CXHA3182 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

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General Description The CXHA3182 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 CXHA3182 and CXHA3182-1 have the same functions but different SMBus slave addresses. This allows for one of each to be on the bus at the same time. The CXHA3182 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 1od嘉泰姆

„ No Calibration Required 1od嘉泰姆

„ Built-in Noise-Buster for Remote Sensor 1od嘉泰姆

„ SMBus 2-Wire Serial Interface 1od嘉泰姆

„ Programmable Under/Overtemperature Alarms 1od嘉泰姆

„ Supports SMBus Alert Response 1od嘉泰姆

„ Accuracy: ±1°C (+60°C to +100°C, remote) ±3°C (+60°C to + 100°C, local) „ 320μA (typ) Average Supply Current During Conversion 1od嘉泰姆

„ +3V to +5.5V Supply Range 1od嘉泰姆

„ Small 8-Lead SOP , MSOP and TDFN Package 1od嘉泰姆

„ Remote Temperature Measurment up to 160°C by using offset shifting method (see “Measure Remote Temperature Higher Than 127°C” section) 1od嘉泰姆

 „ SMBus Inputs with Built-in MOS Switch to Prevent Reverse Current from Bus to IC VCC1od嘉泰姆

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