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Maxim Integrated
│
9
MAX31790 Evaluation Kit Evaluates: MAX31790
www.maximintegrated.com
Writes
Each register of the device can be written to/from the GUI
either by the simple click on the radio button or the input
of a decimal value followed by a press of the associated
Write button. The writable registers are located in one of
the tabs, as defined in the previous Reads section.
Clicking on any radio button or drop-down list automati-
cally writes the selected value to the device. To verify a
successful write, perform a read that then updates the
field. To write a register that requires a numerical value,
such as TACH n Target Count or PWMOUT n Target
Duty, enter the decimal value desired for the non-
reserveddatabitsoftheregisters.Forexample,towrite
PWMOUT 1 Target Duty Cycle to a value of 39%, or
200 decimal (refer to the MAX31790 IC data sheet for
bit weighting), click on the FanChannel1 tab and enter
200 in the input box located to the left of the PWMOUT
1 Target Duty Cycle(40-41h) label and press the Write
(40-41h) button. This writes 64h to register 40h and 00h
to register 41h. Verify the write by pressing the Read
PWM Register button.
The GUI provides a very simple way to load all the device
registers from a text (.TXT) file. Under the Main Tab
sheet, press the Register Load button and provide a
previously saved Register Dump file or a modified
version of a previous dump. The register load file must
have the same format as the GUI-generated dump file.
General I2C Tab
The GUI provides a generic I2C tab (I2CMemory), which
is not required to evaluate the device. Use this tab if a
more flexible I2C transaction is required.
FULL_SPEED Input Signal Control
The GUI provides a method to control the FULL_SPEED
input to the device. On the right side of the GUI in the
DashBoard group box, there is a FULL_SPEED# section
with two radio buttons that toggles the logic level of this
signal between high and low.
FAN_FAIL Output Signal Monitor
The GUI provides a method to monitor the FAN_FAIL
output of the device. In the DashBoard group box, there
is a FAN_FAIL# Pin section that changes to reflect the
logic level of this signal.
Detailed Description of Hardware
User-Supplied Fans
The MAX31790 EV kit provides the flexibility to control
the speeds of up to six fans or monitor up to 12 fans.
The EV kit contains 12 fan headers (100 mil spacing) that
fans connect to. Refer to the MAX31790 IC data sheet
for various examples of fan configurations. Connect fans
tothecorrectGND,VFAN,TACH,andPWMheaders.In
a closed-loop fan-control configuration on FAN1–FAN6,
thejumper/shuntPWMn/FANn(J101,J201,J301,J401,
J501, and J601) must be populated. This connects the
PWM signal from the device to the fan header. To use
PWM outputs as tachometer inputs, open-loop monitor
configuration, on fan channel 1 for example, remove the
jumper/shuntonPWM1/Fan1(J101)andattachafanto
theFan1/Fan7headers.ConnectthedesiredPWMsignal
forFan1to thePWM1header and connectthedesired
PWM signal for Fan7 to the PWM7 test point. Properly
configure the device through the I2C port to reflect the
hardware configuration.
User-Supplied I2C interface
The USB-to-I2C master section of the EV kit is not
necessary for the proper operation of the device. If the
user wants to supply the I2C interface, the USB-to-
I2C master section of the EV kit can be disconnected
by removing resistors R7 and R8. Connect test points
SDA,SCL,andGND.TheFULL_SPEED and FAN_FAIL
signals from the device can also be routed to a different
master by removing resistors R9 and R10 and connecting
to the FULL_SPD, FAN_FAIL, and GND test points.
Change Startup Conguration Jumpers
All the startup configuration jumpers (J2–J8) are located
on the left side of the PCB and partitioned off by silk-
screen labeled STARTUP CONFIGURATION. Refer to
the MAX31790 IC data sheet for resulting device opera-
tion. After changing jumper configurations, a device POR
or a setting of the Reset bit in the Global Configuration
register is required for new configurations to take effect.