Datasheet

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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.

Applications

Personal Computers

Servers

Workstations

Telecom Equipment

Networking Equipment

Test Equipment

Industrial Controls

Features

♦ Remote-Junction Temperature Sensor Within

±1°C Accuracy (+60°C to +100°C)

♦ ACPI-Compatible Programmable Temperature

Alarms

♦ 0.125°C Resolution 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

MAX6653/MAX6663/MAX6664

Temperature Monitors and

PWM Fan Controllers

________________________________________________________________ Maxim Integrated Products 1

PWM_OUT

SMBCLK

SMBDATA

INT

ADD

SDR

SDL

DXP

DXN

TOP VIEW

MAX6653

QSOP

TACH/AIN

CRT0

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 Maxim’s website at www.maxim-ic.com.

Ordering Information

PART TEMP RANGE PIN-PACKAGE

MAX6653AEE -40°C to +125°C 16 QSOP

MAX6663AEE -40°C to +125°C 16 QSOP

MAX6664AEE -40°C to +125°C 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.

Summary of content (24 pages)

PAGE 1
9-2865; Rev 1; 12/03 Temperature Monitors and PWM Fan Controllers 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 interrupts, clock throttle signals, or overtemperature shutdown signals.
PAGE 2
MAX6653/MAX6663/MAX6664 Temperature Monitors and PWM Fan Controllers ABSOLUTE MAXIMUM RATINGS 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.
PAGE 3
Temperature Monitors and PWM Fan Controllers MAX6653/MAX6663/MAX6664 ELECTRICAL CHARACTERISTICS (continued) (VCC = +3.0V to +5.5V, TA = 0°C to +125°C, unless otherwise noted. Typical values are at VCC = +3.3V, TA = +25°C.) (Note1) PARAMETER SYMBOL CONDITIONS MIN Temperature Conversion Time TYP MAX 250 Conversion Rate Timing Error Remote-Diode Sourcing Current UNITS ms (Note 2) 25 25 High level 80 100 120 Low level 8 10 12 % µA DXN Source Voltage 0.
PAGE 4
Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) 4.0 3.5 3.0 1.5 TEMPERATURE ERROR (°C) 400 350 300 250 200 150 100 2.5 0 3.5 4.0 4.5 5.0 -0.5 -1.0 1 2 3 4 -40 -25 -10 5 20 35 50 65 80 95 110 125 CONVERSION RATE (Hz) REMOTE-DIODE TEMPERATURE (°C) LOCAL TEMPERATURE ERROR vs. DIE TEMPERATURE REMOTE TEMPERATURE ERROR vs. POWER-SUPPLY NOISE FREQUENCY LOCAL TEMPERATURE ERROR vs. POWER-SUPPLY NOISE FREQUENCY 1.0 0.5 0 -0.5 -1.0 250mVP-P 8 7 6 5 4 3 100mVP-P 2 -1.
PAGE 5
Temperature Monitors and PWM Fan Controllers PIN MAX6653 QSOP MAX6663/ MAX6664 QSOP NAME 1 1 PWM_OUT Digital Output (Open Drain). Pulse-width modulated output to external power transistor. Requires a pullup resistor (10kΩ typ). 2 2 TACH/AIN Digital/Analog Input. Fan tachometer input. May be reprogrammed as an analog input to measure speed of a 2-wire fan. See Figure 5. 3 — CRIT0 Input. Used in conjunction with CRIT1 to set THERM and SHUTDOWN default set points (see Table 1).
PAGE 6
MAX6653/MAX6663/MAX6664 Temperature Monitors and PWM Fan Controllers Table 1.
PAGE 7
Temperature Monitors and PWM Fan Controllers MAX6653/MAX6663/MAX6664 Write Byte Format S ADDRESS WR ACK COMMAND 7 bits ACK DATA 8 bits Slave Address: equivalent to chip-select line of a 3-wire interface ACK P 8 bits Command Byte: selects which register you are writing to Data Byte: data goes into the register set by the co mma nd byte ( to se t thresholds, configuration masks, and sampling rate) Read Byte Format S WR ADDRESS ACK COMMAND 7 bits ACK S Slave Address: equivalent to chip-
PAGE 8
