MAX6653

Remote-Junction Temperature Sensor Within ±1Accuracy (+60to +100)
ACPI-Compatible Programmable Temperature Alarms
0.125Resolution Local and Remote-Junction Temperature Measurement
Programmable Temperature Offset for System Calibration
SMBus 2-Wire Serial Interface with Timeout
Automatic or Manual Fan-Speed Control
PWM Fan Control Output
Fan-Speed Monitoring and Watchdog
Fan Fault and Failure Indicators
Compatible with 2-Wire or 3-Wire Fans (Tachometer Output)
+3V to +5.5V Supply Range
Additional Shutdown Set Point (MAX6653)
Controlled PWM Rise/Fall Times

Personal Computers Servers Workstations Telecom Equipment Networking Equipment Test Equipment Industrial Controls

All Voltages Are Referenced to GND
TACH/AIN..............................................................-0.3V to +5.5V
VCC..........................................................................-0.3V to +6V
DXP, ADD, CRIT0, CRIT1..........................-0.3V to + (VCC + 0.3V)
DXN ......................................................................-0.3V to +0.8V
SMBDATA, SMBCLK, INT , THERM,
FAN_FAULT, SDL, SDR ..............................................-0.3V to +6V
SMBDATA, INT, THERM, FAN_FAULT,
PWM_OUT Current...............................................-1mA to +50mA
DXN Current ......................................................................±1mA
ESD Protection (all pins, Human Body Model) ....................2000V
Continuous Power Dissipation (TA = +70)
16-Pin QSOP (derate 8.3 mW/ above +70).................667mW
Operating Temperature Range ............................-40 to +125

Junction Temperature.........................................................+150

Storage Temperature Range .................................-65 to +165
Lead Temperature (soldering, 10s) .....................................+300

The MAX6653/MAX6663/MAX6664 are ACPI-compliant local and remote-junction temperature sensors and fan controllers. These devices measure their own die temperature, 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 temperature measurement accuracy of MAX6653 is ±1from +60 to +100. Temperature measurement resolution is 0.125for 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 theINTor THERM outputs. These outputs can be used as interrupts, clock throttle signals, or overtemperature shutdown signals. Two pins on the MAX6653 control the power-up values of the comparison set points, providing 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 to +125 temperature range.