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PDF MAX6663AEE Data sheet ( Hoja de datos )
| Número de pieza | MAX6663AEE | |
| Descripción | Temperature Monitors and PWM Fan Controllers | |
| Fabricantes | Maxim Integrated | |
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19-2865; Rev 1; 12/03
Temperature Monitors and
PWM Fan Controllers
General Description
The MAX6653/MAX6663/MAX6664 are ACPI-compliant
local and remote-junction temperature sensors and fan
controllers. These devices measure their own die tem-
perature, as well as the temperature of a remote-PN
junction and control the speed of a DC cooling fan
based on the measured temperature. Remote tempera-
ture measurement accuracy is ±1°C from +60°C to
+100°C. Temperature measurement resolution is
0.125°C for both local and remote temperatures.
Internal watchdog set points are provided for both local
and remote temperatures. There are two comparison
set points for local temperatures and two for remote
temperatures. When a set point is crossed, the
MAX6653/MAX6663/MAX6664 assert either the INT or
THERM outputs. These outputs can be used as inter-
rupts, clock throttle signals, or overtemperature shut-
down signals. Two pins on the MAX6653 control the
power-up values of the comparison set points, provid-
ing fail-safe protection even when the system is unable
to program the trip temperatures. The MAX6653 has
two additional shutdown outputs, SDR and SDL, that
are triggered when the remote or local temperatures
exceed the programmed shutdown set points. The INT
output for the MAX6653/MAX6663 and THERM outputs
for the MAX6653/MAX6663/MAX6664 can also function
as inputs if either is pulled low to force the fan to full
speed, unless this function is masked by the user.
The MAX6653/MAX6663/MAX6664 are available in
16-pin QSOP packages and operate over the -40°C to
+125°C temperature range.
Features
o Remote-Junction Temperature Sensor Within
±1°C Accuracy (+60°C to +100°C)
o ACPI-Compatible Programmable Temperature
Alarms
o 0.125°C Resolution Local and Remote-Junction
Temperature Measurement
o Programmable Temperature Offset for System
Calibration
o SMBus 2-Wire Serial Interface with Timeout
o Automatic or Manual Fan-Speed Control
o PWM Fan Control Output
o Fan-Speed Monitoring and Watchdog
o Fan Fault and Failure Indicators
o Compatible with 2-Wire or 3-Wire Fans
(Tachometer Output)
o +3V to +5.5V Supply Range
o Additional Shutdown Set Point (MAX6653)
o Controlled PWM Rise/Fall Times
PART
MAX6653AEE
MAX6663AEE
MAX6664AEE
Ordering Information
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
16 QSOP
16 QSOP
16 QSOP
Personal Computers
Servers
Workstations
Telecom Equipment
Networking Equipment
Test Equipment
Industrial Controls
Applications
Typical Operating Circuits appear at end of data sheet.
Functional Diagram appears at end of data sheet.
Pin Configurations
TOP VIEW
PWM_OUT 1
TACH/AIN 2
CRT0 3
CRT1 4
GND 5
VCC 6
THERM 7
FAN_FAULT 8
MAX6653
16 SMBCLK
15 SMBDATA
14 INT
13 ADD
12 SDR
11 SDL
10 DXP
9 DXN
QSOP
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
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.
1 page  
Temperature Monitors and
PWM Fan Controllers
Pin Description
PIN
MAX6653
QSOP
MAX6663/
MAX6664
QSOP
11
22
3—
4—
— 3, 4
55
66
77
88
99
10 10
11 —
12 —
— 11, 12
13 13
14 14
15 15
16 16
— 12
NAME
PWM_OUT
TACH/AIN
CRIT0
CRIT1
N.C.
GND
VCC
THERM
FAN_FAULT
DXN
DXP
SDL
SDR
N.C.
ADD
INT
SMBDATA
SMBCLK
N.C.
FUNCTION
Digital Output (Open Drain). Pulse-width modulated output to external power transistor.
Requires a pullup resistor (10kΩ typ).
Digital/Analog Input. Fan tachometer input. May be reprogrammed as an analog input to
measure speed of a 2-wire fan. See Figure 5.
Input. Used in conjunction with CRIT1 to set THERM and SHUTDOWN default set points
(see Table 1).
Input. Used in conjunction with CRIT0 to set THERM and SHUTDOWN default set points
(see Table 1).
No Connection. Not internally connected.
Ground
Power Supply. Bypass with a 0.01µF capacitor to GND.
Digital I/O (Open Drain). An active-low thermal-overload output to indicate that the
overtemperature set point has been exceeded. Also acts as an input to provide external
fan control. When this pin is pulled low by an external signal, a status bit is set and the
fan speed is forced full-on. Requires a pullup resistor (10kΩ typ).
Digital Output (Active Low, Open Drain). Signals a fan fault. Requires a pullup resistor
(10kΩ typ).
Combined Current Sink and A/D Negative Input. DXN is internally biased to a diode
voltage above ground.
