DS2720 Datasheet | Dallas Semiconducotr

FEATURES - Rechargeable Lithium-Ion (Li+) Safety Circuit - Overvoltage Protection - Overcurrent/Short-Circuit Protection - Undervoltage Protection - Overtemperature Protection Controls High-Side N-Channel Power MOSFETs Driven from 9V Charge Pump System Power Management and Control Feature Support Eight Bytes of Lockable EEPROM Dallas 1-Wire® Interface with Unique 64-Bit Device Address 8-Pin m SOP Package Low Power Consumption: - Active Current: 12.5m A typ - Sleep Current: 1.5m A typ PIN CONFIGURATION PLS PS DQ VSS 1 2 3 4 8 7 6 5 CP DC CC VDD - - - - - - DS2720U m SOP PIN DESCRIPTION PLS PS DQ VSS VDD CP CC DC Battery-Pack Positive Terminal Input Power-Switch Sense Input Data Input/Output Device Ground Power-Supply Input Reservoir Capacitor Charge Control Output Discharge Control Output DESCRIPTION The DS2720 single-cell rechargeable Li+ protection IC provides electronic safety functions required for rechargeable Li+ applications including protecting the battery during charge, protection of the circuit from damage during periods of excess current flow and maximization of battery life by limiting the level of cell depletion. Protection is facilitated by electronically disconnecting the charge and discharge conduction path with switching devices such as low-cost N-channel power MOSFETs. Since the DS2720 provides high-side drive to external N-channel protection MOSFETs from a 9V charge pump, superior on-resistance performance results pared to mon low-side protector circuits using the same FETs. The FET on-resistance actually decreases as the battery discharges. Adding to the uniqueness of the DS2720 is the ability of the system to control the FETs from either the data interface or a dedicated input thereby eliminating the power-switch control redundancy of rechargeable Li+ battery systems. Through its 1-Wire interface, the DS2720 gives the host system read/write access to status and control registers, instrumentation registers, and general-purpose data storage. Each...