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PDF MAX6615 Data sheet ( Hoja de datos )
| Número de pieza | MAX6615 | |
| Descripción | Dual-Channel Temperature Monitors and Fan-Speed Controllers | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-3713; Rev 2; 10/08
www.DataSheet4U.com
Dual-Channel Temperature Monitors and
Fan-Speed Controllers with Thermistor Inputs
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 (SMBusTM) 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 VCC.
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.
Desktop Computers
Servers
Power Supplies
Networking Equipment
Workstations
Applications
SMBus is a trademark of Intel Corp.
Typical Application Circuits and Pin Configurations appear at
end of data sheet.
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
PART
MAX6615AEE
MAX6616AEG
Ordering Information
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
16 QSOP
24 QSOP
Functional Diagram
FAN_FAIL
VCC
TH1
REF
TH2
THERMISTORS
AND LOCAL
TEMP SENSOR
PWM
GENERATOR
AND TACH
COUNTER
TACH1
PWM1
TACH2
PWM2
SCL SMBus
INTERFACE
AND
SDA
REGISTERS
LOGIC
MAX6615
MAX6616
GND
OT
GPIO0*
GPIO5*
PRESET*
ADD0 ADD1
*MAX6616 ONLY
________________________________________________________________ Maxim Integrated Products 1
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.
1 page  
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Dual-Channel Temperature Monitors and
Fan-Speed Controllers with Thermistor Inputs
Pin Description
PIN
MAX6616 MAX6615
1, 2, 5, 20,
23, 24
—
31
4
6
7
8
9
10, 15
11
2
3
4
5, 10
6
—
7
12 8
13 9
14 —
16 11
17 12
18 13
19 14
21 15
22 16
NAME
FUNCTION
GPIO0–
GPIO5
PWM1
TACH1
ADD0
ADD1
GND
TH1
N.C.
REF
TH2
FAN_FAIL
PRESET
OT
VCC
SDA
SCL
TACH2
PWM2
Active-Low, Open-Drain GPIOs. Can be pulled up to 5.5V regardless of VCC.
Fan Driver Output 1. The pullup resistor can be connected to a supply voltage as high as
12V, regardless of the supply voltage. See the PWM Output section for configuration.
Fan Tachometer Input. Accepts logic-level signal from fan’s tachometer output. Can be
connected to a supply voltage as high as 12V, regardless of the supply voltage.
SMBus Slave Address Selection
SMBus Slave Address Selection
Ground. Must be connected together for MAX6615.
External Thermistor Input 1. Connect a thermistor in series with a fixed resistor between
REF and ground.
No Connection
Reference Voltage Output. Provides 1V during measurements. High impedance when not
measuring.
External Thermistor Input 2. Connect a thermistor in series with a fixed resistor between
REF and ground.
Fan-Failure Output. Asserts low when either fan fails. Can be pulled up as high as 5.5V
regardless of VCC. High impedance when VCC = 0V.
Connect to GND or VCC to set POR state of the GPIO0.
Overtemperature Output. Active low, open drain. Typically used for system shutdown or
clock throttling. Can be pulled up as high as 5.5V regardless of VCC. High impedance
when VCC = 0V.
Power Supply. 3.3V nominal. Bypass with a 0.1µF capacitor to GND.
SMBus Serial-Data Input/Output. Pull up with a 10kΩ resistor. Can be pulled up as high
as 5.5V regardless of VCC. High impedance when VCC = 0V.
SMBus Serial-Clock Input. Pull up with a 10kΩ resistor. Can be pulled up as high as 5.5V
regardless of VCC. High impedance when VCC = 0V.
Fan Tachometer Input. Accepts logic-level signal from fan’s tachometer output. Can be
connected to a supply voltage as high as 12V, regardless of the supply voltage.
Fan Driver Output 2. The pullup resistor can be connected to a supply voltage as high as
12V, regardless of the supply voltage. See the PWM Output section for configuration.