Combined Current Source and A/D Positive Input for the Remote-Diode Channel. Do not
leave DXP floating; connect DXP to DXN if no remote diode is used. Place a 2200pF
capacitor between DXP and DXN for noise filtering.
An Active-Low Open-Drain Output. It indicates that local temperature is above the
shutdown set point. Normally used to directly deactivate the CPU power supply.
An Active-Low Open-Drain Output. It indicates that remote temperature is above the
shutdown set point. Normally used to directly deactivate the CPU power supply.
Internal Connection. Leave floating or connect to GND.
Three-State Logic Input. Sets the 2 lower bits of the device SMBus address (Table 2).
ADD is not an ordinary logic input pin; ADD should be connected to VCC, GND, or float.
Digital Output (Open Drain). Can be programmed as an interrupt output for
temperature/fan speed interrupts. Requires a pullup resistor (10kΩ typ). For the
MAX6653/MAX6663, it can be used also as an input. If pulled low, fan speed is forced to
maximum unless masked.
SMBus Serial-Data Input/Output (Open Drain). Requires a pullup resistor (10kΩ typ).
SMBus Serial-Clock Input. Requires a pullup resistor (10kΩ typ).
Internal Connection. Leave floating or connect to GND.
_______________________________________________________________________________________ 5
5 Page 
Temperature Monitors and
PWM Fan Controllers
Table 9. Setting PWM Duty Cycle
BITS [3:0] OF FAN-SPEED
CONFIGURATION REGISTER (22h)
BIT 3 BIT 2
BIT 1
BIT 0
00
0
0
00
0
1
00
1
0
00
1
1
01
0
0
01
0
1
01
1
0
01
1
1
10
0
0
10
0
1
10
1
0
10
1
1
11
0
0
11
0
1
11
1
0
11
1
1
% DUTY
CYCLE (%)
0
7
14
20
27
33
40
47
53
60
67
73
80
87
93
100
Automatic Fan-Control Mode
Automatic fan-speed control is selected by setting bits
[7:5] of configuration register 1 (00h) to 100 (to control
speed based on the remote temperature) or 101 (to
control speed based on both remote and local temper-
ature). Program a threshold, or starting temperature
TMIN, and the desired temperature range, TRANGE, into
the local temp TMIN/TRANGE register (24h) for local
temperature and into the remote temp TMIN/TRANGE
register (25h) for remote temperature (Tables 10 and
11). If the fan control responds to both local and remote
temperatures, the higher PWM duty cycle has priority.
Table 10. TRANGE Fan-Control Temperature
Range Bits [2:0] TMIN/TRANGE Registers
(24h and 25h)—POR = 001
BIT 2
BIT 1
BIT 0
TEMPERATURE
RANGE (°C)
000
001
010
011
100
5
10
20
40
80
When the temperature exceeds TMIN, the fan is
enabled at a minimum duty cycle programmed in bits
[3:0] of the fan-speed configuration register (22h). The
duty cycle increases in proportion to the temperature
difference and reaches 100% at a temperature equal to
(TMIN + TRANGE). A hysteresis of 5°C is built into the
TMIN set point to prevent the fan from starting and stop-
ping when the temperature is at the set point.
Spin-Up
To ensure proper fan startup, the MAX6653/MAX6663/
MAX6664 can be set to drive the fan to 100% duty
cycle for a short period on startup, and then revert to
the correct duty cycle. The spin-up time is programmed
by bits [2:0] in the fan characteristics register (20h).
The spin-up feature can be disabled by setting bit 7 of
the fan-filter register (23h) to 1; POR value is zero.
Table 12 shows programming of the spin-up time.
Fan-Filter Mode
When the MAX6653/MAX6663/MAX6664 are used for
automatic fan-speed control, the fan-filter mode helps
minimize the audible effects of varying fan speeds. The
fan-filter mode limits the rate at which fan speed can
change. Each time a new temperature measurement is
made, the fan-filter mode allows the PWM duty cycle to
increment by a selectable amount. The duty cycle can
change by 1/240, 2/240, 4/240, or 8/240 (0.416%,
0.833%, 1.667%, or 3.333%) of the PWM period after
each temperature-monitoring cycle. This prevents sud-
den changes in fan speed, even when temperature
changes suddenly.
The filter mode is set by bit 0 of the fan-filter register
(23h). To enable the fan-filter mode, write a 1 to this bit.
Bits [6:5] of the same register control the size of the
PWM steps.
Note that the rate of change depends on both the value
selected by the fan-filter bits and on the temperature
Table 11.TMIN Fan-Control Start
Temperature; Bits [7:3] TMIN/TRANGE
Registers (24h—POR = 01000 and
25h—POR = 01100
BIT 7
MSB = +64°C
BIT 6
BIT5
BIT 4
BIT3
LSB = +4°C
Min threshold = 0°C
Max threshold = +127°C
LSB/step size = +4°C
POR = +48°C or 01100b
______________________________________________________________________________________ 11
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