ST ST7LIT15BY0, ST7260E2 User Manual

UM0497

User manual

USB Li-Ion battery charger evaluation board

Introduction

This document explains the functioning of the USB-based single cell Li-Ion ba tte ry charger
evaluation board which consists of a ST7260E2-based low-speed USB controller and a
battery charger based on the ST7LIT15BY0.

The eva luation 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 an y incorrect behavior using a status LED.

A provision is provided on e v alua tion board such th at any ex ternal 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 utili zes a modifi ed f orm of non-inv erting buc k-boost con v erter
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 th ose used in MP3 players.

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

February 2008 Rev 1 1/21

www.st.com

Contents UM0497

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

2/21

UM0497 List of figures

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

3/21

Getting started UM0497

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:

–User manual

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 defaul t from the USB bus, the charger is inititally kept in shutdown mode. After proper
enumeration is done by the USB contro ller 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 pro vide additional inf ormation about the USB supply current, a current limiter (ST890B) is
kept in series of the USB supply. Th ere is a STATUS LED (D3) connected with the FAULT
pin of this current limiter.

4/21

UM0497 Getting started

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 targ et 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 use d to select the source pow er

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 availab le .

5/21

Getting started UM0497

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 (out put 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.

6/21

UM0497 Getting started

The role of each individual jumpers is as follows:

● JP1: to connect USB_SUPPLY to the V

● JP3: to connect USBVCC to USBDM through a 1.5 kΩ resistor.

● 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

pin of the USB controller

DD

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_V

) and pin 2 is the demonstration supply pin

DD

(VBUS). For the sta ndalone 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 betw een the ICC clock and
resonator clock. J5 is used f or sele cting the clo c k source f or the USB controlle r (ST7260E2)
available in the evaluation board and J7 is used to select the cloc k 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

7/21

Getting started UM0497

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 po w er to the single ce ll Li-Ion ( 3-pin batt ery pack) based on
the battery voltage, current and temperature measurements. Please refer to AN2390 for
more details regarding this DC-DC converter circuit.

8/21

UM0497 Running the evaluation board

2 Running the evaluation board

After ensuring that all the jumpers are connected correctly as explained in the previous
section, the ev aluation 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 de vices , y ou should find th e property of one
HID device as shown in Figure 9.

9/21

Running the evaluation board UM0497

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 eval uation board is not provided with any specific slot in order to avoid making it
package specific. Instead a 3-pin connector i s pro vided on the evaluatio n board as sho wn 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.

10/21

UM0497 Running the evaluation board

2.3 Battery charging status monitoring

There are two LEDS available (D8 and D9) on the evaluation board. Table 1 explains the
behavior of these status LEDs according to the charging status.

Table 1. Charging LED status

SL NO Charging status Red LED (D8) Green LED (D9)

1 Battery not present / Idle OFF OFF
2 Charging ongoing ON OFF
3 Charging done OFF ON
4 Error in charging ON ON

Note: An error condition occurs for following reasons:

Temperature (heat or cold condition)
Short-circuit
Bad battery when the impedance of the battery becomes very low.

Note: For the condition due to a bad battery, if impedance of the battery becomes very high, then

current does not flow through the batte ry. In this case charging is stopped and the status
LED shows that charging is done.

2.4 Controlling/changing the charging parameters

The variables inTable 2 are used to control different charging parameters.

Table 2. Controlling/ changing the charging parameters

File name: Bc.h

Sl No

Parameter

name

Function Formulae Comments

To define constant voltage

1LION_VF_H

threshold to fix the constant

voltage level.

