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MAX6654：精度为1°C的远端/本地温度传感器，带有SMBus串行接口

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-connected 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), 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, providing 10-bit-plus-sign resolution with a 0.125°C LSB. Singleshot conversions also have 0.125°C per LSB resolution 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 setting 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 surface-mount package.

关键特性 High Accuracy ±1°C (max) from +70°C to +100°C (Remote) 11-Bit, 0.125°C Resolution Dual Channel: Measures Remote and Local Temperature No Calibration Required Programmable Under/Overtemperature Alarms I2C-Compatible/SMBus Interface +3V to +5.5V Supply Range

MAX6654：典型工作电路 应用 计算机：台式机、工作站和服务器 多芯片模块 笔记本电脑 服务器 测试与测量设备 瘦客户机 工作站

数据手册DataSheet

关键参数

开发工具

• MAX6654EVSYS

技术资料

• Understanding Multidrop Address Assignments for Thermal Sensors
• Compensating for Ideality Factor and Series Resistance Differences between Thermal-Sense Diodes

质量和环境数据

• MAX6654.pdf

相关产品

• MAX1617A：远端/本地温度传感器，带有SMBus串行接口
• MAX1617：远端/本地温度传感器，带有SMBus串行接口

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