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ST ST7260E2, User Manual

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ST ST7260E2 User Manual Download Page 9

UM0497

Running the evaluation board

 9/21

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

.

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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