2 LION_VFAST

V oltage to s witch from pre-charge

level

3 LION_VFAIL Not used
4 LION_VF_L Not used

5LION_VSC

6 LION_VSAT

Used along with LION_TFAIL to

define bad battery condition

V oltage to s witch from pre-charge

level

threshold

⎛⎞

----------------------------

X

⎝⎠

23.6}⋅{

threshold

⎛⎞

----------------------------

X

⎝⎠

23.6}⋅{

threshold

⎛⎞

----------------------------

X

⎝⎠

23.6}⋅{

threshold

⎛⎞

----------------------------

X

⎝⎠

23.6}⋅{

1024⋅=

]

)

1024⋅=

]

)

1024⋅=

]

)

]

)

X = 213 for 1.5V threshold.

1024⋅=

For example:

X = 597 for 4.2 V

threshold.

For example:

X = 469 for 3.3V pre-

charge threshold.

For example:

For example:

X = 469 for 3.3V pre-

charge threshold.

11/21

Running the evaluation board UM0497

Table 2. Controlling/ changing the charging parameters (continued)

File name: Bc.h

7 LION_ICONST

8 LION_ITRI_1

Current level during constant

current charging

Constant current level during pre-

charging phase

9 LION_ITRI_2 Not used

10 LION_IFAIL Short-circuit current threshold

11 LION_ISA T Current threshold to end charging

LION_VHEAT_

12

LION_VHEAT_

13

UP

DOWN

Heat indicator threshold

Cold indicator threshold

CurrentThre

Y

=

-----------------------------------

2.5

CurrentThre

Y

=

-----------------------------------

2.5

CurrentThre

Y

=

-----------------------------------

2.5

CurrentThre

Y

=

-----------------------------------

2.5

⎧

R1

-----------------------------------

Z

=

⎨

10kΩ R1+()}

⎩

⎧

R1

-----------------------------------

Z

=

⎨

10kΩ R1+()}

⎩

-

-

-

-

.

256

.

256

For example:

Y = 120 for 300 mA

charging current.

For example:

Y = 20 for 50 mA pre-

charging current.

For example:

Y = 140 for 350 mA short

circuit current.

For example:

Y = 18 for 45 mA short

circuit current.

For example:

Z = 80 for 45 Celsius

degree temperature (Here

R1 is in kΩ).

For example:

Z = 195 for 0 Celsius

degree temperature (Here

R1 is in kΩ).

14 LION_TFAIL Used with LION_VSC

15 LION_TEXP Expiration in minutes

(expected time expiration

value in minutes)

W =

For example:

2

W = 150 for a 5-hour time

expiration.

12/21

UM0497 Using the external USB controller

3 Using the external USB controller

Before using the external USB controller, you must remove all jumpers (JP1, JP3, JP12,
JP13, JP14 and JP15). After that you need to do the connections as mentioned in

Section 1.2.7. To use the external USB controller in order to control the charging operation,

you must do the following steps:

1. First disable the SHDN_CHG pin by making it low to switch off the charger.

2. Do the proper enumeration of the USB cell to increase the current limit up to 500 mA.

3. During battery charging, as the USB controller is also being powered by a USB, the
power consumption of the system should be kept at less than 150 mA, otherwise we
may not achieve the targeted 250 mA charging current.

4. After completing steps 1, 2 and 3, enable the SHDN_CHG pin to high to enable
charging operation.

5. Connect the batter y.

6. Start monitoring the status of the battery charging by monitoring the status pin ST1 and
ST2. Using these status pins, y ou can contro l the activity of the external USB controller
to minimize the current consumption while the battery is being charged.

7. Disable the SHDN_CHG pin again by making it low to reduce any consumption by the
charger.

8. Follow steps 1 to 7 to charge another batter y.

13/21

Using the charger in standalone mode UM0497

4 Using the charger in standalone mode

You can use the charger available in this evaluation board in standalone mode as well. In
standalone, it provides an option of developing a low-cost battery charger which is capable
of charging a single cell Li-ion battery from a 5 V power supply.

To use this evaluation board in standalone mode, do the following steps:

1. Select the external power supply (5 V, 1 A) by connecting the positive pin of this supply
to pin 2 of jumper JP16 (see Section 1.2.7) and the negative pin to ground (see

Figure 11: Schematic).

