General Description
The MAX6653/MAX6663/MAX6664 are ACPI-compliant
local and remote-junction temperature sensors and fan
controllers. These devices measure their own die tem-
perature, as well as the temperature of a remote-PN
junction and control the speed of a DC cooling fan
based on the measured temperature. Remote tempera-
ture measurement accuracy is ?癈 from +60癈 to
+100癈. Temperature measurement resolution is
0.125癈 for both local and remote temperatures.
Internal watchdog set points are provided for both local
and remote temperatures. There are two comparison
set points for local temperatures and two for remote
temperatures. When a set point is crossed, the
MAX6653/MAX6663/MAX6664 assert either the INT or
THERM outputs. These outputs can be used as inter-
rupts, clock throttle signals, or overtemperature shut-
down signals. Two pins on the MAX6653 control the
power-up values of the comparison set points, provid-
ing fail-safe protection even when the system is unable
to program the trip temperatures. The MAX6653 has
two additional shutdown outputs, SDR and SDL, that
are triggered when the remote or local temperatures
exceed the programmed shutdown set points. The INT
output for the MAX6653/MAX6663 and THERM outputs
for the MAX6653/MAX6663/MAX6664 can also function
as inputs if either is pulled low to force the fan to full
speed, unless this function is masked by the user.
The MAX6653/MAX6663/MAX6664 are available in
16-pin QSOP packages and operate over the -40癈 to
+125癈 temperature range.
Applications
Personal Computers
Servers
Workstations
Telecom Equipment
Networking Equipment
Test Equipment
Industrial Controls
Features
o Remote-Junction Temperature Sensor Within
?癈 Accuracy (+60癈 to +100癈)
o ACPI-Compatible Programmable Temperature
Alarms
o 0.125?/SPAN>C Resolution Local and Remote-Junction
Temperature Measurement
o Programmable Temperature Offset for System
Calibration
o SMBus 2-Wire Serial Interface with Timeout
o Automatic or Manual Fan-Speed Control
o PWM Fan Control Output
o Fan-Speed Monitoring and Watchdog
o Fan Fault and Failure Indicators
o Compatible with 2-Wire or 3-Wire Fans
(Tachometer Output)
o +3V to +5.5V Supply Range
o Additional Shutdown Set Point (MAX6653)
o Controlled PWM Rise/Fall Times
Temperature Monitors and
PWM Fan Controllers
________________________________________________________________ Maxim Integrated Products 1
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
PWM_OUT
SMBCLK
SMBDATA
INT
ADD
SDR
SDL
DXP
DXN
TOP VIEW
MAX6653
QSOP
TACH/AIN
CRT0
V
CC
CRT1
GND
THERM
FAN_FAULT
Pin Configurations
19-2865; Rev 1; 12/03
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxims website at www.maxim-ic.com.
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX6653AEE
-40癈 to +125癈
16 QSOP
MAX6663AEE
-40癈 to +125癈
16 QSOP
MAX6664AEE
-40癈 to +125癈
16 QSOP
Typical Operating Circuits appear at end of data sheet.
Functional Diagram appears at end of data sheet.
Pin Configurations continued at end of data sheet.
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