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MAX6640AEE Datasheet

  • MAX6640AEE

  • 2-Channel Temperature Monitor with Dual Automatic PWM Fan-Sp...

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2-Channel Temperature Monitor with Dual
Automatic PWM Fan-Speed Controller
MAX6640
Block Diagram
V
CC
Detailed Description
The MAX6640 monitors its own temperature and a
remote diode-connected transistor or the temperatures
of two external diode-connected transistors, which typi-
cally reside on the die of a CPU or other integrated cir-
cuit. The 2-wire serial interface accepts standard
SMBus write byte, read byte, send byte, and receive
byte commands to read the temperature data and pro-
gram the alarm thresholds. Temperature data can be
read at any time over the SMBus, and a programmable
alarm output can be used to generate interrupts, throt-
tle signals, or overtemperature shutdown signals.
The temperature data is also used by the internal dual
PWM fan-speed controller to adjust the speed of up to
two cooling fans, thereby minimizing noise when the
system is running cool, but providing maximum cooling
when power dissipation increases. RPM feedback
allows the MAX6640 to control the fan鈥檚 actual speed.
MAX6640
DXP1
DXN
DXP2
TEMPERATURE
PROCESSING
BLOCK
PWM
GENERATOR
BLOCK
PWM1
PWM2
OT
THERM
LOGIC
SMBus
INTERFACE AND
REGISTERS
FANFAIL
ALERT
TACH1
TACH2
GND
SDA
SCL
Write Byte Format
S
ADDRESS
7 bits
Slave Address: equiva-
lent to chip-select line of
a 3-wire interface
Read Byte Format
S
ADDRESS
7 bits
Slave Address: equiva-
lent to chip-select line
Send Byte Format
S
ADDRESS
7 bits
WR
ACK
COMMAND
8 bits
Command Byte: sends com-
mand with no data, usually
used for one-shot command
S = Start condition
P = Stop condition
Shaded = Slave transmission
/// = Not acknowledged
ACK
P
WR
ACK
COMMAND
8 bits
Command Byte: selects
which register you are
reading from
ACK
S
ADDRESS
7 bits
Slave Address: repeated
due to change in data-
flow direction
Receive Byte Format
S
ADDRESS
7 bits
RD
ACK
DATA
8 bits
Data Byte: reads data from
the register commanded
by the last Read Byte or
Write Byte transmission;
also used for SMBus Alert
Response return address
///
P
RD
ACK
DATA
8 bits
Data Byte: reads from
the register set by the
command byte
///
P
WR
ACK
COMMAND
8 bits
Command Byte: selects which
register you are writing to
ACK
DATA
8 bits
ACK
P
1
Data Byte: data goes into the register
set by the command byte (to set
thresholds, configuration masks, and
sampling rate)
Figure 1. SMBus Protocols
6
_______________________________________________________________________________________

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