2. Remove jumpers JP1, JP3, JP12, JP13, JP14 and JP15 to isolate the USB controller.

3. Connect the SHDN_CHG pin (pin 2 of JP15) to VBUS (pin 2 of JP16) to enable the
charger operation (see Figure 11: Schematic).

The charger is now enabled and ready to be used in standalone mode.
If you connect the batte ry as mentioned in Section 2.2, then its presence is detected within a

few seconds and the charging operation starts.
Again as mentioned in Section 2.3, LED8 and LED9 are used to show the charging status.

14/21

UM0497 Warning/limitation

5 Warning/limitation

The limitations/warnings in using this evaluation board are as follows:

1. The charging current is limited to 300 mA value using the USB supply. You can use an
external supply for increasing the charging current by using it in standalone mode as
mentioned in Section 4.

2. There is no protection for reverse battery polarity connection, but it can be provided
according to customer requirements.

6 Reference

1. AN2390: A Flexible Universal Battery Charger.

15/21

Schematic UM0497

Appendix A Schematic

Figure 11. Schematic

VREG

C1

47uF/16VC147uF/16V

1

C2

R5

200kR5200k

500mA

R40R4

0

OPTIONAL

8

L1

OUT

10uHL110uH

U2

L6920DU2L6920D

LX

7

1 2

LBI

R3

18kR318k

2

2

VREG USB_SUPPLY

D1

1N5817D11N5817

M1

STT3PF30LM1STT3PF30L

3

pwr select

BATTOUT

1

TP1TP1

VBUS

8

FAULT

R2

100kR2100k

U1

IN1IN2ON3GND

4

JP16JP16

1 2

C3

4.7uF/25VC34.7uF/25V

USB VDD

USB-B

5

56

R371MR37

1M

J2

USB_SUPPLY

47uF/16VC247uF/16V

3

5

1

FB

LBO

REF

4

6

2

C5

R6

7

R8

100kR8100k

R7

USBDP

USBDM

1

C24

C24

1234567

ST2

USBDM

USBDP

2STR2215Q22STR2215

R10

10k

R10

10k

R90R9

0

SHDN

R13

R13

GND

1

100nFC5100nF

16kR616k

R111kR11

1k

VBUS

C23

200uF

C23

200uF

2

C7

100nFC7100nF

13

5

SET

OUT6OUT

4

C6

1uF/16VC61uF/16V

2STR2215Q12STR2215

10kR710k

C4

100nFC4100nF

432

100nF

100nF

D D

SHDN_CHG

ST1

Q2

OPTIONAL

10k

10k

2

1

OUT

D2

1

2

R43

R43

ST890BDRU1ST890BDR

Q1

J1

CON4J1CON4

8

VBUS_MON

R151kR15

1k

C8

100nFC8100nF

2

3

VSS

VCC

U3

1N5817D21N5817

POT

POT

R141kR14

1k

CON8J2CON8

STM1061N25WX6FU3STM1061N25WX6F

VDD_LITE

VBUS

R28

10k

R28

10k

VBUS

USBDM

20

PA0/MCO

V_AIN1

2

R2482R24

ICC_DATA

19

1

I_AIN3

R25

R25

C13

C13

82

SW1_PWM

PA1(25mA)/SDA/ICCDATA

ICC_CLK

17

18

PA3/EXTCLK

PA2(25mA)/SCL/ICCCLK

RESET_ST7260

C14

100nF

C14

100nF

2

R26

R26

0.5/1W(1%)

0.5/1W(1%)

T_AIN2

2

5k(0.5%)

5k(0.5%)

100nF

100nF

1

Q5

2STR1215Q52STR1215

R27 1KR27 1K

SW2_PWM

VBUS_MON

JP12JP12

1 2

16

JP13JP13

VPP_7260

C15

100nF

C15

100nF

1

Q6

2STR1215Q62STR1215

14

PA5/ICAP2/IT215PA4/ICAP1/IT1

1 2

1 2

R404k7 R404k7

ST2

ST1

R2956R29

56

FOR 1A TRACK

JP15JP15

PA7/OCMP2/IT4

SHDN_CHG

1 2

13

PB0(10mA)

