Rainbow-electronics DS2770 Manuel d'utilisateur

1 of 27 041202FEATURES§ Integrated charge controller supporting bothrechargeable lithium and NiMH batterytechnologies§ Available in two configuratio

DS277010 of 27CURRENT REGISTER FORMAT Figure 5MSB—Address 0E LSB—Address 0FS21421321221121029282726252423222120MSb LSb MSb LSbUnits: 62.5mAh for inter

DS277011 of 27CURRENT-OFFSET BIAS Figure 7MSB—Address 32 LSB—Address 33S21421321221121029282726252423222120MSb LSb MSb LSbUnits: 0.0625mA for internal

DS277012 of 27ELAPSED TIME REGISTER FORMAT Figure 10MSB—Address 02 LSB—Address 0321521421321221121029282726252423222120MSb LSb MSb LSbUnits: 0.015625h

DS277013 of 27MEMORY MAP Figure 11ADDRESS (HEX) DESCRIPTION R/W00 Reserved01 Status Register R**02 Elapsed Time Register MSB R/W03 Elapsed Time Regist

DS277014 of 27STATUS REGISTER FORMAT Figure 12 Address 01 bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 CSTAT1 CSTAT0 PMOD RNAOP X X CINI

DS277015 of 27EEPROM REGISTERFigure 13 shows the format of the EEPROM Register. The function of each bit is described in detail inthe following paragr

DS277016 of 27NET ADDRESS FORMAT Figure 148-Bit CRC 48-Bit Serial Number 8-Bit FamilyCode (2Eh)CRC GENERATIONThe DS2770 has an 8-bit CRC stored in the

DS277017 of 271-WIRE BUS INTERFACE CIRCUITRY Figure 16TRANSACTION SEQUENCEThe protocol for accessing the DS2770 through the 1-Wire port is as follows:

DS277018 of 27Skip Net Address [CCh]. This command saves time when there is only one DS2770 on the bus byallowing the bus master to issue a Function c

DS277019 of 27Write Data [6Ch, XX]. This command writes data to the DS2770 starting at memory address XX. TheLSb of the data to be stored at address X

DS27702 of 27DESCRIPTIONThe DS2770 battery monitor and charge controller performs several functions needed for thoroughbattery maintenance. When used

DS277020 of 27ROM COMMAND FLOW CHART Figure 17YESMASTER TxRESET PULSEDS2770 TxPRESENCE PULSEMASTER TxNET ADDRESSCOMMAND55hMATCH33h or 39hREADF0hSEARCH

DS277021 of 27FUNCTION COMMANDS Table 3COMMAND DESCRIPTIONCOMMANDPROTOCOLBUS STATE AFTERCOMMANDPROTOCOLBUS DATARead DataReads data frommemory map star

DS277022 of 271-WIRE INITIALIZATION SEQUENCE (RESET PULSE AND PRESENCEPULSE) Figure 18WRITE TIME SLOTSA write time slot is initiated when the bus mast

DS277023 of 271-WIRE WRITE AND READ TIME SLOTS Figure 19VCCGNDtSLOTDQtLOW1tSLOTWRITE 0 SLOT WRITE 1 SLOTtLOW0tREC>1msDS2770 Sample Window MIN TYP M

DS277024 of 27ABSOLUTE MAXIMUM RATINGS*Voltage on VIN, Relative to Ground -0.3V to VDD + 0.3VVoltage on VCH, CC, UV -0.3V to +18VVoltage on Any Other

DS277025 of 27UV Output LowIOL,UV\VUV\ = 2V 5 10 mA 11UV Output HighVOH,UV\IUV\ = 10mAVP - 0.5V 10CC Output LowIOL,CC\VCC\ = 2V 5 10 mA 11CC Output

DS277026 of 27EEPROM RELIABILITYSPECIFICATION (-20°C to 70°C, 2.7V £ VDD £ 5.5V)PARAMETER

DS277027 of 27ELECTRICAL CHARACTERISTICS:1-WIRE INTERFACE (-20°C to 70°C, 2.7V £ VDD £ 5.5V)PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS NOTESTime Slo

DS27703 of 27BLOCK DIAGRAM Figure 11-WIREINTERFACEANDADDRESSTHERMALSENSEMUXVOLTAGEREFERENCEADCLOCKABLE EEPROMSRAMTEMPERATUREVOLTAGECURRENTACCUM CURREN

DS27704 of 27DETAILED PIN DESCRIPTION Table 1PIN SYMBOL DESCRIPTION1UVBattery Undervoltage Detect Output: This pin allows charge of thebattery at a re

DS27705 of 27APPLICATION EXAMPLE Figure 2VDDFMMT7184403UVCCVCHSNSSNSSNSIS2NCVINDQVSSVSSVSSNCIS1LithiumProtectionCircuit4.7kW 1kW1kW100W150W0.1mF0.1mF3

DS27706 of 27POWER MODESThe DS2770 has two possible power modes: Active Mode and Sleep Mode. While in Active Mode, theDS2770 continually measures curr

DS27707 of 27After initiation and clearing of the above conditions, fast charging begins with the CC pin driven low.During fast charging, CC remain

DS27708 of 27RECHARGEABLE LITHIUM PULSE CHARGING Figure 3NiMH CHARGER OPERATIONDuring NiMH charging, charge current from a constant current or current

DS27709 of 27SECONDARY CHARGE TERMINATIONTwo secondary charge terminations are included. Independent of battery technology selection, chargeterminates