DS2770 查看數據表（PDF） - Maxim Integrated
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DS2770 Datasheet PDF : 27 Pages
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ORDERING INFORMATION
ORDERING NUMBER MARKING
DS2770AE+
D2770EA
DS2770BE+
D2770EB
DS2770AE+T&R
D2770EA
DS2770BE+T&R
D2770EB
DS2770AE+025
2770EAR
DS2770BE+025
2770EBR
DS2770AE+025/T&R
2770EAR
DS2770BE+025/T&R
2770EBR
DS2770AE
D2770EA
DS2770BE
D2770EB
DS2770AE/T&R
D2770EA
DS2770BE/T&R
D2770EB
DS2770AE-025
2770EAR
DS2770BE-025
2770EBR
DS2770AE-025/T&R
2770EAR
DS2770BE-025/T&R
2770EBR
DS2770
DESCRIPTION
TSSOP, Ext. Sense Res., 4.1V Charge Voltage, Lead-Free
TSSOP, Ext. Sense Res., 4.2V Charge Voltage, Lead-Free
DS2770AE+ on Tape and Reel, Lead-Free
DS2770BE+ on Tape and Reel, Lead-Free
TSSOP, 25mΩ Sense Res., 4.1V Charge Voltage, Lead-Free
TSSOP, 25mΩ Sense Res., 4.2V Charge Voltage, Lead-Free
DS2770AE+025 on Tape and Reel, Lead-Free
DS2770BE+025 on Tape and Reel, Lead-Free
TSSOP, Ext. Sense Res., 4.1V Charge Voltage
TSSOP, Ext. Sense Res., 4.2V Charge Voltage
DS2770AE on Tape and Reel
DS2770BE on Tape and Reel
TSSOP, 25mΩ Sense Res., 4.1V Charge Voltage
TSSOP, 25mΩ Sense Res., 4.2V Charge Voltage
DS2770AE-025 on Tape and Reel
DS2770BE-025 on Tape and Reel
DESCRIPTION (CONTD.)
The DS2770 provides a unique ID, a digital temperature sensor, an analog-to-digital converter (ADC) that
measures battery voltage and current, an integrated current accumulator that keeps a running total of all
current entering and leaving the battery, an elapsed time meter, NV memory for storage of important
parameters, and an integrated charge controller supporting rechargeable lithium (including lithium-ion
and lithium-ion polymer) and nickel metal hydride (NiMH) batteries. Current measurement can be
accomplished through the use of an integrated 25mW sense resistor or through an external sense resistor.
The resolution of the current, voltage, and temperature measurements is sufficient for process monitoring
applications such as battery-charge control and safety. The charge-control technique is user-selectable to
support either pulse charge for rechargeable lithium or dT/dt termination for NiMH. Additionally,
programmable charge timers and low-battery recovery are provided for safety and convenience.
Information is sent to/from the DS2770 over a 1-Wire interface so that only one wire (and ground) needs
to be connected from a processor to a DS2770. This means that DS2770-equipped battery packs need
only four output connectors: battery power, charge source, ground, and the 1-Wire interface. Each device
has a factory-programmed 64-bit net address that allows it to be individually addressed by the host
system.
Two types of memory are provided on the DS2770 for battery information storage: lockable EEPROM
and SRAM. EEPROM memory saves important battery data in true NV memory that is unaffected by
severe battery depletion, accidental shorts, or ESD events and becomes ROM when locked to provide
additional security for unchanging battery data. SRAM provides inexpensive storage for temporary data.
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