12

USB_SUPPLY

JP14JP14

4k7

4k7

VDD_LITE

R39

R39

DC TO DC

B B

JP3JP3

1 2

USBDP

USBDM

1k5

1k5

R21

D4

LEDD4LED

1

VREG

C9

2

D5

TL1431AIZD5TL1431AIZ

50

R1650R16

R17

4k4(0.1%)

R17

4k4(0.1%)

D3

LEDD3LED

R18

R18

VBUS

R21

12
11

10
9
8
7
6
5
4
3
2
1

J4

CON12J4CON12

22

23

21

24

C10

100nF

C10

100nF

ST72F60E2M1

ST72F60E2M1

C11

100nF

C11

100nF

1 2

12

11

10
9
8
7
6
5
4
3
2
1

J3

CON12J3CON12

USB_SUPPLY

100nFC9100nF

1

R19

10k(0.1%)

R19

10k(0.1%)

D6

Q3

2STR2215Q32STR2215

330

330

R20

100

R20

100

Vssa

USBDP

USBDM

USBVcc

U4

U4

VDD1OSCOUT2OSCIN3VSS4TDO/PC15RDI/PC06RESET7IT7/PB6(10mA)8Vpp/TEST9PB3/(10mA)10PB2/10(mA)11USBOE/PB1(10mA)

OSC_IN

OSCOUT

JP1JP1

1 2

3 PIN BATTERY

FOOTPRINT

BT1

BATTERY

BT1

BATTERY

12

3

BATTOUT

R22

5k(0.5%)

R22

5k(0.5%)

