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SS8018

±1°C Remote and Local Temperature Sensor

with SMBus Serial Interface

temperatures

±1°C (+60°C to +100°C, remote)

±3°C (+60°C to + 100°C, local)

320µA (typ)

The SS8018 is a precise digital thermometer that re-

ports 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 replaces a conventional thermistor or

thermocouple. Remote accuracy is ±1°C with no calibra-

tion needed. 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 corre-

sponding to 0.125°C, in two’s-complement format.

Measurements can be done automatically and autono-

mously, 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 SS8018 is available in a small 8-pin SOP sur-

face-mount package.

Desktop and Notebook

Central Office

Computers

Telecom Equipment

Smart Battery Packs

Test and Measurement

LAN Servers

Multi-Chip Modules

Industrial Controllers

PACKING TYPE

TR: TAPE & REEL

SS8018XX

Example: SS8018TR

à SS8018 shipped in

tape & reel packing

Rev.2.01 6/06/2003