Texas Instruments LM10502 Manual de usuario

User's Guide

SNVU277–January 2014

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

SNVU277–January 2014

Evaluation Software

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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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Using the Evaluation Software

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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Using the Evaluation Software

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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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Using the Evaluation Hardware

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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Using the Evaluation Hardware

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

10 GND

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Evaluation Board Layer

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7 Evaluation Board Layer

Figure 6. LM10502 Board Top Layer

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Schematics of the LM10502 Evaluation Board

8 Schematics of the LM10502 Evaluation Board

Figure 7.

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Schematics of the LM10502 Evaluation Board

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Figure 8.

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