DS2780 Maxim Integrated Products, DS2780 Datasheet - Page 5

• Manufacturer Part Number: DS2780
• Description: Stand-Alone Fuel Gauge IC
• Manufacturer: Maxim Integrated Products

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DS2780 Stand-Alone Fuel Gauge IC
Figure 1. Block Diagram
VDD
EN
V
POR
BIAS/VREF
Timebase
PIO
VIN
Temp
DQ
Status
&
1-Wire
&
Voltage
OVD
Interface
Control
ADC
Rate,
EEPROM
Accumulated
Temperature
Current
Compensation
Current ADC
SNS
VSS
15 bit + sign
DETAILED DESCRIPTION
The DS2780 operates directly from 2.5V to 5.5V and supports single cell Lithium-ion battery packs. As shown in
Figure 2, the DS2780 accommodates multicell applications by adding a voltage regulator for VDD and voltage
divider for VIN. Nonvolatile storage is provided for cell compensation and application parameters. Host side
development of fuel-gauging algorithms is eliminated. On-chip algorithms and convenient status reporting of
operating conditions reduce the serial polling required of the host processor.
Additionally, 16 bytes of EEPROM memory are made available for the exclusive use of the host system and/or
pack manufacturer. The additional EEPROM memory can be used to facilitate battery lot and date tracking and
non-volatile storage of system or battery usage statistics.
A Dallas 1-Wire interface provides serial communication at the standard 16kbps or overdrive 140kbps speeds
allows access to data registers, control registers and user memory. A unique, factory programmed 64-bit
registration number (8-bit family code + 48-bit serial number + 8-bit CRC) assures that no two parts are alike and
enables absolute traceability. The Dallas 1-Wire interface on the DS2780 supports multidrop capability so that
multiple slave devices may be addressed with a single pin.
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