MAX6650EUB+T Maxim Integrated Products, MAX6650EUB+T Datasheet

IC REG FAN SPEED 10-MSOP

MAX6650EUB+T

Manufacturer Part Number
MAX6650EUB+T
Description
IC REG FAN SPEED 10-MSOP
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX6650EUBT.pdf (25 pages)

Specifications of MAX6650EUB+T

Applications
Fan Controller, Brushless (BLDC)
Number Of Outputs
1
Voltage - Load
0.3 V ~ 5.2 V
Voltage - Supply
3 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
10-MSOP, Micro10™, 10-uMAX, 10-uSOP
Operating Supply Voltage
3 V to 5.5 V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Output
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
MAX6650EUB+T
MAX6650EUB+TTR
The MAX6650/MAX6651 fan controllers use an
SMBus™/I
the speed of 5VDC/12VDC brushless fans with built-in
tachometers. They automatically force the fan’s tachome-
ter frequency (fan speed) to match a preprogrammed
value in the Fan-Speed Register by using an external
MOSFET or bipolar transistor to linearly regulate the volt-
age across the fan. The MAX6650 regulates the speed of
a single fan by monitoring its tachometer output. The
MAX6651 also regulates the speed of a single fan, but it
contains additional tachometer inputs to monitor up to four
fans and control them as a single unit when they are used
in parallel.
The MAX6650/MAX6651 provide general-purpose
input/output (GPIO) pins that serve as digital inputs,
digital outputs, or various hardware interfaces. Capable
of sinking 10mA, these open-drain inputs/outputs can
drive an LED. To add additional hardware control, con-
figure GPIO1 to fully turn on the fan in case of software
failure. To generate an interrupt when a fault condition
is detected, configure GPIO0 to behave as an active-
low alert output. Synchronize multiple devices by set-
ting GPIO2 (MAX6651 only) as an internal clock output
or an external clock input.
The MAX6650 is available in a space-saving 10-pin
µMAX
small 16-pin QSOP package.
19-1784; Rev 4; 7/10
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
________________________Applications
®
RAID
Servers
Workstations
package, and the MAX6651 is available in a
2
C-compatible interface to regulate and monitor
________________________________________________________________ Maxim Integrated Products
General Description
INTERFACE
3V TO 5.5V
SMBus/I
Desktop Computers
Networking
Telecommunications
with SMBus/I
V
CC
2
C
Fan-Speed Regulators and Monitors
LED
FULL ON
ALERT
V
SCL
SDA
GPIO0
GPIO1
CC
MAX6650
2
C-Compatible Interface
♦ Closed/Open-Loop Fan-Speed Control for
♦ 2-Wire SMBus/I
♦ Monitors Tachometer Output
♦ Programmable Alert Output
♦ GPIOs
♦ Hardware Full-On Override
♦ Synchronize Multiple Fans
♦ Four Selectable Slave Addresses
♦ 3V to 5.5V Supply Voltage
♦ Small Packages
____________________________Features
+ Denotes a lead(Pb)-free/RoHS-compliant package.
SMBus is a trademark of Intel Corp.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Pin Configurations appear at end of data sheet.
MAX6650EUB
MAX6650EUB+
MAX6651EEE
MAX6651EEE+
TACH0
5V/12V Fans
GND
ADD
OUT
FB
10-Pin µMAX (MAX6650)
16-Pin QSOP (MAX6651)
Single Tachometer (MAX6650)
Up to Four Tachometers (MAX6651)
PART
10kΩ
5V OR 12V
Typical Operating Circuit
V
2
FAN
C-Compatible Interface
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
FAN
TEMP RANGE
C
10μF
Ordering Information
COMP
PIN-PACKAGE
10 µMAX
10 µMAX
16 QSOP
16 QSOP
1

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MAX6650EUB+T Summary of contents

Page 1

... Small Packages 10-Pin µMAX (MAX6650) 16-Pin QSOP (MAX6651) PART MAX6650EUB MAX6650EUB+ MAX6651EEE MAX6651EEE+ + Denotes a lead(Pb)-free/RoHS-compliant package. SMBus is a trademark of Intel Corp. µMAX is a registered trademark of Maxim Integrated Products, Inc. Pin Configurations appear at end of data sheet 10kΩ MAX6650 TACH0 SCL SDA FB ...

Page 2

Fan-Speed Regulators and Monitors 2 with SMBus/I C-Compatible Interface ABSOLUTE MAXIMUM RATINGS V to GND ..............................................................-0.3V to +6V CC FB, TACH_ ..........................................................-0.3V to +13.2V All Other Pins..............................................-0. Output Voltages..........................................-0. Maximum Current Into V , GND, V ...

Page 3

Fan-Speed Regulators and Monitors with SMBus/I ELECTRICAL CHARACTERISTICS (continued 3.0V to 5.5V -40°C to +85°C, unless otherwise noted. Typical values are PARAMETER SYMBOL ADDRESS SELECT (ADD) ADD Input Low Voltage V IL(ADD) ...

Page 4

Fan-Speed Regulators and Monitors 2 with SMBus/I C-Compatible Interface TIMING CHARACTERISTICS (continued 3.0V to 5.5V -40°C to +85°C, unless otherwise noted. Typical values are PARAMETER SYMBOL Setup Time for Stop Condition t ...

Page 5

Fan-Speed Regulators and Monitors with SMBus/I PIN PIN NAME MAX6650 MAX6651 1 1 TACH0 TACH2, TACH3, — TACH1 2 4 GND 3 5 SDA 4 6 SCL 5 8 ADD — GPIO4, GPIO3 6 9 ...

