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MAX9507 Evaluation Kit/Evaluation System
Load (Read Only)
The MAX9507’s load bit is a read-only bit that displays
the load status if load detection is enabled. When this bit
reads 1, a load is detected. To enable automatic load
detection, set ASPEN or ACPEN to 1. For more informa-
tion about the load bit, refer to the Video Load Detection
Circuitry section of the MAX9507 IC data sheet.
Load Change Flag Enable (LCFEN)
The MAX9507’s load change flag is enabled by check-
ing the LCFEN checkbox. When LCFEN is checked,
the appropriate command is written to the video load
detect register and the register contents are updated
on the display. This bit does not affect the LOAD I 2 C
bit. Refer to the MAX9507 IC data sheet for more
details about the load change flag.
Automatic Signal Path Enable (ASPEN)
The MAX9507’s automatic signal path control is enabled
by checking the ASPEN checkbox. This bit enables the
load detect circuitry and automatic control of the signal
path based on load status. When ASPEN is checked,
the appropriate command is written to the video load
detect register and the register contents are updated on
the display. Refer to the MAX9507 IC data sheet for
more details about automatic signal path enable.
Figure 2. MAX9507 EV Kit Software Interface Diagnostic Window
Automatic Charge Pump Enable (ACPEN)
The MAX9507 ’s automatic charge pump control is
enabled by checking the ACPEN checkbox. This bit
enables the load detect circuitry and automatic control
of the charge pump based on load status. When
ACPEN is checked, the appropriate command is written
to the video load detect register and the register con-
tents are updated on the display. Refer to the MAX9507
IC data sheet for more details about automatic charge
pump enable.
Simple I 2 C/SMBus Commands
There are two methods for communicating with the
MAX9507: through the normal user-interface panel
(Figure 1) or through the SMBus commands available
by selecting the Interface Diagnostic Window item
from the Action pulldown menu. The Maxim Command
Module Interface window pops up and includes a
2-wire interface tab that allows for execution of the
SMBusSendByte() and SMBusQuick() commands.
The SMBus dialog boxes accept numeric data in binary,
decimal, or hexadecimal. Hexadecimal numbers
should be prefixed by $ or 0x. Binary numbers must be
exactly eight digits. See Figure 2 for an illustration of
this tool.
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