MAX6695 Datasheet, PDF (1/20 Pages) Maxim Integrated Products – Dual Remote/Local Temperature Sensors with SMBus Serial Interface

19-3183; Rev 1; 5/04
Dual Remote/Local Temperature Sensors with
SMBus Serial Interface
General Description
The MAX6695/MAX6696 are precise, dual-remote, and
local digital temperature sensors. They accurately mea-
sure the temperature of their own die and two remote
diode-connected transistors, and report the tempera-
ture in digital form on a 2-wire serial interface. The
remote diode is typically the emitter-base junction of a
common-collector PNP on a CPU, FPGA, GPU, or ASIC.
The 2-wire serial interface accepts standard system
management bus (SMBus™) commands such as Write
Byte, Read Byte, Send Byte, and Receive Byte to read
the temperature data and program the alarm thresholds
and conversion rate. The MAX6695/MAX6696 can func-
tion autonomously with a programmable conversion
rate, which allows control of supply current and temper-
ature update rate to match system needs. For conver-
sion rates of 2Hz or less, the temperature is
represented as 10 bits + sign with a resolution of
+0.125°C. When the conversion rate is 4Hz, output data
is 7 bits + sign with a resolution of +1°C. The MAX6695/
MAX6696 also include an SMBus timeout feature to
enhance system reliability.
Remote temperature sensing accuracy is ±1.5°C be-
tween +60°C and +100°C with no calibration needed.
The MAX6695/MAX6696 measure temperatures from
-40°C to +125°C. In addition to the SMBus ALERT out-
put, the MAX6695/MAX6696 feature two overtempera-
ture limit indicators (OT1 and OT2), which are active
only while the temperature is above the corresponding
programmable temperature limits. The OT1 and OT2
outputs are typically used for fan control, clock throt-
tling, or system shutdown.
The MAX6695 has a fixed SMBus address. The
MAX6696 has nine different pin-selectable SMBus
addresses. The MAX6695 is available in a 10-pin
µMAX^® and the MAX6696 is available in a 16-pin QSOP
package. Both operate throughout the -40°C to +125°C
temperature range.
Applications
Notebook Computers
Desktop Computers
Servers
Workstations
Test and Measurement Equipment
SMBus is a trademark of Intel Corp.
I²C is a trademark of Philips Corp. Purchase of I²C components
from Maxim Integrated Products, Inc., or one of its sublicensed
Associated Companies, conveys a license under the Philips
I²C Patent Rights to use these components in an I²C system,
provided that the system conforms to the I²C Standard
Specification as defined by Philips.
Features
♦ Measure One Local and Two Remote
Temperatures
♦ 11-Bit, 0.125°C Resolution
♦ High Accuracy ±1.5°C (max) from +60°C to +100°C
(Remote)
♦ ACPI Compliant
♦ Programmable Under/Overtemperature Alarms
♦ Programmable Conversion Rate
♦ Three Alarm Outputs: ALERT, OT1, and OT2
♦ SMBus/I²C™-Compatible Interface
PART
MAX6695AUB
MAX6696AEE
Ordering Information
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
10 µMAX
16 QSOP
Typical Operating Circuit
0.1µF
+3.3V
47Ω
CPU
V_CC
DXP1
SMBDATA
SMBCLK
MAX6695 ^ALERT
DXN
OT1
OT2
10kΩ
EACH
DATA
CLOCK
INTERRUPT
TO µP
TO CLOCK
THROTTLING
TO SYSTEM
SHUTDOWN
DXP2
GND
GRAPHICS
PROCESSOR
Typical Operating Circuits continued at end of data sheet.
Pin Configurations appear at end of data sheet.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
________________________________________________________________ Maxim Integrated Products 1
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