MAX6660AEE+ Maxim Integrated Products, MAX6660AEE+ Datasheet

IC REG FAN SPEED 16-QSOP

MAX6660AEE+

Manufacturer Part Number
MAX6660AEE+
Description
IC REG FAN SPEED 16-QSOP
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX6660AEE.pdf (21 pages)

Specifications of MAX6660AEE+

Function
Fan Control, Temp Monitor
Topology
ADC, Comparator, Fan Control, Multiplexer, Register Bank
Sensor Type
External
Sensing Temperature
External Sensor
Output Type
I²C™/SMBus™
Output Alarm
Yes
Output Fan
Yes
Voltage - Supply
3 V ~ 5.5 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
16-QSOP
Full Temp Accuracy
+/- 5 C
Digital Output - Bus Interface
Serial (2-Wire)
Digital Output - Number Of Bits
10 bit + Sign
Maximum Operating Temperature
+ 125 C
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX6660 is a remote temperature sensor and fan-
speed regulator that provides a complete fan-control
solution. The remote temperature sensor is typically a
common-collector PNP, such as a substrate PNP of a
microprocessor, or a diode-connected transistor, typi-
cally a low-cost, easily mounted 2N3904 NPN type or
2N3906 PNP type.
The device also incorporates a closed-loop fan con-
troller that regulates fan speed with tachometer feed-
back. The MAX6660 compares temperature data to a
fan threshold temperature and gain setting, both pro-
grammed over the SMBus™ by the user. The result is
automatic fan control that is proportional to the remote-
junction temperature. The temperature feedback loop
can be broken at any time for system control over the
speed of the fan.
Fan speed is voltage controlled as opposed to PWM
controlled, greatly reducing acoustic noise and maxi-
mizing fan reliability. An on-chip power device drives
fans rated up to 250mA.
Temperature data is updated every 0.25s and is read-
able at any time over the SMBus interface. The
MAX6660 is accurate to 1°C (max) when the remote
junction is between +60°C to +100°C. Data is formatted
as a 10-bit + sign word with 0.125°C resolution.
The MAX6660 is specified for -40°C to +125°C and is
available in a 16-pin QSOP package.
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.
19-2225; Rev 1; 5/06
SMBus is a trademark of Intel Corp.
Pin Configuration appears at end of data sheet.
PC
Notebooks
Telecom Systems
Industrial Control Systems
Servers
Workstations
Fan-Speed Regulator with SMBus Interface
Remote-Junction Temperature-Controlled
________________________________________________________________ Maxim Integrated Products
General Description
Applications
♦ Integrated Thermal Sensing and Fan-Regulation
♦ Programmable Fan Threshold Temperature
♦ Programmable Temperature Range for Full-Scale
♦ Accurate Closed-Loop Fan-Speed Regulation
♦ On-Chip Power Device Drives Fans Rated
♦ Programmable Under/Overtemperature Alarms
♦ SMBus 2-Wire Serial Interface with Timeout
♦ Supports SMBus Alert Response
♦ ACPI Compatible, Including OVERT System
♦ ±1°C (+60°C to +100°C) Thermal-Sensing Accuracy
♦ MAX6660EVKIT Available
MAX6660AEE
Solution
Fan Speed
Up to 250mA
(Cannot “Lock Up” the SMBus)
Shutdown Function
1µF
PENTIUM
PART
FAN
5kΩ
2200pF
+12V
Typical Operating Circuit
-40°C to +125°C
TEMP RANGE
TACH IN
FAN
DXP
DXN
AGND
ADD0
VFAN
0.1µF
MAX6660
Ordering Information
V
CC
ADD1
STBY
SMBDATA
PGND
SMBCLK
OVERT
ALERT
50Ω
+3V TO +5.5V
16 QSOP
PIN-
PACKAGE
Features
10kΩ
EACH
CLOCK
DATA
INTERUPT
TO µP
TO SYSTEM
SHUTDOWN
E16-5
CODE
PKG
1

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MAX6660AEE+ Summary of contents

Page 1

... Industrial Control Systems Servers Workstations SMBus is a trademark of Intel Corp. Pin Configuration appears at end of data sheet. ________________________________________________________________ Maxim Integrated Products 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. ♦ Integrated Thermal Sensing and Fan-Regulation Solution ♦ ...

Page 2

Remote-Junction Temperature-Controlled Fan-Speed Regulator with SMBus Interface ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND ADD0, ADD1, SMBDATA, CC ALERT, OVERT ...................................-0.3V to +6V SMBCLK TACH IN, FAN .............................................-0.3V to +16V FAN DXP, GAIN..................................................-0. ...

Page 3

Remote-Junction Temperature-Controlled Fan-Speed Regulator with SMBus Interface ELECTRICAL CHARACTERISTICS (continued +3V to +5.5V +12V VFAN T = +25°C.) (Note 1) A PARAMETER SYM Tach Input Transition Level Tach Input Hysteresis Current-Sense ...

Page 4

Remote-Junction Temperature-Controlled Fan-Speed Regulator with SMBus Interface (V = +3.3V +25°C, unless otherwise noted TEMPERATURE ERROR vs. PC BOARD RESISTANCE PATH = DXP TO GND -10 PATH = DXP TO ...

