MAX6615AEE+ Maxim Integrated Products, MAX6615AEE+ Datasheet

IC TEMP MONITOR DL-CH 16-QSOP

MAX6615AEE+

Manufacturer Part Number
MAX6615AEE+
Description
IC TEMP MONITOR DL-CH 16-QSOP
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX6615AEE.pdf (20 pages)

Specifications of MAX6615AEE+

Function
Fan Control, Temp Monitor
Topology
ADC, PWM Generator, Tach Counter
Sensor Type
External & Internal
Sensing Temperature
-40°C ~ 125°C, External Sensor
Output Type
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
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX6615/MAX6616 monitor two temperature chan-
nels, either the internal die temperature and the temper-
ature of an external thermistor, or the temperatures of
two external thermistors. The temperature data controls
a PWM output signal to adjust the speed of a cooling
fan, thereby minimizing noise when the system is run-
ning cool, but providing maximum cooling when power
dissipation increases. The fans’ tachometer output sig-
nals are monitored by the MAX6615/MAX6616 to detect
fan failure. If a fan failure is detected, the FAN_FAIL
output is asserted.
The 2-wire serial interface accepts standard system
management bus (SMBus
send byte, and receive byte commands to read the
temperature data and program the alarm thresholds.
The programmable alarm output can be used to gener-
ate interrupts, throttle signals, or overtemperature shut-
down signals.
The MAX6616 features six GPIOs to provide additional
flexibility. All of the GPIOs power-up as inputs, with the
exception of GPIO0, which powers up as either an input
or an output as determined by connecting the PRESET
pin to ground or V
The MAX6616 is available in a 24-pin QSOP package,
while the MAX6615 is available in a 16-pin QSOP pack-
age. Both devices operate from a single-supply voltage
range of 3.0V to 5.5V, have operating temperature
ranges of -40°C to +125°C, and consume just 500µA of
supply current.
19-3713; Rev 2; 10/08
Typical Application Circuits and Pin Configurations appear at
end of data sheet.
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.
SMBus is a trademark of Intel Corp.
Desktop Computers
Servers
Power Supplies
Networking Equipment
Workstations
Fan-Speed Controllers with Thermistor Inputs
________________________________________________________________ Maxim Integrated Products
CC
.
Dual-Channel Temperature Monitors and
General Description
TM
) write byte, read byte,
Applications
o Two Thermistor Inputs
o Two Open-Drain PWM Outputs for Fan-Speed
o Local Temperature Sensor
o Six GPIOs (MAX6616)
o Programmable Fan-Control Characteristics
o Controlled PWM Rate-of-Change Ensures
o Fail-Safe System Protection
o OT Output for Throttling or Shutdown
o Nine Different Pin-Programmable SMBus
o 16-Pin and 24-Pin QSOP Packages
MAX6615AEE
MAX6616AEG
Control
Unobtrusive Fan-Speed Adjustments
Addresses
SCL
SDA
TH1
TH2
REF
PART
THERMISTORS
TEMP SENSOR
MAX6615
MAX6616
AND LOCAL
INTERFACE
REGISTERS
SMBus
GND
AND
-40°C to +125°C
-40°C to +125°C
V
TEMP RANGE
CC
Ordering Information
*MAX6616 ONLY
Functional Diagram
ADD0
GENERATOR
AND TACH
COUNTER
FAN_FAIL
LOGIC
PWM
ADD1
PIN-PACKAGE
16 QSOP
24 QSOP
Features
TACH1
PWM1
TACH2
PWM2
OT
GPIO0*
GPIO5*
PRESET*
1

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MAX6615AEE+ Summary of contents

Page 1

... Workstations SMBus is a trademark of Intel Corp. Typical Application Circuits and Pin Configurations appear at end of data sheet. ________________________________________________________________ Maxim Integrated Products 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. o Two Thermistor Inputs o Two Open-Drain PWM Outputs for Fan-Speed ...

Page 2

Dual-Channel Temperature Monitors and Fan-Speed Controllers with Thermistor Inputs ABSOLUTE MAXIMUM RATINGS All Voltages Are Referenced to GND Supply Voltage (V ) ...............................................-0.3V to +6V CC PWM_, TACH_, OT, FAN_FAIL ............................-0.3V to +13.5V ADD0, ADD1, SDA, SCL ..........................................-0.3V to +6V ...

Page 3

Dual-Channel Temperature Monitors and Fan-Speed Controllers with Thermistor Inputs ELECTRICAL CHARACTERISTICS (continued +3.0V to +5.5V 0°C to +125°C, unless otherwise noted. Typical values are PARAMETER SYMBOL START Condition Hold Time t HD:STO ...

Page 4

Dual-Channel Temperature Monitors and Fan-Speed Controllers with Thermistor Inputs (V = +3.3V +25°C, unless otherwise noted GPIO SINK CURRENT vs. SUPPLY VOLTAGE 0.4V GPIO_ 3.0 3.5 ...