_______________________________________________________________________________________ 5
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Dual-Channel Temperature Monitors and
Fan-Speed Controllers with Thermistor Inputs
Table 2. Slave Address Decoding (ADD0
and ADD1)
ADDO
ADD1
ADDRESS
GND
GND
0011 000
GND
High-Impedance
0011 001
GND
VCC 0011 010
High-Impedance
GND
0101 001
High-Impedance High-Impedance
0101 010
High-Impedance
VCC
VCC
GND
0101 011
1001 100
VCC
High-Impedance
1001 101
VCC VCC 1001 110
Note: High-Impedance means that the pin is left unconnected
and floating.
GPIO Inputs/Outputs and
Preset (MAX6616)
The MAX6616 has six GPIO ports. GPIO0 has a POR
control pin (PRESET). When PRESET is connected to
GND at POR, GPIO0 is configured as an output and is
low. When PRESET is connected to VCC at POR, GPIO0
is configured as an input. Since GPIO0 is a high-
impedance node in this state, it can be connected to a
pullup resistor and also serve as an output (high). The
rest of the GPIO ports, GPIO5–GPIO1, are configured
as high-impedance outputs after power-on, so they will
be in the high state if connected to pullup resistors. All
GPIOs are at their preset values within 1ms of power-
up. During power-up, GPIO1 and GPIO2 are low while
the remaining GPIOs go into high-impedance state.
Figure 8 shows the states of the GPIO lines during
power-up. After power has been applied to the
MAX6616, the GPIO functions can be changed through
the SMBus interface.
VCC
POR (INTERNAL)
GPIO0
GPIO1, GPIO2
GPIO3, GPIO4,
GPIO5
1ms
Figure 8. Power-On GPIO States
STATE DETERMINED BY
PRESET
HIGH-IMPEDANCE STATE
HIGH-IMPEDANCE STATE
Register Descriptions
The MAX6615/MAX6616 contain 32/34 internal regis-
ters. These registers store temperature data, allow con-
trol of the PWM outputs, determine if the devices are
measuring from the internal die or the thermistor inputs,
and set the GPIO as inputs or outputs.
Temperature Registers (00h and 01h)
The temperature registers contain the results of temper-
ature measurements. The value of the MSB is 128°C and
the value of the LSB is 1°C. Temperature data for ther-
mistor channel 1 is in the temperature channel 1 register
(00h). Temperature data for thermistor channel 2 (01h)
or the local sensor (selectable by bit D2 in the configura-
tion byte) is in the temperature channel 2 register.
Configuration Byte (02h)
The configuration byte register controls timeout condi-
tions and various PWM signals. The POR state of the
configuration byte register is 18h. See Table 4 for con-
figuration byte definitions.
Channel 1 and Channel 2 OT Limits (03h and 04h)
Set channel 1 (03h) and channel 2 (04h) temperature
thresholds with these two registers. Once the temperature
is above the threshold, the OT output is asserted low (for
the temperature channels that are not masked). The POR
state of the channel 1 OT limit register is 6Eh, and the
POR state of the channel 2 OT limit register is 50h.
OT Status (05h)
A 1 in D7 or D6 indicates that an OT fault has occurred
in the corresponding temperature channel. Only read-
ing its contents clears this register. Reading the con-
tents of the register also clears the OT output. If the
fault is still present on the next temperature measure-
ment cycle, the bits and the OT output are set again.
The POR state of the OT status register is 00h.
OT Mask (06h)
Set bit D7 to 1 in the OT mask register to prevent the
OT output from asserting on faults in channel 1. Set bit
D6 to 1 to prevent the OT output from asserting on
faults in channel 2. The POR state of the OT mask reg-
ister is 00h.
PWM Start Duty Cycle (07h and 08h)
The PWM start duty-cycle register determines the PWM
duty cycle where the fan starts spinning. Bit D2 in the
configuration byte register (MIN DUTY CYCLE) deter-
mines the starting duty cycle. If the MIN DUTY CYCLE
bit is 1, the duty cycle is the value written to the fan-
start duty-cycle register at all temperatures below the
fan-start temperature. If the MIN DUTY CYCLE bit is
______________________________________________________________________________________ 11
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| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet MAX6615.PDF ] | |
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