Texas Instruments LM10502 User manual

User's Guide
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1 General Description
The LM10502 is an advanced PMU containing two configurable, high efficiency buck regulators for
supplying variable voltages plus a low drop-out linear regulator. The device is ideal for supporting ASIC
and SOC designs for SSD and Flash drives.
2 Evaluation Kit Overview
The LM10502 evaluation kit is a single-board solution allowing control and measurement from a user
interface software. The board operates either from PC control via the USB port or as a separately
powered stand-alone evaluation platform.
The evaluation kit consists of
• LM10502 Evaluation board REV 1
• USB Interface cable
• Evaluation software
• A copy of the LM10502 User Guide (this document)
Figure 1. LM10502 Evaluation Board
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3 Evaluation Software
The LM10502 evaluation software is supplied together with documentation regarding the circuit. Copy the
folder “LM10502” to your PC’s hard disk. The software is run by double-clicking the icon of the
LM10502.exe found in the folder. The software does not require any installation.
The evaluation software allows control of all registers necessary to program the device. To simplify use of
the software, the registers are set by directly named controls. The user does not need the register value
as this is taken care of by the software; e.g., to change BUCK1 output voltage to 1.2V, choose the related
value, and software will send the correct value to the BUCK1 control register. To observe corresponding
change in the probes, the Poll Status must be set.
4 Hardware Setup
Please use ESD protection when handling the evaluation boards to prevent any damage due to ESD
events!
Connect the LM10502 Evaluation board to the USB port of a PC using the USB cable.
When the USB board is plugged in for the first time, the operating system prompts for “New hardware
found” and installs the USB driver. If this does not happen, try unplugging and plugging in the cable again.
Always disconnect the USB cable from the computer when changing jumper settings.
If the evaluation board is not responding or the evaluation software hangs up disconnect the USB cable
for 5 seconds.
5 Using the Evaluation Software
Figure 2. System Settings Tab
The graphical user interface has a main screen with 2 tab screens which allow control and indication for
different functions of the device.
Once the evaluation board is connected to the PC, device can be controlled via the software interface.
The LM10502 should become active as soon as the USB cable is plugged in. When device starts up
correctly, a yellow LED LD1 and green LED LD3 is illuminated. All the device functions can be accessed
via the control buttons.
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5.1 Main Screen (Figures 2 & 3)
Right and lower part of screen is visible as the background for both tab screens. Common functions can
be controlled here.
5.2 Right Part of Screen
The Probes frame contains results of voltage measurements. Values can be read the moment when the
device becomes active.
The Pins frame shows the status of the IRQ and Reset pins.
Pressing the RESET_DEVICE button causes a 50-ms negative pulse in reset pin.
5.3 Lower Part of Screen
This part of the screen contains following check-boxes and buttons:
Poll status checkbox:
Allows continuous reading of the evaluation chip status register, state of I/O pins, and voltage
measurement results
Auto write checkbox:
If this box is checked, any change to registers will be written to the device immediately. Otherwise, user
must press Write regs button to update registers. This way, user can change values in several registers
and update changes simultaneously.
Update button:
Reads content of every register and updates screen accordingly.
Write regs button:
If Auto write checkbox is disabled, user can press this button to update content of every register.
There is a status bar at the bottom of the screen. It shows if connection to evaluation board is established,
and information about the last register write/read operation. Register information is given in the format:
‘’R/WXX:YY’’, where first letter indicates operation (read or write), XX is register address and YY is data.
Figure 3. Log Tab
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5.4 System Settings Tab (Figure 2)
Selecting this tab allows access to the controls of Buck1, Buck2, Comparator, LDO Sleep Mode, and
Interrupt pin polarity. It also shows a log of occurred events.
In the System Interrupt frame, the user can choose to enable the output monitor function in the Enables
checkboxes and can observe the output Status bits. Also, if the Poll status checkbox is checked at lower
part of screen, this frame will get continuous status updates (1 update/sec).
