Rainbow-electronics DS2761 Manual de usuario

1 of 24 071902FEATURES§ Lithium-Ion (Li+) Safety Circuit- Overvoltage Protection- Overcurrent/Short-Circuit Protection- Undervoltage Protection§

DS276110 of 24Figure 7. VOLTAGE REGISTER FORMATMSB—Address 0C LSB—Address 0DS29282726252423222120XXXXXMSb LSb MSb LSbUnits: 4.88mVTEMPERATURE MEASUREM

DS276111 of 24MEMORYThe DS2761 has a 256-byte linear address space with registers for instrumentation, status, and control inthe lower 32 bytes, with

DS276112 of 24PROTECTION REGISTERThe protection register consists of flags that indicate protection circuit status and switches that giveconditional c

DS276113 of 24Figure 10. STATUS REGISTER FORMAT Address 01 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 X X PMOD RNAOP SWEN X X XPMOD—Sle

DS276114 of 24SPECIAL FEATURE REGISTERThe format of the special feature register is shown in Figure 12. The function of each bit is described indetail

DS276115 of 24a command sequence from proceeding as a result of a CRC mismatch. Proper use of the CRC can resultin a communication channel with a very

DS276116 of 24TRANSACTION SEQUENCEThe protocol for accessing the DS2761 through the 1-Wire port is as follows:§ Initialization§ Net Address Command§

DS276117 of 24battery pack using control pins DC and CC . The SWAP command is issued followed by the net address.The effect is to cause the address

DS276118 of 24Table 4. FUNCTION COMMANDSCOMMAND DESCRIPTIONCOMMANDPROTOCOLBUS STATE AFTERCOMMANDPROTOCOLBUS DATARead DataReads data frommemory startin

DS276119 of 24Figure 16. NET ADDRESS COMMAND FLOW CHARTMASTER TxRESET PULSEDS2761 TxPRESENCE PULSEMASTER TxNET ADDRESSCOMMAND55hMATCH33h / 39hREADF0hS

DS27612 of 24ORDERING INFORMATIONPART MARKING DESCRIPTIONDS2761AE D2761EA TSSOP, External Sense Resistor, 4.275V VOVDS2761BE D2761EB TSSOP, External S

DS276120 of 24I/O SIGNALINGThe 1-Wire bus requires strict signaling protocols to insure data integrity. The four protocols used by theDS2761 are as fo

DS276121 of 24Figure 18. 1-WIRE WRITE- AND READ-TIME SLOTSFigure 19. SWAP COMMAND TIMINGPACK+PACK-tSLOTDQtLOW1tSLOTWRITE 0 SLOT WRITE 1 SLOTtLOW0tREC&

DS276122 of 24ABSOLUTE MAXIMUM RATINGS*Voltage on PLS and CC Pin, Relative to VSS-0.3V to +18VVoltage on PIO Pin, Relative to VSS-0.3V to +12VVoltag

DS276123 of 24ELECTRICAL CHARACTERISTICS:PROTECTION CIRCUITRY (0°C to +50°C, 2.5V £ VDD £ 5.5V)PARAMETER SYMBOL MIN TYP MAX UNITS NOTESOvervoltage Det

DS276124 of 24ELECTRICAL CHARACTERISTICS:1-WIRE INTERFACE (-20°C to +70°C, 2.5V £ VDD £ 5.5V)PARAMETER SYMBOL MIN TYP MAX UNITS NOTESTime Slot tSLOT60

DS27613 of 24Figure 1. BLOCK DIAGRAM1-WIREINTERFACEANDADDRESSTHERMALSENSEMUXVOLTAGEREFERENCEADCREGISTERS ANDUSER MEMORY25mWDQCHIP GROUND+-LOCKABLE EEP

DS27614 of 24Table 1. DETAILED PIN DESCRIPTIONSYMBOL DESCRIPTIONCCCharge Protection Control Output. Controls an external P-channel high-side chargepro

DS27615 of 24Figure 2. APPLICATION EXAMPLE1) RSNS is present for external sense resistor configurations only.2) RSNS-INT is present for internal sense

DS27616 of 24POWER MODESThe DS2761 has two power modes: active and sleep. While in active mode, the DS2761 continuallymeasures current, voltage, and t

DS27617 of 24charge FET back on (unless another protection condition prevents it). Discharging remains enabledduring overvoltage, and the DS2761 re-en

DS27618 of 24Summary. All of the protection conditions described above are OR'ed together to affect the CC and DCoutputs.DC = (Undervoltage) or (

DS27619 of 24When the internal sense resistor is used, the DS2761 maintains the current accumulator in units of amp-hours, with a resolution of 0.25mA