Page 6

Fan-Speed Regulators and Monitors 2 with SMBus/I C-Compatible Interface SMBus 5.5V INTERFACE FAN SPEED SCL CONFIGURE SMBus SDA INTERFACE ALARM ENABLE ALARM STATUS TACH COUNT COUNT TIME GPIO DEF GPIO ...

Page 7

Fan-Speed Regulators and Monitors with SMBus ADDRESS 7 bits 0 Slave Address Figure 2a. SMBus Protocol: Write Byte Format WR S ADDRESS 7 bits 0 Slave Address S ADDRESS RD 7 bits 1 Slave Address. Repeated due to ...

Page 8

Fan-Speed Regulators and Monitors 2 with SMBus/I C-Compatible Interface LOW HIGH SMBCLK SMBDATA t t HD:STA SU:STA A = START CONDITION B = MSB OF ADDRESS CLOCKED INTO SLAVE C = LSB OF ADDRESS CLOCKED INTO ...

Page 9

Fan-Speed Regulators and Monitors with SMBus/I Table 2. Command-Byte Assignments REGISTER COMMAND SPEED 0000 0000 CONFIG 0000 0010 GPIO DEF 0000 0100 DAC 0000 0110 ALARM ENABLE 0000 1000 ALARM 0000 1010 TACH0 0000 1100 TACH1 0000 1110 TACH2 0001 ...

Page 10

Fan-Speed Regulators and Monitors 2 with SMBus/I C-Compatible Interface Table 4. Configuration Byte Register BIT NAME 7 (MSB — MODE 5/12V (LSB) SCALE V CC MAX6650 MAX6651 100kΩ GPIO GPIO_ STATUS ...

Page 11

Fan-Speed Regulators and Monitors with SMBus/I Table 5. GPIO Definition Register POR MAX6650 BIT (DEFAULT) PIN STATE N (must (must be 1) N/A 5:4 11 (must be 11) 3:2 11 GPIO1 1:0 11 ...

Page 12

Fan-Speed Regulators and Monitors 2 with SMBus/I C-Compatible Interface Table 7. Alarm-Enable Register Bit Masks BIT NAME 7 (MSB — 4 GPIO2 (MAX6651 only) 3 GPIO1 2 TACH 1 MIN 0 (LSB) MAX 1 = Enabled Table 8. ...

Page 13

Fan-Speed Regulators and Monitors with SMBus 5.5V 2 SMBus/I C INTERFACE Figure 6. Fan Control with a Bipolar Transistor tion, use DAC values between 08h and B0h (see Typical Operating Characteristics ). When using the closed-loop ...

Page 14

Fan-Speed Regulators and Monitors 2 with SMBus/I C-Compatible Interface impedance of the tachometer input (150kΩ max) or the feedback input (150kΩ max). Compensation Capacitor A compensation capacitor is needed from the fan’s low side to ground to stabilize the analog ...

Page 15

Fan-Speed Regulators and Monitors with SMBus 5.5V MAX6651 Figure 8. Monitoring Multiple Fans very rough rule of thumb, 12V fans can be expected to experience problems somewhere around 1/4 to 1/2 their rated speed. Predicting Future ...

Page 16

Fan-Speed Regulators and Monitors 2 with SMBus/I C-Compatible Interface TO INT PIN ON NC Figure Application downtime. The system should be designed so that the number of fans used is one more than are actually needed. ...

Page 17

Fan-Speed Regulators and Monitors with SMBus μC SCL SDA GND Figure 10. Temperature Monitoring and Fan Control ______________________________________________________________________________________ 2 C-Compatible Interface GND ADD1 MAX1617A ADD0 DXP STBY V DXN CC SCL SDA ALERT ALERT GPIO0 FULL ...

Page 18

Fan-Speed Regulators and Monitors 2 with SMBus/I C-Compatible Interface 5.5V 2 SMBus/I C INTERFACE MAX6501 TOVER Figure 11. MAX6501 Hardware Fail-Safe MAX6501 TOVER MAX6501 TOVER MAX6501 TOVER Figure 12. MAX6501 Hardware Fail-Safe independently control each fan. ...

Page 19

Fan-Speed Regulators and Monitors with SMBus 5.5V 2 SMBus/I C INTERFACE Figure 13. Hot-Swap Application For parallel fan control while monitoring only a single fan, select the MAX6650. Synchronized Fan Control (MAX6651 Only) In systems with ...

Page 20

Fan-Speed Regulators and Monitors 2 with SMBus/I C-Compatible Interface ware control. To enter full-on mode through hardware, see the Setting Up the GPIOs section. Note that a hard- ware full-on overrides all other modes. Configure the MAX6650/MAX6651 to run in ...

Page 21

Fan-Speed Regulators and Monitors with SMBus/I The MAX6650 regulates fan speed in the following manner. The output of an internal 254kHz oscillator is divided by 128, generating a roughly 2kHz signal. This signal is divided by 1 plus the value ...

Page 22

Fan-Speed Regulators and Monitors 2 with SMBus/I C-Compatible Interface We will start with (to increase stability SCALE could be tried improve response time could be tried). Second, calculate the appropriate value ...

Page 23

Fan-Speed Regulators and Monitors with SMBus/I Synchronizing Fans GPIO2 can be configured to allow multiple MAX6651s to synchronize the speeds of the fans they are driving (Figure 14). Synchronization is accomplished by having one of the MAX6651s (or an external ...

Page 24

Fan-Speed Regulators and Monitors 2 with SMBus/I C-Compatible Interface TOP VIEW TACH0 1 GND 2 SDA 3 SCL 4 ADD 5 For the latest package outline information and land patterns www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” ...

Page 25

... 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 ____________________ 25 © 2010 Maxim Integrated Products ...

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