Page 5

Remote-Junction Temperature-Controlled Fan-Speed Regulator with SMBus Interface PIN NAME 1 VFAN Fan Drive Power-Supply Input. 4.5V to 13.5V Supply Voltage Input. +3V to +5.5V. Bypass DXP Input: Remote-Junction Anode. Place a 2200pF capacitor between DXP ...

Page 6

Remote-Junction Temperature-Controlled Fan-Speed Regulator with SMBus Interface DXP MUX ADC DXN CENTRAL LOGIC SMBCLK SMBus INTERFACE SMBDATA ADD0 ADDRESS DECODER ADD1 Figure 1. MAX6660 Block Diagram 6 ________________________________________________________________________________________ FAN-SPEED REGULATOR REGISTERS T MAX T COMPARAT0R HYST REMOTE DATA TEMPERATURE T ...

Page 7

Remote-Junction Temperature-Controlled Fan-Speed Regulator with SMBus Interface ly measure the die temperature of CPUs and other ICs that have on-board temperature-sensing diodes. The transistor must be a small-signal type with a rela- tively high forward voltage. Otherwise, the A/D input ...

Page 8

Remote-Junction Temperature-Controlled Fan-Speed Regulator with SMBus Interface improvement in leakage and noise over narrow traces. Use wider traces when practical. 7) Add a 50Ω resistor in series with V noise filtering (see Typical Operating Circuit). PC Board Layout Checklist • ...

Page 9

Remote-Junction Temperature-Controlled Fan-Speed Regulator with SMBus Interface Write Byte Format S ADDRESS WR 7 bits Slave Address: equiva- lent to chip-select line of a 3-wire interface Read Byte Format S ADDRESS WR ACK 7 bits Slave Address: equiva- lent to ...

Page 10

Remote-Junction Temperature-Controlled Fan-Speed Regulator with SMBus Interface The SMBus interface includes a Timeout, which resets the interface any time the data or clock line is held low for more than 35ms, ensuring that the MAX6660 can never “lock” the bus. ...

Page 11

Remote-Junction Temperature-Controlled Fan-Speed Regulator with SMBus Interface master. Upon receiving an ALERT interrupt signal, the host master can broadcast a Receive Byte transmission to the Alert Response slave address (see Slave Addresses section). Then, any slave device that gener- ated ...

Page 12

Remote-Junction Temperature-Controlled Fan-Speed Regulator with SMBus Interface Table 4. Command-Byte Bit Assignments REGISTERS COMMAND RRL 00h RRH 01h RSL 02h RCL/WCL 03h/09h RFCR/WFCR 04h/0Ah RTMAX/WTMAX 10h/12h RTHYST/WTHYST 11h/13h RTHIGH/WTHIGH 07h/0Dh RTLOW/WTLOW 08h/0Eh SPOR FCh OSHT 0Fh RTFAN/WTFAN 14h/19h RFSC/WFSC 15h/1Ah ...

Page 13

Remote-Junction Temperature-Controlled Fan-Speed Regulator with SMBus Interface Table 5. Configuration-Byte Bit Assignments BIT NAME ALERT Mask 7(MSB) 6 Run/Stop OVERT Polarity 5 4 Write Protect Thermal Closed/ 3 Open Loop OVERT Input Inhibit 2 Mask OVERT 1 Output ALERT Clear ...

Page 14

Remote-Junction Temperature-Controlled Fan-Speed Regulator with SMBus Interface Table 7. POR Slave Address Decoding (ADD0 and ADD1) ADD0 ADD1 GND GND GND High-impedance GND V CC High-impedance GND High-impedance High-impedance High-impedance GND CC V High-impedance ...

Page 15

Remote-Junction Temperature-Controlled Fan-Speed Regulator with SMBus Interface to 16s and stores the data in an update register (UPDATE). This enables control over timing of the ther- mal feedback loop to optimize stability. The Fan Threshold (T ) register value is ...

Page 16

Remote-Junction Temperature-Controlled Fan-Speed Regulator with SMBus Interface range of reference clock full-scale frequencies from 33Hz to 66Hz. A further division is performed to set the actual desired fan speed. This value appears in the Fan- Speed Control register in thermal ...

Page 17

Remote-Junction Temperature-Controlled Fan-Speed Regulator with SMBus Interface Table 12. Fan Count Divisor Register (RFCD/WFCD) REGISTER/ ADDRESS COMMAND Bit 7 POR State 0 Notes: This byte sets the prescalar division ratio for tachometer or current-sense feedback. (This register does not apply ...

Page 18

Remote-Junction Temperature-Controlled Fan-Speed Regulator with SMBus Interface Fan Conversion Rate Byte The FCR register (Table 8) programs the fan’s update time interval in free-running autonomous mode (RUN/ STOP = 0). The conversion rate byte’s POR state is 02h (0.25Hz). The ...

Page 19

Remote-Junction Temperature-Controlled Fan-Speed Regulator with SMBus Interface speeds except at very low speeds where a fan failure is indicated by an overflow of the fan speed counter rather than f . The overflow flag cannot be viewed sep- L arately ...

Page 20

Remote-Junction Temperature-Controlled Fan-Speed Regulator with SMBus Interface Table 14. Fan Manufacturers MANUFACTURER FAN MODEL OPTION All DC brushless models can be Comair Roton ordered with optional tachometer output. Tachometer output optional on EBM-Papst some models. All DC brushless models can ...

Page 21

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 21 © 2006 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc ...

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