MAX6660EVKIT View Datasheet(PDF) - Maxim Integrated
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MAX6660EVKIT Datasheet PDF : 7 Pages
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MAX6660 Evaluation System/Evaluation Kit
Note: Words in boldface are user-selectable features in
the software.
The program continually polls the device for new tem-
perature data and status, and monitors for alert condi-
tions. To disable the continuous polling of data,
uncheck the Automatic Read checkbox. To change
the THIGH and TLOW threshold comparison registers,
select the appropriate data field and type in the new
value. Pressing Enter after typing in the new values
updates the internal registers.
If an interrupt condition is generated by the tempera-
ture crossing one of the alarm threshold levels, the
message ALERT appears. To clear the interrupt, first
eliminate the condition that caused it and then click on
Read Alert. This action reads the Alert Response
address, returns the value of the current MAX6660
slave address, and clears the interrupt. Note: The
least-significant bit of the address is the read/write sta-
tus bit; therefore, the address returned is 1 higher.
Simple SMBus Commands
There are two methods for communicating with the
MAX6660: through the normal user-interface panel or
through the SMBus commands available from pressing
the MAXSMBUS button. A display pops up that allows
the SMBus protocols, such as Read Byte and Write
Byte, to be executed. To stop normal user-interface
execution so that it does not override the manually set
values, turn off the update timer that slaves the pro-
gram to the conversion rate by unchecking the
Automatic Read checkbox.
The SMBus dialog boxes accept numeric data in bina-
ry, decimal, or hexadecimal. Hexadecimal numbers
should be prefixed by $ or 0x. Binary numbers must be
exactly eight digits.
Note: In places where the slave address asks for an 8-
bit value, it must be the 7-bit slave address of the
MAX6660 as determined by ADD0 and ADD1 with the
last bit set to 1 for a read operation and zero for a write.
Data Logging
Check the Data Logging checkbox to activate data
logging. Data logging saves temperature and status
data to a text file that includes a time/date stamp next
to each data point. If Automatic Read is enabled, data
is sampled at 2Hz; however, the data is logged to the
file only if either the temperature or status change. This
slows the growth of the data-logging file. When
Automatic Read is disabled, the data is logged each
time the Read All button is clicked. To stop data log-
ging, uncheck the Data Logging checkbox.
Jumper and Switch Settings
Two jumpers set the MAX6660 slave address. The
default address is 1001 110 (ADD0 = ADD1 = VCC).
JU1 corresponds to ADD0 and JU2 corresponds to
ADD1; see Table 1 for a complete list of addresses.
The MAX6660 must undergo a power-on reset for the
new address to become effective.
Note: The first 7 bits shown are the address. Y (bit 0) is
the SMBus read/write bit. This bit is a 1 for a read oper-
ation and zero for a write.
Table 1. JU1 and JU2 Shunt Settings for
SMBus Address
SHUNT LOCATION
JU1 (ADD0)
2-3
2-3
2-3
Open
Open
Open
1-2
1-2
1-2
JU2 (ADD1)
2-3
Open
1-2
2-3
Open
1-2
2-3
Open
1-2
MAX6660
ADDRESS
0011 000Y
0011 001Y
0011 010Y
0101 001Y
0101 010Y
0101 011Y
1001 100Y
1001 101Y
1001 110Y
A slide switch, S1, is provided as a means to force a
power-on reset of the MAX6660. This switch disables
Table 2. JU3 Shunt Settings for STBY
SHUNT
LOCATION
1-2
2-3
STBY PIN
FUNCTION
Connected to VCC In operate mode
Connected to GND In standby mode
power to the device.
Fan Control
The MAX6660 incorporates a closed-loop fan controller
that regulates fan speed with tachometer feedback. It
compares temperature data to fan threshold tempera-
ture and gain setting, resulting in automatic fan control
proportional to the remote-junction temperature.
Figure 1 shows the registers that control the fan. The
register values must be calculated for the selected fan.
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