The MAX6646/MAX6647/MAX6649 are precise, two-channel
digital temperature sensors. The devices accurately
measure the temperature of their own die and a
remote PN junction, and report the temperature in digital
form using a 2-wire serial interface. The remote PN junction
is typically the emitter-base junction of a common-collector
PNP on a CPU, FPGA, or ASIC.
The 2-wire serial interface accepts standard system management
bus (SMBus™) write byte, read byte, send byte,
and receive byte commands to read the temperature
data and to program the alarm thresholds. To enhance
system reliability, the MAX6646/MAX6647/MAX6649
include an SMBus timeout. A fault queue prevents the
active-low ALERT and active-low OVERT outputs from setting until a fault has
been detected one, two, or three consecutive times
(programmable).
The MAX6646/MAX6647/MAX6649 provide two system
alarms: active-low ALERT and active-low OVERT. Active-low ALERT asserts when any of four temperature conditions are violated: local overtemperature,
remote overtemperature, local undertemperature,
or remote undertemperature. Active-low OVERT asserts when
the temperature rises above the value in either of the two
active-low OVERT limit registers. The active-low OVERT output can be used to
activate a cooling fan, or to trigger a system shutdown.
Measurements can be done autonomously, at the programmed
conversion rate, or in a single-shot mode. The
adjustable conversion rate allows optimizing supply current
and temperature update rate to match system needs.
Remote accuracy is ±1°C maximum error between +60°C
and +145°C with no calibration needed. The MAX6646/MAX6647/MAX6649 operate from -55°C to +125°C, and measure temperatures between 0°C and +145°C. The MAX6646/MAX6647/MAX6649 are available in an 8-pin
µMAX® package.
Key Features
Applications/Uses
Dual Channel: Measures Remote and Local Temperature
0.125°C Resolution
High Accuracy ±1°C (max) from +60°C to +145°C
(Remote), and ±2°C (max) from +60°C to +100°C (Local)
Measures High-Ideality Thermal Diodes Up to
+170°C (Apparent)
+145°C (Real)
Two Alarm Outputs: Active-Low ALERT and Active-Low OVERT
Programmable Under/Overtemperature Alarm Temperature Thresholds
Notes: **This pricing is BUDGETARY, for comparing similar parts. Prices are in
U.S. dollars and subject to change. Quantity pricing may vary
substantially and international prices may differ due to local
duties, taxes, fees, and exchange rates. For volume-specific prices
and delivery, please see the price and availability page
or contact an authorized distributor.
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