MAX6653/MAX6663/MAX6664 Temperature Monitors and PWM Fan Controllers A tLOW B tHIGH C D E F G H I J K L M SMBCLK SMBDATA tSU:STA tHD:STA A = START CONDITION B = MSB OF ADDRESS CLOCKED INTO SLAVE C = LSB OF ADDRESS CLOCKED INTO SLAVE D = R/W BIT CLOCKED INTO SLAVE E = SLAVE PULLS SMBDATA LINE LOW tSU:DAT tHD:DAT tSU:STO tBUF J = ACKNOWLEDGE CLOCKED INTO SLAVE K = ACKNOWLEDGE CLEAR PULSE L = STOP CONDITION, EXECUTED BY SLAVE M = NEW START CONDITION F = ACKNOWLEDGE BIT CLOCKED INTO MAST
PAGE 9
Temperature Monitors and PWM Fan Controllers MAX6653/MAX6663/MAX6664 Table 4. Temperature Data Low Byte Format Structure: LLLXXRRR* FRACTIONAL TEMPERATURE (°C) DIGITAL OUTPUT (LOCAL) DIGITAL OUTPUT (REMOTE) 0.000 000X XXXX XXX XX 000 0.125 001X XXXX XXX XX 001 0.25 010X XXXX XXX XX 010 0.375 011X XXXX XXX XX 011 XXX XX 100 0.5 100X XXXX 0.625 101X XXXX XXX XX 101 0.75 110X XXXX XXX XX 110 0.
PAGE 10
MAX6653/MAX6663/MAX6664 Temperature Monitors and PWM Fan Controllers INT is an open-drain digital output that reports the status of temperature interrupt limits and fan out-of-limit conditions. Set bit 1 of configuration register 1 (00h) to 1 to enable INT output or reset this bit to zero to disable the INT output function. Status register 1 contains status information for the conditions that cause INT to assert.
PAGE 11
Temperature Monitors and PWM Fan Controllers BITS [3:0] OF FAN-SPEED CONFIGURATION REGISTER (22h) % DUTY CYCLE (%) BIT 3 BIT 2 BIT 1 BIT 0 0 0 0 0 0 0 0 1 7 0 0 1 0 14 0 0 1 1 20 0 1 0 0 27 0 1 0 1 33 0 1 1 0 40 0 1 1 1 47 1 0 0 0 53 1 0 0 1 60 1 0 1 0 67 1 0 1 1 73 1 1 0 0 80 1 1 0 1 87 1 1 1 0 93 1 1 1 1 100 0 Automatic Fan-Control Mode Automatic fan-speed control is selected by setting bits [7:5] of configuration regist
PAGE 12
MAX6653/MAX6663/MAX6664 Temperature Monitors and PWM Fan Controllers Table 12. Spin-Up Time; Bits [2:0] Fan Characteristics Register (20h)—POR = 101 BIT 2 BIT 1 BIT 0 SPIN-UP TIME (s) 0 0 0 0.2 0 0 1 0.4 0 1 0 0.6 0 1 1 0.8 1 0 0 1 1 0 1 2 1 1 0 4 1 1 1 8 Table 13. Fan Filter Ramp Rate; Bits [6:5] Fan Filter Register (23h)—POR = 10; BIT 6 BIT 5 RAMP RATE (x100% / 240) RAMP RATE (% DUTY CYCLE) 0 0 1 0.416 0 1 2 0.833 1 0 4 1.667 1 1 8 3.
PAGE 13
Temperature Monitors and PWM Fan Controllers Fan-Fault Detection The FAN_FAULT output is used to indicate fan slow down or failure. POR disables the FAN_FAULT output on the MAX6653/MAX6663. POR enables FAN_FAULT output on the MAX6664. If FAN_FAULT is not enabled, writing a logic 1 to bit 4 of configuration register 1 (00h) enables the FAN_FAULT output pin. Either underspeed or stalled fans are detected as fan faults.
PAGE 14
MAX6653/MAX6663/MAX6664 Temperature Monitors and PWM Fan Controllers Alarm Speed memory buses, and ISA/PCI buses. For the MAX6663, the alarm speed bit, bit 0 of status register 1 (02h), indicates that the PWM duty cycle is 100%, excluding the case of fan spin-up. For the MAX6653/MAX6664, this bit indicates that the THERM output is low. Once this bit is set, the only way to clear it is by reading status register 1.
PAGE 15
Temperature Monitors and PWM Fan Controllers Addr(H) READ/WRITE POR STATE MAX6653 0000 1001 00 R/W MAX6663 00000001 MAX6664 10010001 01 R/W 0111 1111 DESCRIPTION Configuration register 1: Bits [7:5]: Setting the fan-speed control mode: Bit 7 = 1: Enables automatic fan-speed control mode. Bits [6:5] = 00: Remote temperature controls the fan speed. Bits [6:5] =11: Both remote and local temperature control the fan speed. Bit 7 = 0, Enables PWM control mode or RPM control mode.
PAGE 16
MAX6653/MAX6663/MAX6664 Temperature Monitors and PWM Fan Controllers Register Summary (continued) Addr(H) 02 03 16 READ/WRITE POR STATE R R DESCRIPTION 0000 0000 Status register 1: Bit 7: Local temp low: 1: Local temp low interrupt limit has been exceeded. This bit is cleared by reading status register 1 for the MAX6653/MAX6663/MAX6664 or completing an alert response protocol for the MAX6664. This bit is asserted on the next cycle if the local temperature is still less than the limit.
