SUPPLY 200 Ω 0.1 µF SMBCLK SMBDATA ALERT GND ADD0 ADD1 2200pF MAX6654 Typical Operating Circuit 19-1836; Rev 2; 1/02 Ordering Information Desktop Computers Notebook Computers Servers Thin Clients Workstations Test and Measurement Multichip Modules SMBus is a trademark of Intel Corp. I2C is a trademark of Philips Corp. †Patents pending PART TEMP. RANGE PIN-PACKAGE MAX6654MEE -55 °C to +125°C 16 QSOP For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. |
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