In the Buck1 and Buck2 frames the user can set the output voltage of the buck regulator, enable
regulator for Buck1, or force it to PWM mode.
In the Comparator frame the user can enable the comparator, set the threshold voltage, and enable
hysteresis.
The Misc frame contains controls for LDO Sleep Mode bit and Interrupt pin polarity.
5.5 Log Tab (Figure 3)
This tab records all SPI transfers. The user can copy write or read sequences to clipboard. The log
window can be cleared by pressing clear button.
5.6 Menus
Under “File” menu user can save and load contents of register map. Under “Tools” menu user can open
“Direct Register Access” dialog, shown in Figure 4.
Figure 4. Direct Register Access
Binary data may be written and read from the registers. Use hexadecimal values in address and data
fields. Correct data value can also be created by setting and clearing individual bits. Value is immediately
written to the device by pressing ‘Write’ button and read from the device by pressing ‘Read’ button. Next
to each bit is a description of that particular bit.
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6 Using the Evaluation Hardware
Connectors are provided to allow a battery connection and output voltage measurement. Jumpers allow
user-selectable or USB-controlled settings for device functions.
6.1 Power Supply
The evaluation board may be powered from a battery connector or from the USB interface.
Set jumper between J2 pin2 and TP36 to use 5V supply from USB. Maximum current for USB supply is
500 mA. Alternatively moving the jumper to pins 1 and 2 will provide a 3.3V supply to the device.
Table 1. Battery Connector J2
Pin Function
1 VCC3V3
2 Battery (+) terminal
3 GNC
TP36 VCC5V
6.2 Control
A green and a yellow LED will be illuminated once the LM10502 has started up. Place a jumper on JP1 to
connect VIN_IO to LDO_OUT. Otherwise, to power VIN_IO from the on-board 3.3V supply, place a jumper
on JP11; JP1 should be open in this case.
6.3 Logic Connectors
The logic signals can be controlled either by the evaluation software or externally through connector
labeled. Set the jumper block shown accordingly.
Figure 5. Logic Signal Jumper Detail
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Table 2. Logic Jumpers
Jumper Control
JP2 SPI_CS Int / Ext
JP3 SPI_DI Int / Ext
JP4 SPI_DO Int / Ext
JP5 SPI_CLK Int / Ext
JP7 IRQ Int / Ext
JP8 RESET Int / Ext
Table 3. Other Jumper Connections
Jumper Option
JP1 Connect LDO_OUT to VIN_IO
JP6 Connect VIN to VCOMP
JP9 Connect LDO_VIN to VIN via JP6 and VCOMP
6.4 Board Power INPUT and OUTPUT Connectors
Table 4. Connector J3
Pin Function
1 VIN_B1
2 VIN_B1 sense
3 GND
Table 5. Connector J4
Pin Function
1 BUCK1
2 BUCK1 sense
3 GND
Table 6. Connector J5
Pin Function
1 VIN_B2
2 VIN_B2 sense
3 GND
Table 7. Connector J6
Pin Function
1 BUCK2
2 BUCK2 sense
3 GND
Table 8. Connector J7
Pin Function
1 LDO_VIN
2 LDO_VIN sense
3 GND
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Table 9. Connector J8
Pin Function
1 VCOMP
2 VIN_B1 sense
Table 10. Connector J11
Pin Function
1 VIN
2 VIN sense
3 GND
Table 11. Connector J12
Pin Function
1 LDO
2 LDO sense
3 GND
6.5 User Connector J1
For accessing the signals externally via this connector, jumpers from JP2 to JP5 and JP7 and JP8 should
be set to EXT position.
Table 12. User Connector Pins
Pin Function
1 VIN_IO
2 SPI_CS
3 SPI_DI
4 SPI_DO
5 SPI_CLK
6 GND
7 RESET
8 IRQ
9
10 GND
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7 Evaluation Board Layer
Figure 6. LM10502 Board Top Layer
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8 Schematics of the LM10502 Evaluation Board
Figure 7.
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Figure 8.
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