C12

C12

470uF/16V

470uF/16V

1N5819D61N5819

L2

33uHL233uH

VBUS

D7

1N5819D71N5819

R23

470

R23

470

Q4

2STR1215Q42STR1215

C C

R33

10k

R33

10k

VPP_7260

VPP_7260

ICC_DATA

ICC_CLK

RESET_ST7260

J6

J5

ST7FLIT15BY0M6U5ST7FLIT15BY0M6

U5

VDD_LITE

CON10AJ6CON10A

1 2

3 4

5 6

7 8

9 10

USB_SUPPLY

3
2
1

CON3J5CON3

Y2

OSCOUT

12MHZY212MHZ

OSC_EXT

C20

C20

C16

33pF

C16

33pF

12

RESET

RESET

10nF

10nF

SW1

SW1

C19

C19

1 2

4k7

4k7

R30

R30

RESET_ST7260

R41

100k

R41

100k

SW1_PWM

OSC1_LITE

OSC2_LITE

16

14

13

15

OSC2/PC1

PA0(HS)/LTIC

OSC1/CLKIN/PC0

PA2(HS)ATPWM0

VSS1VDD2RESET3COMPIN+SS/AIN0/PB04SCK/AIN1/PB15MISO/AIN2/PB26MOSI/AIN3/PB37COMPIN-/CLKIN/AIN4/PB4

ST1

RESET_LITE1BX

1 2

C17

100nF

C17

100nF

Y1

OSC2_LITE

16MHZY116MHZ

OSCEXT_LITE

C18

33pF

C18

33pF

C21

C21

OSC_EXT OSC_IN

33pF

33pF

SHDN_CHG

Q9

2STR1215Q92STR1215

SW2_PWM

12

PA4(HS)/ATPWM2

V_AIN1

VDD_LITE

33pF

33pF

J12

CON1

J12

CON1

1

J11

CON1

J11

CON1

1

J10

CON1

J10

CON1

1

J9

CON1J9CON1

1

ICCDATA_LITE

ICCCLK_LITE

RESET_LITE1BX

J8

1 2

3 4

5 6

7 8

9 10

R31

100k

R31

100k

VDD_LITE

3
2
1

J7

CON3J7CON3

ICCDATA_LITE

ICCCLK_LITE

9

10

11

PA7(HS)COMPOUT

PA6/MCO/ICCCLK/BREAK

PA5(HS)/ATPWM3/ICCDATA

8

VDD_LITE

ST2

T_AIN2

I_AIN3

R42

10k

R42

10k

R38

R38

R36

10k

R36

10k

Q7

R321k R321k

2STR1215Q72STR1215

R341kR341k

D8LED D8LED

D9

LEDD9LED

VBUS

A A

of

11Monday, January 07, 2008

11Monday, January 07, 2008

11Monday, January 07, 2008

1

IMS SYATEM LAB

USB BATTERY CHARGER

USB BATTERY CHARGER

USB BATTERY CHARGER

USB BATTERY CHARGER _V1 1

USB BATTERY CHARGER _V1 1

USB BATTERY CHARGER _V1 1

Title

Size Document Number Rev

Date: Sheet

Title

Size Document Number Rev

Date: Sheet of

Title

Size Document Number Rev

Date: Sheet of

2

CON10AJ8CON10A

3

OSC1_LITE

OSCEXT_LITE

SW2

SW2

4

RESET

RESET

12

10nF

10nF

R35

4k7

R35

4k7

C22

C22

1 2

RESET_LITE1BX

10k

10k

Q8

5

2STR1215Q82STR1215

16/21

UM0497 Schematic

6.1 USB battery charger BOM

Table 3. Bill of materials

Index Qty Reference

Value/generic part

number

Package Manufact.

Manufacturer’s

ordering code/

orderable part

number

Suppl.

Supplier‘s

ordering

code

1 2 C1,C2 47 µF/16 V

2 1 C3 4.7 µF/25 V

Electrolytic

cylindrical

Electrolytic

cylindrical

Any

Any

C4,C5,C7,

C8,C9,C1

312

0,C11,C1
3,C14,C1

100 nF 805 Any

5,C17,C2

4

4 1 C6 1 µF/16 V

5 1 C12 470 µF/16 V

64

C16,C18,

C20,C21

33 pF 805 Any

Electrolytic

cylindrical

Electrolytic

cylindrical

Any

7 2 C19,C22 10 nF 805 Any

8 1 C23 200 µF

Electrolytic

cylindrical

Any

9 2 D1,D2 1N5817 DO41 ST 1N5817

10 4

D3,D4,D8,

D9

LED Axial LED Any

11 1 D5 TL1431AIZ TO-92 ST TL1431AIZ
12 2 D6,D7 1N5819 DO41 ST 1N5819

JP1,JP3,

JP12,

13 7

JP13,
JP14,

Jumper SIP-2 Any

JP15,

JP16
14 1 J1 CON4 SIP-4 Any
15 1 J2 CON8 SIP-8 Any
16 2 J3,J4 CON12 SIP-12 Any
17 2 J5,J7 CON3 SIP-3 Any

18 2 J6,J8 CON10A

19 4

J9,J10,

J11, J12

CON1

Box

header

Mounting

holes

Any

Any

17/21

Schematic UM0497

Table 3. Bill of materials (continued)

Index Qty Reference

Value/generic part

number

Package Manufact.

Manufacturer’s

ordering code/

orderable part

number

Suppl.

