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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1669 Datasheet

Fan Controller and Remote Temperature Sensor with SMBus Serial Interface

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MAX1669 pdf
19-1574; Rev 0; 1/00
Fan Controller and Remote Temperature Sensor
with SMBus Serial Interface
General Description
The MAX1669 fan controller includes a precise digital
thermometer that reports the temperature of a remote
sensor. The remote sensor is a diode-connected transis-
tor—typically a low-cost, easily mounted 2N3906 PNP
type—replacing conventional thermistors or thermocou-
ples. Remote accuracy is ±3°C for transistors from multi-
ple manufacturers, with no calibration needed. The
MAX1669 has an independent fan controller with a low-
current logic output requiring external power compo-
nents to interface to a DC brushless fan. The fan
controller has two modes of operation: a low-frequency
(20Hz to 160Hz) PWM mode intended for driving the fan
motor, or a high-impedance DAC output that generates
a variable DC control voltage. In PWM mode, the FAN
frequency can be synchronized to an external clock.
Other key features include general-purpose inputs/out-
puts (GPIOs) for fan presence detection and a thermo-
stat output intended as a fan override signal in case the
host system loses the ability to communicate. The inter-
nal ADC has a wide input voltage range and gives
overrange readings when too large an input voltage is
applied. Other error-checking includes temperature
out-of-range indication and diode open/short faults.
The MAX1669 is available in a space-saving 16-pin
QSOP package that allows it to fit adjacent to the
SLOT1 connector.
Pentium® CPU Cooling
Desktop Computers
Notebook Computers
Servers
Workstations
Applications
Typical Operating Circuit appears at end of data sheet.
Features
o Measures Remote CPU Temperature
o No Calibration Required
o 20Hz to 160Hz PWM Output for Fan
o PWM Frequency Sync Input (260kHz)
o Flexible Fan Interface: Linear or PWM
o SMBus 2-Wire Serial Interface
o Programmable Under/Overtemperature Alarms
o ALERT Latched Interrupt Output
o OVERT Thermostat Output
o Two GPIO Pins
o Write-Once Configuration Protection
o Supports SMBus Alert Response
o ±3°C Temperature Accuracy (-40°C to +125°C,
remote)
o 3µA Standby Supply Current
o +3V to +5.5V Supply Range
o Small 16-Pin QSOP Package
PART
MAX1669EEE
Ordering Information
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
16 QSOP
Pin Configuration
TOP VIEW
I/O1 1
I/O2 2
ADD0 3
ADD1 4
ADD2 5
AGND 6
DXN 7
DXP 8
MAX1669
16 OVERT
15 ALERT
14 SMBDATA
13 SMBCLK
12 PGND
11 FAN
10 SYNC
9 VCC
Pentium is a registered trademark of Intel Corp.
QSOP
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1669 Datasheet

Fan Controller and Remote Temperature Sensor with SMBus Serial Interface

No Preview Available !

MAX1669 pdf
Fan Controller and Remote Temperature Sensor
with SMBus Serial Interface
ABSOLUTE MAXIMUM RATINGS
VCC to AGND...........................................................-0.3V to +6V
DXP, ADD_ to AGND.................................-0.3V to (VCC + 0.3V)
DXN to AGND.......................................................-0.3V to +0.8V
SMBCLK, SMBDATA, ALERT, SYNC,
I/O1, I/O2, OVERT, FAN to AGND ......................-0.3V to +6V
FAN to PGND ............................................-0.3V to (VCC + 0.3V)
PGND to AGND ....................................................-0.3V to +0.3V
PWM Current....................................................-50mA to +50mA
SMBDATA Current .............................................-1mA to +50mA
I/O1, I/O2 Current...............................................-1mA to +25mA
DXN Current ......................................................................±1mA
ESD Protection (all pins, Human Body Model) .................2000V
Continuous Power Dissipation (TA = +70°C)
16-Pin QSOP (derate 8.30mW/°C above +70°C).......667mW
Operating Temperature Range (extended) ......-55°C to +125°C
Junction Temperature .....................................................+150°C
Storage Temperature Range ............................-65°C to +150°C
Lead Temperature (soldering, 10s) ................................+300°C
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.
ELECTRICAL CHARACTERISTICS
(VCC = +3.3V, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
ADC AND POWER SUPPLY
Resolution (Note 1)
CONDITIONS
Monotonicity guaranteed
MIN TYP MAX UNITS
8 Bits
Temperature Error, Remote Diode (Note 2) TR = 0°C to +100°C, diode ideality factor = 1.013
Supply Voltage Range
-3
3
3 °C
5.5 V
Undervoltage Lockout Threshold
VCC input, disables A/D conversion,
rising edge
2.6 2.8 2.95
V
Undervoltage Lockout Hysteresis
Power-On Reset Threshold
POR Threshold Hysteresis
Standby Supply Current
VCC, falling edge
SMBus static
SMBCLK at 10kHz
50 mV
1 1.9 2.5 V
50 mV
3 10
µA
3
Average Operating Supply Current
Autoconvert mode,
average measured over 1s
FAN output set to
150Hz mode
FAN output set to
DAC mode
75 150 µA
360 µA
Conversion Time
From stop bit to conversion complete
47 62 78 ms
Conversion Rate
Remote-Diode Source Current
DXN Source Voltage
FAN OUTPUT
FAN Output Source Current
FAN Output Sink Current
Autoconvert mode
VDXP forced to VDXN
+ 0.65V
High level
Low level
PWM mode, VFAN forced to 2.9V
PWM mode, VFAN forced to 0.4V
1.6 2 2.4 Hz
80 100 120
µA
8 10 12
0.7 V
10 mA
-10 mA
2 _______________________________________________________________________________________


Part Number MAX1669
Description Fan Controller and Remote Temperature Sensor with SMBus Serial Interface
Maker Maxim
Total Page 20 Pages
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