MAX5945EVSYS Maxim Integrated, MAX5945EVSYS Datasheet - Page 11

• Manufacturer Part Number: MAX5945EVSYS
• Description: Power Management IC Development Tools Evaluation Kit/Evaluation System for the MAX5945
• Manufacturer: Maxim Integrated
• Series: MAX5945r

Table 10. Switch and Header J2 pin signals
The MAX5945 EV kit features four pushbutton switches
(S1, S2, S3, S4) to independently shut down each
channel’s respective power circuit. A reset pushbutton
(S5) is also provided to reset the MAX5945.
Header J2 (6-pin 0.100in center header) is available for
monitoring the SHDN1, SHDN2, SHDN3, SHDN4, and
RESET signals routed to the MAX5945 pins. Digital
ground is provided at the header on pin 6. See Table
10, which lists the specific switch and header pin sig-
nals that can be interfaced with a ribbon cable or test
leads. These signals are not isolated and are refer-
enced to DGND on the EV kit.
The AC disconnect detection function requires that the
EV kit’s DGND be connected directly to the GND. If the
AC disconnect detection function is not required, the
PC board trace shorting DGND-to-GND at resistor R72
pads can be cut open. Cutting open the PC board
shorting trace at resistor R72 allows DGND to be refer-
enced to a voltage potential anywhere from V
+ 60V). Additionally, when the PC board trace at R72
is cut open, the appropriate AC detection jumper
tables must be set and the OSC_IN pin on the
MAX5945 must be floating by removing jumper JU7.
See Tables 4, 7, and 8 for the appropriate jumper
settings to bypass the AC detection function. Refer
to the AC Disconnect Monitoring Oscillator Input sec-
tion in the MAX5945 data sheet for additional informa-
tion. If the AC disconnect detection function is required
again, install a 0Ω ±5% 1206 case size surface-mount
resistor at R72 pads and set the appropriate jumpers.
(Words in bold are user-selectable features in the soft-
ware).
A mouse or the tab key is used to navigate various items
on the Main Window. Upon starting the program, the
Detailed Description of Software
Bypassing AC Disconnect and the DGND-to-GND
SWITCH
None
S1
S2
S3
S4
S5
MAX5945 Evaluation Kit/Evaluation System
______________________________________________________________________________________
SIGNAL
SHDN1
SHDN2
SHDN3
SHDN4
RESET
DGND
Connection (Resistor R72)
SHDN and RESET Signals
Software Startup
HEADER J2 PIN
EE
1
2
3
4
5
6
to (V
EE
MAX5945 EV kit software starts in the Auto Read state.
The software automatically detects the Slave Address
and begins reading the contents of each register in the
MAX5945. The register’s contents are placed on the
appropriate line of the Register Read tables in binary
and hexadecimal format. If data changes between the
next register read, the updated register hexadecimal
data is displayed in red and blinks four times. The blink
rate can be changed in the View|Red Hex Data Blink
Rate menu. The left status bar at the bottom of the main
window provides the MAXSMBus interface board status.
The center status bar provides the current EV kit and
macro engine status.
When the Auto Read checkbox is checked, the pro-
gram continuously updates the main window registers
and is operating in the autoread state. In the autoread
state, data can be written to the MAX5945 by entering
or selecting the desired data in the Register Address
and Hexadecimal or Binary Data combo boxes.
Selecting the Write Byte button writes the combo box
data to the MAX5945. To perform an immediate register
read, enter, or choose the desired Register Address,
and choose the Read Byte button. Hexadecimal or
binary data may be entered into the Hexadecimal or
Binary Data combo boxes and then the alternate
combo box displays the corresponding number in the
respective number base.
If the Auto Read check box is unchecked, the pro-
gram’s main window displays register data from the last
read. To obtain current data, a Read Byte must be per-
formed after selecting the appropriate register address
from the Register Address combo box. The autoread
state does not read the clear on read (COR) registers.
A macro can be run after loading the file from the
File|Open Macro menu. The opened macro is dis-
played in the upper half of the Macro edit box and has
an smb file extension. Selecting the Run button runs
the macro to completion and displays the output in the
Macro Script Output edit box field. Each edit box can
be sized relative to the other half using the splitter bar
above the Script Output text. Selecting the Single
Step button instead of the Run button causes the
macro to execute a single line with each activation of
the Single Step button. The Reset button is used to
reset the macro script engine and clear the Macro
Script Output edit box field. A macro can be run
regardless of the Auto Read checkbox status. A macro
can be run immediately after opening by using the
File|Open/Run Macro menu, selecting the desired
macro to run, and clicking on the Open button. Selecting
the Cancel button exits this feature.
Autoread/Run Macro State Controls
11