ST ST7LIT15BY0 Bedienungsanleitung

February 2008 Rev 1 1/21

UM0497

User manual

USB Li-Ion battery charger evaluation board

Introduction

This document explains the functioning of the USB-based single cell Li-Ion battery charger

evaluation board which consists of a ST7260E2-based low-speed USB controller and a

battery charger based on the ST7LIT15BY0.

The evaluation board includes a power selector circuit to select the appropriate power

supply source and a step-up converter circuit based on the L6920 device to provide a fixed

output voltage to the USB controller. The power supply for the battery charger controller is

generated from the TL1431programmable voltage reference, keeping in mind the accuracy

requirement for charging. An additional current limiter is also included in series with a USB

power supply to show any incorrect behavior using a status LED.

A provision is provided on evaluation board such that any external low-speed USB controller

can control the operation of the charger, hence this system can be used with any low-speed

USB controller.

The charger used in the board utilizes a modified form of non-inverting buck-boost converter

to support the charging voltage requirement for single cell Li-Ion battery. This converter is

explained in more detail in AN2390.

This evaluation board represents a complete USB-based portable battery charging system

for a single cell Li-Ion battery, such as those used in MP3 players.

There are separate ICP connectors provided on the board to reprogram the USB controller

and charger controller.

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Contents UM0497

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Contents

1 Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.1 Package contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.2 Hardware description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.2.1 Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.2.2 Current limiter (ST890B) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.2.3 Precision supply for the charger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.2.4 Preferential power selector circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.2.5 Supply generation circuit for the USB controller . . . . . . . . . . . . . . . . . . . 6

1.2.6 Supply shutdown control circuit for the USB controller . . . . . . . . . . . . . . 6

1.2.7 Jumpers and connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.2.8 DC-DC converter circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2 Running the evaluation board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.1 Connecting to the PC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.2 Connecting the Li-Ion battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.3 Battery charging status monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.4 Controlling/changing the charging parameters . . . . . . . . . . . . . . . . . . . . . 11

3 Using the external USB controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4 Using the charger in standalone mode . . . . . . . . . . . . . . . . . . . . . . . . . 14

5 Warning/limitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

6 Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Appendix A Schematic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

6.1 USB battery charger BOM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

UM0497 List of figures

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List of figures

Figure 1. USB Li-Ion evaluation board (STEVAL-ISB003V1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Figure 2. Reference voltage generation for the charger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Figure 3. Power selector circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Figure 4. Supply generation circuit for the USB controller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 5. Connector J2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 6. Clock selector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 7. DC-DC converter circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Figure 8. Enumeration result . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Figure 9. USB Li-Ion evaluation board HID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Figure 10. Li-Ion battery 3-pin connector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Figure 11. Schematic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Getting started UM0497

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1 Getting started

1.1 Package contents

The USB Li-Ion battery charger evaluation board includes the following items:

●Hardware content:

– One evaluation board

●Documentation:

–Usermanual

1.2 Hardware description

Figure 1 below shows the snapshot of the evaluation board.

Figure 1. USB Li-Ion evaluation board (STEVAL-ISB003V1)

1.2.1 Power supply

The evaluation board is powered by a USB bus directly. As only 100 mA current is available

by default from the USB bus, the charger is inititally kept in shutdown mode. After proper

enumeration is done by the USB controller to increase the supply current limit to 500 mA,

the charger switches to ON to start charging the battery.

1.2.2 Current limiter (ST890B)

To provide additional information about the USB supply current, a current limiter (ST890B) is

kept in series of the USB supply. There is a STATUS LED (D3) connected with the FAULT

pin of this current limiter.

UM0497 Getting started

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This LED glows HIGH whenever the supply current increases from 500 mA. In the

evaluation board, the current limiter is used only to show the status of whether the current

limit is crossed or not, but it is not used to cut off the power supply.

1.2.3 Precision supply for the charger

Figure 2 shows circuit for the precision supply for the charger system. Here TL1431AI,

which provides 0.25% accurate reference voltage, is used to generate a precise voltage

supply for the charger system.

Figure 2. Reference voltage generation for the charger

With the help of this precision supply, we can easily achieve the 1% accuracy target which is

mandatory for Li-Ion charger systems.

1.2.4 Preferential power selector circuit

Figure 3 shows a preferential power selector circuit which is used to select the source power

supply for the USB controller.

