ds2764aet-r Maxim Integrated Products, Inc., ds2764aet-r Datasheet - Page 7

• Manufacturer Part Number: ds2764aet-r
• Description: Ds2764 High-precision Li+ Battery Monitor With 2-wire Interface
• Manufacturer: Maxim Integrated Products, Inc.

Figure 2. Block Diagram
DETAILED DESCRIPTION
The DS2764 high-precision Li+ battery monitor is a data-acquisition, information-storage, and safety-protection
device tailored for cost-sensitive battery pack applications. This low-power device integrates precise temperature,
voltage, and current measurement, nonvolatile (NV) data storage, and Li+ protection into the small footprint of
either a TSSOP package or flip-chip package. The DS2764 is a key component in applications including remaining
capacity estimation, safety monitoring, and battery-specific data storage.
Through its 2-Wire interface, the DS2764 gives the host system read/write access to status and control registers,
instrumentation registers, and general-purpose data storage. The 7-bit slave address is field programmable, thus
allowing up to 128 devices to be distinctly addressed by the host system.
The DS2764 is capable of performing temperature, voltage, and current measurement to a resolution sufficient to
support process monitoring applications such as battery charge control, remaining capacity estimation, and safety
monitoring. Temperature is measured using an on-chip sensor, eliminating the need for a separate thermistor.
Bidirectional current measurement and accumulation are accomplished using either an internal 25mW sense
resistor or an external device.
EEPROM memory is provided to save important battery data in true NV memory that is unaffected by severe
battery depletion, accidental shorts, or ESD events. 40 bytes are partitioned into two 16-byte blocks and one 8-byte
block. Each block can be individually locked or write protected to provide additional security for unchanging battery
data. The lock operation is permanent and thus converts rewritable EEPROM to read only memory. Devices
ordered with the unique 64-bit ID option do not have access to the 8 byte block, only the two 16 byte blocks of
EEPROM are available.
SDA
SNS
SCL
PLS
IS1
IS2
V
PS
IN
THERMAL
SENSE
+
-
INTERFACE
IS2
MUX
2-Wire
25mW
INTERNAL SENSE RESISTOR
CONFIGURATION ONLY
REFERENCE
VOLTAGE
ADC
IS1
DS2764
7 of 20
LOCKABLE EEPROM
STATUS/CONTROL
ACCUM. CURRENT
REGISTERS AND
Li+ PROTECTION
USER MEMORY
TEMPERATURE
CURRENT
VOLTAGE
CHIP GROUND
TIMEBASE
V
CC
DC
SS