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