MAX6653 Datasheet, PDF (1/24 Pages) Maxim Integrated Products – Temperature Monitors and PWM Fan Controllers

19-2865; Rev 1; 12/03
Temperature Monitors and
PWM Fan Controllers
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 ±1°C from +60°C to
+100°C. Temperature measurement resolution is
0.125°C 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°C to
+125°C temperature range.
Features
o Remote-Junction Temperature Sensor Within
±1°C Accuracy (+60°C to +100°C)
o ACPI-Compatible Programmable Temperature
Alarms
o 0.125°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
PART
MAX6653AEE
MAX6663AEE
MAX6664AEE
Ordering Information
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
16 QSOP
16 QSOP
16 QSOP
Personal Computers
Servers
Workstations
Telecom Equipment
Networking Equipment
Test Equipment
Industrial Controls
Applications
Typical Operating Circuits appear at end of data sheet.
Functional Diagram appears at end of data sheet.
Pin Configurations
TOP VIEW
PWM_OUT ₁
TACH/AIN 2
CRT0 3
CRT1 4
GND 5
V_CC 6
THERM 7
FAN_FAULT 8
MAX6653
16 SMBCLK
15 SMBDATA
14 INT
13 ADD
12 SDR
11 SDL
10 DXP
9 DXN
QSOP
Pin Configurations continued at end of data sheet.
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