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BC3770 Datasheet(PDF) 18 Page - Freescale Semiconductor, Inc |
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BC3770 Datasheet(HTML) 18 Page - Freescale Semiconductor, Inc |
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18 / 45 page  Analog Integrated Circuit Device Data Freescale Semiconductor 18 BC3770 Figure 6. Charger State Diagram DEVICE IN STANDBY/ SHUTDOWN MODE - VBUS < VUV LO - SUSPEND=0 -I2C not available if SHDNB=N - I2C active if SHDNB=H Q4=ON Valid VBUS attached QUALIFICATION PROCESS FOR CHARGER ENABLE - VUVLO < VBUS < VOVP - Battery Presence Detection - BATREG < BAT_OVP -Die Temp < 130C -VBUS > BATREG+150mV - CHGENB=LOW -CHGEN=1 -POK=H -VL=ON TIMER FAULT - Interrupt triggered Any Charging State - VBUS < UVLO or -VL=OFF or -CHGEN=0 or -CHGENB=HIGH TRICKLE CHARGE MODE -VSYS=3.6V - ICHG=90mA -I2C Active BAT < 2.5V 2.5V = BATREG = 3.6V PRE-CHARGE MODE -VSYS=3.6V -ICHG=150mA(Default) - I2C Active Pre-charge timer=ON Tim er-O ut& BA TR EG <3. 6V FAST-CHARGE MODE -VSYS=Track BATREG -ICHG=500mA(Default) - I2C Activee Fast-charge timer=ON if enabled BATREG > 3.6V & Soft-Start w/ 2ms TOP-OFF MODE -VSYS=BATREG+ ICHG x RDSON_Q4 -I2C Active - Top-Off timer=ON - Top-Off Interrupt triggered BATREG =VBAT_REG & ICHG=Itop-off Ti me r- Ou t& BA TR EG < VBA T_ RE G DONE MODE -VSYS=VBAT_REG - I2C Active - DONE Interrupt triggered -ICHG=0mA - Charger stopped Top-Off timer expires RECHARGE MODE -Recharge Interrupt generated AUTOSTOP=1 ? YES CV MODE -VSYS=VBAT_REG -I2C Active -DONE Interrupt triggered - Charger kept ON in CV mode NO VBAT RE G- VBA T_ RE G ? -10 0m V & tBAT _RE CH G & T op- OFF det ect ed V BAT REG-V BAT_ RE G ? -100 mV & t BAT_ REC HG & T op-O FFd etec ted V BAT REG-V BAT_ REG ? -100 mV & t BAT_ REC HG & Top- Offd etect ed Toggle CHGEN bit or toggle CHGENB pin or Re-Attach VBUS input CHARGING SUSPENDED - Interrupt triggered - Timer Reset CHARGING Resumes automatically at where the suspended occurred - VBUS > OVP or -Die Temp > 130C or - BAT OVP detected Each condition released Tim eou t an d B AT RE G < 3.6 V Tim eo ut an d B AT RE G < V BA T_ RE G VBATREG - VBAT_REG = -100 mV & tBAT_RECHG & TOP_OFF detected VBATREG - VBAT_REG = -100 mV & tBAT_RECHG & TOP_OFF detected VBATREG - VBAT_REG = -100 mV & tBAT_RECHG & TOP_OFF detected |
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