19-4633 5/09 DS2756 High-Accuracy Battery Fuel Gauge with Programmable Suspend Mode www.maxim-ic.com GENERAL DESCRIPTION FEATURES The DS2756 high-precision battery fuel gauge is a Programmable Suspend Mode data-acquisition and information-storage device Accurate Current Accumulation tailored for cost-sensitive and space-constrained 1- - 2% 4 V over 64mV Input Range cell Li+/polymer battery-pack applications. The - 2% 200 A over 3.2A with 20m Sense DS2756 provides the key hardware components Current Measurement required to accurately estimate remaining capacity by - 9-Bit Snapshot Measurement integrating low-power, precision measurements of - 12-Bit Average Updated Every 88ms temperature, voltage, current, and current - 15-Bit Average Updated Every 2.8s accumulation, as well as nonvolatile (NV) data Voltage Measurement storage, into the small footprint of a 3.0mm x 4.4mm - 9-Bit Snapshot Measurement 8-pin TSSOP package. - 10-Bit Average Updated Every 4ms Temperature Measurement Through its 1-Wire interface, the DS2756 gives the - 10-Bit with 0.125C Resolution host system read/write access to status and control Snapshot Mode Allows Instantaneous Power registers, instrumentation registers, and general- Measurement purpose data storage. Each device has a unique Host Alerted When Accumulated Current or factory-programmed 64-bit net address that allows it Temperature Exceeds Programmable Limits to be individually addressed by the host system, 96 Bytes of Lockable EEPROM supporting multibattery operation. 8 Bytes of General-Purpose SRAM Dallas 1-Wire Interface with Unique 64-Bit Address and Standard or Overdrive Timing 3mm Dimension of 8-Pin TSSOP Package Allows Mounting on Side of Thin Prismatic Li+ and Li+/Polymer Cells TYPICAL OPERATING CIRCUIT ORDERING INFORMATION PART TEMP RANGE PIN-PACKAGE DS2756E+ -20C to +70C 8 TSSOP DS2756E+ on DS2756E+T&R -20C to +70C Tape-and-Reel + Denotes lead(Pb)-free/RoHS-compliant package. PIN CONFIGURATION V DQ IN 1 81 V SNS SS 2 7 2 PIO IS2 3 6 2 V IS1 DD 4 5 1-Wire is a registered trademark of Maxim Integrated Products, Inc. DS2756E TSSOP Package Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata. 1 of 27 DS2756: High-Accuracy Battery Fuel Gauge with Programmable Suspend Mode ABSOLUTE MAXIMUM RATINGS Voltage on PIO Pin, Relative to V -0.3V to +12V SS Voltage on All Other Pins, Relative to V -0.3V to +6V SS Continuous Sink Current, DQ, PIO 12mA Operating Temperature Range -40C to +85C Storage Temperature Range -55C to +125C Soldering Temperature See J-STD-020A Specification This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. RECOMMENDED DC OPERATING CONDITIONS (3.0V V 4.5V, T = -20 C to +70 C.) DD A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage V (Note 1) +3.0 +4.5 V DD Data Pin DQ (Note 1) -0.3 +5.5 V VPin V (Note 1) -0.3 +4.5 V IN IN DC ELECTRICAL CHARACTERISTICS (3.0V V 4.5V, T = -20 C to +70 C.) DD A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DQ = V , EEC bit = 0, DD 75 100 A 3.0V < V < 4.2V Active Mode DD I ACTIVE Supply Current DQ = V EEC bit = 0 120 DD, Sleep Mode I DQ = 0V, PIE = 00b 1 3 SLEEP A Supply Current Suspend Mode DQ = 0V, PIE 00b I 1.5 4 A SUSPEND Supply Current (Note 11) Current Measurement Input V (Note 2) 64 mV IS1-IS2 Range Current Register Offset I (Note 4) 7.813 OERR V/R Error % Current Gain Error I (Notes 2, 5) GERR 1 reading 24 Hour Accumulated V = 0, OBEN set, IS1-IS2 q -200 -100 0 Vhr/R CA Current Error (Notes 2, 3, 6) Current Sampling f 1456 Hz SAMP Frequency IS1-VSS, IS2-SNS Filter R 10 KS +25C k Resistors Input Resistance: V R V = V 5 M IN IN IN DD Voltage Offset Error V (Note 7) mV OERR 5 %V Voltage Gain Error V 2 GERR reading Temperature Error T (Note 8) 3 C ERR Input Logic High: DQ, PIO V (Note 1) 1.5 V IH Input Logic Low: DQ, PIO V (Note 1) 0.4 V IL Output Logic Low: DQ, PIO V I = 4mA (Note 1) 0.4 V OL OL DQ Pulldown Current I 1 A PD DQ Capacitance C 60 pF DQ DQ Low-to-Sleep Time t 2.1 s SLEEP Suspend Period Accuracy t 0 30 % SUS ERR Minimum Active Mode t 87 90 93 ms ACT MIN 2 of 27