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MAX6616AEG+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
General Description
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
TM
) write byte, read byte,
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
CC
.
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.
Applications
Desktop Computers
Servers
Power Supplies
Networking Equipment
Workstations
Features
o Two Thermistor Inputs
o Two Open-Drain PWM Outputs for Fan-Speed
Control
o Local Temperature Sensor
o Six GPIOs (MAX6616)
o Programmable Fan-Control Characteristics
o Controlled PWM Rate-of-Change Ensures
Unobtrusive Fan-Speed Adjustments
o Fail-Safe System Protection
o OT Output for Throttling or Shutdown
o Nine Different Pin-Programmable SMBus
Addresses
o 16-Pin and 24-Pin QSOP Packages
MAX6615/MAX6616
Dual-Channel Temperature Monitors and
Fan-Speed Controllers with Thermistor Inputs
________________________________________________________________
Maxim Integrated Products
1
19-3713; Rev 2; 10/08
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.
Ordering Information
PART TEMP RANGE PIN-PACKAGE
MAX6615AEE -40°C to +125°C 16 QSOP
MAX6616AEG -40°C to +125°C 24 QSOP
SMBus is a trademark of Intel Corp.
Typical Application Circuits and Pin Configurations appear at
end of data sheet.
THERMISTORS
AND LOCAL
TEMP SENSOR
PWM
GENERATOR
AND TACH
COUNTER
SMBus
INTERFACE
AND
REGISTERS
LOGIC
ADD0 ADD1
*MAX6616 ONLY
FAN_FAIL
MAX6615
MAX6616
GND
V
CC
SDA
SCL
REF
TH1
TH2
PWM1
PWM2
TACH1
TACH2
OT
GPIO0*
GPIO5*
PRESET*
Functional Diagram
MAX6615/MAX6616
Dual-Channel Temperature Monitors and
Fan-Speed Controllers with Thermistor Inputs
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
All Voltages Are Referenced to GND
Supply Voltage (V
CC
) ...............................................-0.3V to +6V
PWM_, TACH_, OT, FAN_FAIL ............................-0.3V to +13.5V
ADD0, ADD1, SDA, SCL ..........................................-0.3V to +6V
All Other Pins..............................................-0.3V to (V
CC
+ 0.3V)
SDA, OT, FAN_FAIL, PWM_, GPIO_ Current....................±50mA
TH_ Current ........................................................................±1mA
REF Current ......................................................................±20mA
Continuous Power Dissipation (T
A
= +70°C)
16-Pin QSOP (derated at 8.3mW/°C
above +70°C)............................................................666.7mW
24-Pin QSOP (derated at 9.5mW/°C
above +70°C)...........................................................761.9 mW
ESD Protection (all pins, Human Body Model) ....................±2kV
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
ELECTRICAL CHARACTERISTICS
(V
CC
= +3.0V to +5.5V, T
A
= 0°C to +125°C, unless otherwise noted. Typical values are at V
CC
= +3.3V, T
A
= +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Operating Supply Voltage
V
CC
3.0 5.5 V
Standby Current Interface inactive, ADC in idle state 10 µA
Operating Current I
S
Interface inactive, ADC active 0.5 1 mA
External Temperature Error
V
CC
= +3.3V, 0.15V ≤ V
TH_
≤ +0.71V (excludes
thermistor errors, thermistor nonlinearity) (Note1)
±1 °C
V
CC
= +3.3V, 0°C ≤ T
A
≤ +85°C, ±2.5
Internal Temperature Error
V
CC
= +3.3V, 0°C ≤ T
A
≤ +125°C ±4
°C
Temperature Resolution 0.125 °C
Conversion Time 250 ms
Conversion Rate Timing Error -20 +20 %
PWM Frequency Error -20 +20 %
INPUT/OUTPUT
Output Low Voltage V
OL
V
CC
= +3V, I
OUT
= 6mA 0.4 V
Output High Leakage Current I
OH
1µA
Logic Low Input Voltage V
IL
0.8 V
Logic High Input Voltage V
IH
2.1 V
Input Leakage Current 1µA
Input Capacitance C
IN
5pF
SMBus TIMING (Figures 2, 3) (Note 2)
Serial Clock Frequency f
SCLK
10 400 kHz
Clock Low Period t
LOW
10% to 10% 4 µs
Clock High Period t
HIGH
90% to 90% 4.7 µs
Bus Free Time Between STOP
and START Conditions
t
BUF
4.7 µs
SMBus START Condition
Setup Time
t
SU:STA
90% of SCL to 90% of SDA 4.7 µs
MAX6615/MAX6616
Dual-Channel Temperature Monitors and
Fan-Speed Controllers with Thermistor Inputs
_______________________________________________________________________________________ 3
Note 1: 1°C of error corresponds to an ADC error of 7.76mV when V
REF
= 1V.
Note 2: Guaranteed by design and characterization.
Note 3: Production tested.
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3.0V to +5.5V, T
A
= 0°C to +125°C, unless otherwise noted. Typical values are at V
CC
= +3.3V, T
A
= +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
START Condition Hold Time t
HD:STO
10% of SDA to 10% of SCL 4 µs
STOP Condition Setup Time t
SU:STO
90% of SCL to 10% of SDA 4 µs
Data Setup Time t
SU:DAT
10% of SDA to 10% of SCL 250 ns
Data Hold Time t
HD:DAT
10% of SCL to 10% of SDA 300 ns
SMBus Fall Time t
F
300 ns
SMBus Rise Time t
R
1000 ns
SMBus Timeout (Note 3) 29 37 55 ms
Typical Operating Characteristics
(V
CC
= +3.3V, T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX6615/6 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (µA)
5.04.54.03.5
10
100
1000
1
3.0 5.5
LOCAL
REMOTE
SHUTDOWN
0
40
20
80
60
100
120
THERMISTOR TEMPERATURE DATA
vs. THERMISTOR TEMPERATURE
MAX6615/6 toc02
THERMISTOR TEMPERATURE (°C)
THERMISTOR TEMPERATURE DATA (°C)
0406020 80 100 120
LOCAL TEMPERATURE ERROR
vs. DIE TEMPERATURE
MAX6615/6 toc03
DIE TEMPERATURE (°C)
TEMPERATURE ERROR (°C)
755025
-1
0
1
2
-2
0100
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

MAX6616AEG+T

Mfr. #:
Buy MAX6616AEG+T
Manufacturer:
Maxim Integrated
Description:
Board Mount Temperature Sensors Dual Ch Temperature Monitor
Lifecycle:
New from this manufacturer.
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