PAGE 17
Temperature Monitors and PWM Fan Controllers Addr(H) READ/WRITE POR STATE DESCRIPTION 0A R 0001 1110 (30°C) Local temperature data: This register contains the 8 MSBs of the local temperature measurement. 0B R 0001 1110 (30°C) Remote temperature data: This register contains the 8 MSBs of the local temperature measurement. 0000 0000 Local temperature offset: Bit 7: Sign bit; when zero, the offset value in bits [3:0] is added to the measured local temperature reading.
PAGE 18
MAX6653/MAX6663/MAX6664 Temperature Monitors and PWM Fan Controllers Register Summary (continued) Addr(H) 20 READ/WRITE POR STATE R/W 0101 1101 MAX6653/ MAX6664 22 R/W 01010101 MAX6663 01011111 18 DESCRIPTION Fan characteristics register: Bits [7:6]: N factor: These bits contain the N factor for the fan-speed range: 00 = 1 (fail speed =2647RPM) 01 = 2 (fail speed =1324RPM) (default) 10 = 4 (fail speed = 662RPM) 11 = 8 (fail speed = 331RPM) Bits [5:3]: PWM frequency: These bits contain the nominal
PAGE 19
Temperature Monitors and PWM Fan Controllers Addr(H) READ/WRITE POR STATE 23 R/W 0101 1101 24 R/W 0100 0001 25 R/W 0110 0001 DESCRIPTION Fan filter register: Bit 7: Fan spin-up disable: 0: Spin-up enabled; 1: spin-up disabled. Bits [6:5]: Fan ramp rate: These bits set the amount the PWM duty cycle can change on each monitoring cycle: 00 = 1 (0.416%) 01 = 2 (0.833%) 10 = 4 (1.667%) (default) 11 = 8 (3.333%) Bits [4:2]: Temperature measurement rate (see Table 5). Bit 1: Unused.
PAGE 20
MAX6653/MAX6663/MAX6664 Temperature Monitors and PWM Fan Controllers Register Summary (continued) Addr(H) READ/WRITE POR STATE DESCRIPTION 3D R 0011 1000 Device ID 3E R 0100 1101 Manufacturer ID 1000 0000 THERM behavior/revision: Bit [7]: THERM behavior: 1: enable THERM as an output. 0: disable THERM as an output. Bits [3:0] revision number. *For MAX6663 bit 7 has to be 1 all the time.
PAGE 21
Temperature Monitors and PWM Fan Controllers Manufacturers of discrete transistors do not normally specify or guarantee ideality factor. This is normally not a problem since good-quality discrete transistors tend to have ideality factors that fall within a relatively narrow range. We have observed variations in remote temperature readings of less than ±2°C with a variety of discrete transistors.
PAGE 22
Temperature Monitors and PWM Fan Controllers MAX6653/MAX6663/MAX6664 Typical Operating Circuits (continued) +3.3V +5V +3.3V 3-WIRE FAN 10kΩ 2.2kΩ +3.3V +3.3V 2.2kΩ CLOCK 10kΩ 1 PWM_OUT SMBCLK TACH/AIN SMBDATA DATA 16 NDT3055L +3.3V 2 15 10kΩ 3 N.C. INT INTERRUPT TO µC 14 +3.3V 4 +3.3V 5 N.C. GND MAX6663 MAX6664 ADD N.C. 13 12 +3.3V 6 VCC N.C. THERM DXP 11 10kΩ THERM SIGNAL TO THROTTLE CPU CLOCK 7 CPU 10 +3.3V 2.
PAGE 23
Temperature Monitors and PWM Fan Controllers VCC TACH SIGNAL CONDITIONING TACH/AIN SMBCLK SMBus INTERFACE SLAVE ADDRESS DECODER ADD SMBDATA TACHOMETER REGISTER BANK DXP ANALOG MUX DXN ADC INTERNAL TEMPERATURE SENSOR PWM_OUT TEMPERATURE MEASUREMENT BANDGAP REFRENCE (CRIT1) SHUTDOWN AND THERM LIMIT DECODER MUX (CRIT0) INT THERM FAN_FAULT (SDL) (SDR) PWM OUTPUT CONTROLLER ALU ( ) ARE FOR MAX6653 ONLY GND Pin Configurations (continued) Chip Information TRANSISTOR COUNT: 27,074 PROCES
PAGE 24
Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) QSOP.EPS MAX6653/MAX6663/MAX6664 Temperature Monitors and PWM Fan Controllers PACKAGE OUTLINE, QSOP .150", .025" LEAD PITCH 21-0055 E 1 1 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.