CXHA3178 CXHA3179 is a precise digital thermometer that reports the temperature of both a remote sensor and its own package. The remote sensor is a diode-connected transistor typically a low-cost

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The CXHA3178 CXHA3179 is a precise digital thermometer that reports the temperature of both a remote sensor and its own package. The remote sensor is a diode-connected transistor typically a low-cost, easily mounted 2N3904 NPN type that replace conventional thermistors or thermocouples. Remote accuracy is ±1°C with no calibration needed. It also has a build-in noise filtering function in remote sensor measuring the diode temperature. The remote channel can also measure the die temperature of other ICs, such as microprocessors, that contain an on-chip, diode-connected transistor. 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. The data format is 11bits plus sign, with each bit corresponding to 0.125°C, in two’s-complement format. 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 rate allows the user to control the supply current drain. The CXHA3178 CXHA3179 is available in a small, 8-pin SOP, MSOP and TDFN surface-mount package.

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„ Two Channels: Measures Both Remote and Local Temperatures jhL嘉泰姆

„ Measure Thermal Diode with a Transistor Model jhL嘉泰姆

„ No Calibration Required jhL嘉泰姆

„ Built-in Noise-Buster for Remote Sensor jhL嘉泰姆

„ SMBus 2-Wire Serial Interface jhL嘉泰姆

„ Programmable Under/Overtemperature Alarms jhL嘉泰姆

„ Supports SMBus Alert Response jhL嘉泰姆

„ Accuracy: ±1°C (+60°C to +100°C, remote) ±3°C (+60°C to + 100°C, local) jhL嘉泰姆

„ 320μA (typ) Average Supply Current During Conversion jhL嘉泰姆

„ Measure Thermal Diode with Transistor Model jhL嘉泰姆

„ Support 45nm, 65nm and 90nm CPU thermal diode jhL嘉泰姆

„ +3V to +5.5V Supply Range jhL嘉泰姆

„ Small 8-Lead SOP , MSOP and TDFN Package jhL嘉泰姆

„ Remote Temperature Measurment up to 160°C by using offset shifting method (see “Measure Remote Temperature Higher Than 127°C” section)jhL嘉泰姆

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Desktop and Notebook jhL嘉泰姆

Central Office jhL嘉泰姆

Computers jhL嘉泰姆

Telecom Equipment jhL嘉泰姆

Smart Battery Packs jhL嘉泰姆

Test and Measurement jhL嘉泰姆

LAN Servers jhL嘉泰姆

Multi-Chip Modules jhL嘉泰姆

Industrial ControllersjhL嘉泰姆

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