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MAX9591 Evaluation Kit
Register banks A and B are selectable using the radio
buttons in the Output Bank Select group box. Register
values are modified and loaded to registers using the
buttons, edit boxes, and scrollbars of the Bank _
Register Settings tabs where _ is either A or B .
I 2 C Address Setting
The MAX9591’s I 2 C slave address is displayed in the
status bar of the software window and the I2C Address
Setting drop-down list. If an address is manually
selected in the drop-down list, the software verifies the
address and changes the address displayed appropri-
ately. If no acknowledge is received from the EV kit, a
pop-up window is opened directing the user to properly
set jumper JU6 on the EV kit. If the Auto Detect
Address checkbox is checked, the software automati-
cally detects the I 2 C address of the MAX9591.
Upper and Lower DAC Output Voltages
The upper and lower DAC output voltages are generat-
ed using an on-board resistor-divider network. The user
can also apply external references to the REFU_H,
REFU_L, REFL_H, and REFL_L, and AGND PCB pads.
The voltages on these four pads MUST be captured and
typed into the appropriate edit boxes in the Reference
Voltages (V) group box for the calculated DAC output
voltages shown in the Upper DAC Channels/Lower
DAC Channels group boxes to be correct.
The transfer function for the upper DAC channels is:
Output Register Values
Each DAC channel’s register value can be set in three
different ways within the Upper DAC Channels / Lower
DAC Channels group boxes by:
1) Moving the channel’s scrollbar.
2) Typing register values directly into the channel’s
Reg Value edit box (decimal 8-bit equivalent).
3) Typing the expected output voltage in the chan-
nel’s Output (V) edit box. The software uses a reg-
ister value that generates a voltage closest to the
desired voltage value.
When a register value is changed, the corresponding
field changes its color to red. A user should synchro-
nize the GUI fields and actual device registers by
pressing either the channel’s Load button (in single
mode) or the Load All Values To Registers button (in
burst mode).
The Load All Reg Values From File button is used to
load all the register values and reference voltages from
a text file. The Save All Reg Values To File button is
used to save all the register values and reference volt-
ages on the current GUI to a user-named text file.
Register read/write operations can take place regard-
less of the output bank setting; for example, the user
can change bank B registers when bank A is buffered
to the outputs.
V OUT = REFU_L +
D
256
× (REFU_H - REFU_L)
Register Addressing Mode
The Burst and Single radio buttons in the Register
Addressing Mode group box set the MAX9591 soft-
The transfer function for the lower DAC channels is:
ware operation mode.
V OUT = REFL_L +
D
256
× (REFL_H - REFL_L)
When the Burst radio button is selected, all registers
for a single bank are updated using the Load All
Values To Registers or Load All Reg Values From
In both equations, D is the decimal register value. Refer
to the MAX9591 IC data sheet for more details.
When the evaluation software is run for the first time, the
reference input-voltage values in the Reference
Voltages (V) group box are loaded from an initialization
file (REF.INI). When the program is closed, the current
values are logged in to the initialization file. The next
time the program is run, the latest values are loaded
automatically.
Output Bank Select
The Bank A , Bank B , and A, B Alternating radio but-
tons in the Output Bank Select group box choose the
set of reference voltages buffered to the outputs
between bank A, bank B, or alternating between banks
A and B, with 1s hold time for each bank.
File buttons. The individual register’s Load buttons are
disabled.
When the Single radio button is selected, single regis-
ter values are updated using the individual register’s
Load buttons. The Load All Values To Registers and
Load All Reg Values From File buttons are disabled.
Register Mode I 2 C Activity
The Register Mode I2C Activity group box is used for
the convenience of debugging when the Single radio
button is selected. When an individual register is writ-
ten, the bits sent to the MAX9591 through the I 2 C inter-
face are displayed.
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