Supplier‘s

ordering

code

20 1 L1 10 µH

21 1 L2 33 µH

Axial

inductor

Axial

inductor

Any

Any

22 1 M1 STT3PF30L SOT23-6L ST STT3PF30L
23 3 Q1,Q2,Q3 2STR2215 SOT-23 ST 2STR2215

Q4,Q5,Q6

24 6

,Q7,Q8,

2STR1215 SOT-24 ST 2STR1215

Q9

25 4

R2,R8,

R31,R41

100 kΩ 805 Any

26 1 R3 18 kΩ 805 Any
27 2 R4,R9 0 (optional) 805 Any
28 1 R5 200 kΩ 805 Any
29 1 R6 16 kΩ 805 Any

R7,R10,

30 8

R13,R28,
R33,R36,

10 kΩ 805 Any

R38,R42

R11,R14,

31 6

R15,R27,

1 kΩ 805 Any

R32,R34

32 1 R16 50 805 Any

33 1 R17 4k4(0.1%) 805

RS

Components

215-3112

34 1 R18 330 805 Any

35 1 R19 10 kΩ (0.1%) 805

RS

Components

215-3493

36 1 R20 100 805 Any
37 1 R21 1k5 805 Any

38 2 R22,R25 5 kΩ (0.5%) 805

RS

Components

215-3162

39 1 R23 470 805 Any
40 1 R24 82 805 Any
41 1 R26 0.5/1 W(1%) RES Axial Vishay CPF1R500000FL
42 1 R29 56 805 Any

43 4

R30,R35,

R39,R40

4k7 805 Any

18/21

UM0497 Schematic

Table 3. Bill of materials (continued)

Index Qty Reference

Value/generic part

number

Package Manufact.

44 1 R37 1M 805 Any

Manufacturer’s

ordering code/

orderable part

number

Suppl.

Supplier‘s

ordering

code

45 1 R43 POT

46 2 SW1,SW2 Reset

47 1 TP1 Test point

Top notch

3296
Push

button
Single

berg pin

Any

Any

Any

48 1 U1 ST890BDR SO-8 ST ST890BDR
49 1 U2 L6920D TSSOP8 ST L6920D
50 1 U3 STM1061N25WX6F SOT23-3 ST STM1061N25WX6F
51 1 U4 ST72F60E2M1 SO24 ST ST72F60E2M1
52 1 U5 ST7FLIT15BY0M6 SO16 ST ST7FLIT15BY0M6

53 1 Y1 16 MHz

54 1 Y2 12 MHz

Crystal

oscillator

Crystal

oscillator

Any

Any

19/21

Revision history UM0497

7 Revision history

Table 4. Document revision history

Date Revision Changes

07-Feb-2008 1 Initial release

20/21

UM0497

Please Read Carefully:

Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the
right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any
time, without notice.

All ST products are sold pursuant to ST’s terms and conditions of sale.
Purchasers are solely res ponsibl e fo r the c hoic e, se lecti on an d use o f the S T prod ucts and s ervi ces d escr ibed he rein , and ST as sumes no

liability whatsoever relati ng to the choice, selection or use of the ST products and services described herein.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this

document refers to any third pa rty p ro duc ts or se rv ices it sh all n ot be deem ed a lice ns e gr ant by ST fo r t he use of su ch thi r d party products
or services, or any intellectua l property c ontained the rein or consi dered as a warr anty coverin g the use in any manner whats oever of suc h
third party products or servi ces or any intellectual property containe d therein.

UNLESS OTHERWISE SET FORTH IN ST’S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED
WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICUL AR PURPOS E (AND THEIR EQUIVALE NTS UNDER THE LAWS
OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT.

UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZED ST REPRESENTATIVE, ST PRODUCTS ARE NOT
RECOMMENDED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAINING
APPLICATIONS, NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJ URY,
DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. ST PRODUCTS WHICH ARE NOT SPECIFIED AS "AUTOMOTIVE
GRADE" MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER’S OWN RISK.

Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void
any warranty granted by ST fo r the ST pro duct or serv ice describe d herein and shall not cr eate or exten d in any manne r whatsoever , any
liability of ST.

ST and the ST logo are trademarks or registered trademarks of ST in various countries.

Information in this document su persedes and replaces all information previously supplied.

The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners.

© 2008 STMicroelectronics - All rights reserved

STMicroelectronics group of compan ie s

Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan -

Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America

www.st.com

21/21