Figure 3. Power selector circuit

This selector circuit works as follows. Whenever the USB supply (VBUS) is available, it is

used as the source supply. Battery power is only used when the USB supply is not available.

Getting started UM0497

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1.2.5 Supply generation circuit for the USB controller

Figure 4 shows L6920-based supply generation circuit for the USB controller. USB_SUPPLY

is the output voltage and VREG (output voltage of the power selector circuit as in

Section 1.2.4) is the input voltage of this circuit. The output voltage USB_SUPPLY is

programmable. In the evaluation board it is set at 4.5 voltage and depends on the ratio

R4/R9. Please refer to the L6920 datasheet for more details.

Figure 4. Supply generation circuit for the USB controller

LED (D4) is used to show the status of the input supply availability which glows whenever

the input supply falls below a certain threshold (determined by the voltage at LBI).

1.2.6 Supply shutdown control circuit for the USB controller

The STM1061 as shown in Figure 4 is used to control the shutdown operation of the L6920.

It puts the L6920 in shutdown mode whenever the input supply voltage falls below 2.5 V.

1.2.7 Jumpers and connectors

The following important jumpers control the operation of the evaluation board and are

explained according to their applications:

J2, JP1, JP3, JP12, JP13, JP14 and JP16 are used to select between the USB controller

available on the evaluation board and the external USB controller.

UM0497 Getting started

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The role of each individual jumpers is as follows:

●JP1: to connect USB_SUPPLY to the VDD pin of the USB controller

●JP3: to connect USBVCC to USBDM through a 1.5 kΩresistor.

●JP12: to monitor the availability of the VBUS signal.

●JP15: to connect to the SHDN_CHG pin of the charger. This is used to put the charger

in shutdown mode until proper enumeration is done.

●JP13, JP14: These are used to connect to the status pin

●JP16: to connect the USB supply pin to the demonstration board supply pin. Pin 1 of

this jumper is the USB supply pin (USB_VDD) and pin 2 is the demonstration supply pin

(VBUS). For the standalone charger, please connect the external supply to pin 2 of

JP16.

●J2: As shown in Figure 5, this is a 7-pin connector and can be used to connect to the

external USB controller.

Figure 5. Connector J2

Warning: You can connect to only one USB controller at a time. If you

want to use an external USB controller, you must open all the

jumpers (JP1, JP3, JP12, JP13, JP14 and JP15) required by

the USB controller.

J5 and J7: These are 3-pin connectors and are used to select between the ICC clock and

resonator clock. J5 is used for selecting the clock source for the USB controller (ST7260E2)

available in the evaluation board and J7 is used to select the clock source of the charger IC

(ST7LIT15BY0). As shown in Figure 6, if we short pin 1 and 2 then the external resonator is

used as the clock source and if we short pin 2 and pin 3, ICC clock is used as the clock

source. In general we short pin 1 and pin 2.

Figure 6. Clock selector

Getting started UM0497

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1.2.8 DC-DC converter circuit

Figure 7 shows the circuit diagram of the DC-DC converter circuit which is controlled by the

two PWM signals coming from the charger controller ST7LIT15BY0.

Figure 7. DC-DC converter circuit

This DC-DC converter provides power to the single cell Li-Ion (3-pin battery pack) based on

the battery voltage, current and temperature measurements. Please refer to AN2390 for

more details regarding this DC-DC converter circuit.

UM0497 Running the evaluation board

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2 Running the evaluation board

After ensuring that all the jumpers are connected correctly as explained in the previous

section, the evaluation board is ready to be used.

2.1 Connecting to the PC

As soon as you connect the USB connector to the evaluation board, you should find the

evaluation board enumerated as an HID device as shown Figure 8.

Figure 8. Enumeration result

And if you check the properties of all these HID devices, you should find the property of one

HID device as shown in Figure 9.

Running the evaluation board UM0497

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Figure 9. USB Li-Ion evaluation board HID

This ensures that the evaluation board is connected properly to the USB and now ready to

be used. Now we can proceed to the next steps.

2.2 Connecting the Li-Ion battery

The evaluation board is not provided with any specific slot in order to avoid making it

package specific. Instead a 3-pin connector is provided on the evaluation board as shown in

Figure 10.

Figure 10. Li-Ion battery 3-pin connector

You can either solder a particular slot to this connector and then connect the battery in that

slot, or if you are directly connecting the battery to the connector, please ensure that the

battery is properly connected as improper connection may affect the accuracy of the analog

measurement,thus affecting the overall accuracy of the charging.

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