Page 5

Dual-Channel Temperature Monitors and Fan-Speed Controllers with Thermistor Inputs PIN NAME MAX6616 MAX6615 20, GPIO0– — 23, 24 GPIO5 3 1 PWM1 4 2 TACH1 6 3 ADD0 7 4 ADD1 GND 9 6 ...

Page 6

Dual-Channel Temperature Monitors and Fan-Speed Controllers with Thermistor Inputs 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 ...

Page 7

Dual-Channel Temperature Monitors and Fan-Speed Controllers with Thermistor Inputs HIGH LOW SMBCLK SMBDATA t t SU:STA HD:STA A = START CONDITION B = MSB OF ADDRESS CLOCKED INTO SLAVE C = LSB OF ADDRESS CLOCKED INTO ...

Page 8

Dual-Channel Temperature Monitors and Fan-Speed Controllers with Thermistor Inputs Table 1. Temperature Data Format (High Byte and Low Byte) TEMPERATURE (°C) BINARY VALUE 140.0 127.0 25.375 25.0 0.5 0.0 <0 ture. The thermistor data in the temperature register(s) gives the ...

Page 9

Dual-Channel Temperature Monitors and Fan-Speed Controllers with Thermistor Inputs 500kΩ +3.3V 18kΩ 10kΩ PWM 1µF 27kΩ +3.3V Figure 5. Driving a Fan with a PWM-to-DC Circuit V CC 4.7kΩ PWM Figure 6. Controlling a PWM Input Fan with the MAX6615/ ...

Page 10

Dual-Channel Temperature Monitors and Fan-Speed Controllers with Thermistor Inputs DUTY CYCLE REGISTER 02h, BIT FAN-START DUTY CYCLE REGISTER 02h, BIT FAN-START TEMPERATURE Figure 7. Automatic PWM Duty Control the duty cycle returns to either ...

Page 11

Dual-Channel Temperature Monitors and Fan-Speed Controllers with Thermistor Inputs Table 2. Slave Address Decoding (ADD0 and ADD1) ADDO ADD1 GND GND GND High-Impedance GND V CC High-Impedance GND High-Impedance High-Impedance High-Impedance GND CC V High-Impedance CC V ...

Page 12

Dual-Channel Temperature Monitors and Fan-Speed Controllers with Thermistor Inputs Table 3. Register Map POR R/W ADD FUNCTION STATE 0000 Temperature R 00h 0000 channel 1 0000 Temperature R 01h 0000 channel 2 0001 C onfi g ur ati on R/W ...

Page 13

Dual-Channel Temperature Monitors and Fan-Speed Controllers with Thermistor Inputs Table 3. Register Map (continued) POR R/W ADD FUNCTION STATE PWM1 instantan- 0000 R 0Dh 000x eous duty cycle PWM2 0000 instantan- R 0Eh 000x eous duty cycle Channel 1 0000 ...

Page 14

Dual-Channel Temperature Monitors and Fan-Speed Controllers with Thermistor Inputs Table 3. Register Map (continued) POR R/W ADD FUNCTION STATE 0000 Fan status R/W 1Ch 0000 byte 0000 Channel 1 R 1Eh 0000 temp LSBs 0000 Channel 2 R 1Fh 0000 ...

Page 15

Dual-Channel Temperature Monitors and Fan-Speed Controllers with Thermistor Inputs zero, the duty cycle is zero below the fan-start tempera- ture and has this value when the fan-start temperature is reached. A value of 240 represents 100% duty cycle. Writing any ...

Page 16

Dual-Channel Temperature Monitors and Fan-Speed Controllers with Thermistor Inputs Table 7. PWM Frequency Select PWM SELECT A SELECT B FREQUENCY (Hz 100 1 35k X Note: At 35kHz, duty-cycle resolution is decreased from a ...

Page 17

Dual-Channel Temperature Monitors and Fan-Speed Controllers with Thermistor Inputs MAX6615/MAX6616 ERROR 4 OPTIMIZED FOR +30°C TO +100° -10 - TEMPERATURE (°C) Figure 9. Data Error vs. Temperature Using a ...

Page 18

Dual-Channel Temperature Monitors and Fan-Speed Controllers with Thermistor Inputs TOP VIEW PWM1 1 TACH1 2 3 ADD0 4 ADD1 MAX6615 5 GND TH1 6 7 REF 8 TH2 QSOP BETATHERM 10K3A1 THERMISTOR 1.6kΩ 1.6kΩ BETATHERM 10K3A1 THERMISTOR TO SMBus 18 ...

Page 19

Dual-Channel Temperature Monitors and Fan-Speed Controllers with Thermistor Inputs BETATHERM 10K3A1 THERMISTOR 1.6kΩ 1.6kΩ BETATHERM 10K3A1 THERMISTOR TO SMBus For the latest package outline information and land patterns www.maxim-ic.com/packages. PACKAGE TYPE 16 QSOP 24 QSOP ______________________________________________________________________________________ Typical Application ...

Page 20

... 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. 20 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2008 Maxim Integrated Products DESCRIPTION is a registered trademark of Maxim Integrated Products, Inc ...

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