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ST ST7260E2, User Manual

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ST ST7260E2 User Manual Download Page 19

UM0497

Schematic

 19/21

44

1

R37

1M

805

Any

45

1

R43

POT

Top notch 

3296

Any

46

2

SW1,SW2

Reset

Push 

button

Any

47

1

TP1

Test point

Single 

berg pin

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

Crystal 

oscillator

Any

54

1

Y2

12 MHz

Crystal 

oscillator

Any

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

Summary of Contents for ST7260E2

Page 1: ...e 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 evalua...

Page 2: ...ly 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 Io...

Page 3: ...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 Fig...

Page 4: ...ply 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 do...

Page 5: ...oltage 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 accu...

Page 6: ...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 sh...

Page 7: ...pply 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 controll...

Page 8: ...trolled 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...

Page 9: ...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...

Page 10: ...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 partic...

Page 11: ...trol different charging parameters 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...

Page 12: ...arging For example Y 18 for 45 mA short circuit current 12 LION_VHEAT_ UP Heat indicator threshold For example Z 80 for 45 Celsius degree temperature Here R1 is in k 13 LION_VHEAT_ DOWN Cold indicator...

Page 13: ...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 m...

Page 14: ...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...

Page 15: ...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 re...

Page 16: ...J6 CON10A 1 2 3 4 5 6 7 8 9 10 C5 100nF C5 100nF 1 2 R41 100k R41 100k R25 5k 0 5 R25 5k 0 5 C6 1uF 16V C6 1uF 16V R38 10k R38 10k Q8 2STR1215 Q8 2STR1215 J7 CON3 J7 CON3 1 2 3 C17 100nF C17 100nF 1...

Page 17: ...nF 805 Any 4 1 C6 1 F 16 V Electrolytic cylindrical 5 1 C12 470 F 16 V Electrolytic cylindrical Any 6 4 C16 C18 C20 C21 33 pF 805 Any 7 2 C19 C22 10 nF 805 Any 8 1 C23 200 F Electrolytic cylindrical...

Page 18: ...Any 31 6 R11 R14 R15 R27 R32 R34 1 k 805 Any 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 k 0 1 805 RS Components 215 3493 36 1 R20 100 805 Any 37...

Page 19: ...8 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 Crystal oscillator Any 54 1 Y2 12 MHz...

Page 20: ...Revision history UM0497 20 21 7 Revision history Table 4 Document revision history Date Revision Changes 07 Feb 2008 1 Initial release...

Page 21: ...NTIES OF MERCHANTABILITY FITNESS FOR A PARTICULAR PURPOSE AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION OR INFRINGEMENT OF ANY PATENT COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT UNLESS E...

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