Texas Instruments LP875761-Q1, User Manual

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The Bucks section provides status information and enable controls for all the 4 buck cores. On the left of the
section are the check-boxes for the buck enable bits. The Mode field provides information on each of the buck
core and can have any of the values given in Table 4-1 :
Table 4-1. Mode Information
BUCK MODE
Disabled Buck state machine in 'disable'
Enabled Buck state machine in 'enable'
The Multiphase status info field tells whether a buck core is configured as a master or a slave. The "Current"
field gives the result of the buck converter load current measurement operation. Output currents of each buck
core and total output current of one or more of the masters are shown on the fields.
The System Flags / Interrupts section as well as the Interrupt bits and the Status bits sections give data on
system faults and warnings. If the interrupt is set for any reason the Interrupt active field shall show ‘1’ on red
background. The flag causing the interrupt will also be set on the Main tab. Interrupts on LP875761-Q1 can only
be cleared by writing '1’ to associated registers. Any individual flag can be cleared by clicking the
Clear button
next to each flag field. Some of the flags also have a mask bits. If Mask check-box of certain flag is checked, the
interrupt is not generated. The Status bits will show the current status of the faults.
The Power Good section is for Power Good pin control and indication. It includes the latched values of buck
Power Good Faults. These can be cleared with the Clear -button.
At the bottom of the GUI window is the Auto Write checkbox. If Auto Write is checked (default) any checking, un-
checking or pulldown menu selections will immediately launch I
2
C writes to the chip register(s). If not checked,
the user can update the chip registers to correspond the configuration selected on the GUI by clicking Write
Registers .
If Poll Status is selected the software sends a query to the LP875761-Q1 at a fixed interval in order to detect the
status of the chip, including operation mode, multi-phase status, and output current. If also the Poll Only Pins is
selected the software is monitoring only the state of Interrupt and Powergood pins. If Poll Status is not selected
or if Poll Only Pins is selected, user can read the registers by applying Read Registers . Bus Speed pulldown
menu selections are given in Table 4-2 below and is instantly applied for System I
2
C.
Table 4-2. I
2
C-Compatible Bus Support
BUS SPEED SELECTION EXPLANATION
Fast (400 kHz) Fast I
2
C-compliant operation at 400 kHz
High-Speed (3.4 MHz) HS I
2
C-compliant data transfer with master codes.
4.2 Other Tabs and Menus
The Tools pulldown menu hosts another way of accessing the LP875761-Q1 registers (see Figure 4-1 ). The
Direct Register Access tool can be used to read or write any register (see Figure 4-2 ). Selecting a register, the
bits appear on the right side Field View (see Figure 4-3 ). When moving mouse over bits in Field View, bits are
highlighted in the register view. Bits can be controlled either from register view or field view. Register settings can
also be saved to a file or pre-made register file can be loaded in the Direct Register Access tool. Registers can
be updated immediately or manually (see
Figure 4-4 ).
When using direct register access, TI recommends un-checking the poll status check-box. This way the GUI will
only do the reads and writes commanded from the direct access dialog.
www.ti.com GUI Overview
SNVU751 – OCTOBER 2020
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