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DS2764 Schematic ( PDF Datasheet ) - Maxim Integrated Products

Teilenummer DS2764
Beschreibung High-Precision Li+ Battery Monitor
Hersteller Maxim Integrated Products
Logo Maxim Integrated Products Logo 




Gesamt 20 Seiten
DS2764 Datasheet, Funktion
www.maxim-ic.com
GENERAL 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 requiring remaining
capacity estimation, safety monitoring, and battery-
specific data storage.
PIN CONFIGURATIONS
TOP VIEW
CC
PLS
DC
SNS
SNS
SNS
PS
IS2
1 16
2 15
23 14
4 13
5 12
6 11
7 10
89
TSSOP
VIN
VDD
SCL
VSS
VSS
VSS
SDA
IS1
12
34
PLS DC
SNS
A
B
PS
CC
SNS
PROBE
VIN VSS
PROBE
VDD SCL
VSS
C
IS2
D
IS1
E
SDA F
FLIP CHIP
(TOP VIEW¾BUMPS ON BOTTOM)
www.DataSheet4U.com
DS2764
High-Precision Li+ Battery Monitor
with 2-Wire Interface
FEATURES
§ Li+ Safety Circuit
Overvoltage Protection
Overcurrent/Short-Circuit Protection
Undervoltage Protection
§ 0V Battery Recovery Charge
§ Available in Two Configurations:
Internal 25mW Sense Resistor
External User-Selectable Sense Resistor
§ Current Measurement
12-Bit Bidirectional Measurement
Internal Sense Resistor Configuration:
0.625mA LSB and ±1.9A Dynamic Range
External Sense Resistor Configuration:
15.625mV LSB and ±64mV Dynamic Range
§ Current Accumulation:
Internal Sense Resistor: 0.25mAhr LSB
External Sense Resistor: 6.25mVhr LSB
§ Voltage Measurement with 4.88mV Resolution
§ Temperature Measurement Using Integrated
Sensor with 0.125°C Resolution
§ 40 Bytes of Lockable EEPROM
§ Option for Unique 64-bit ID
§ Industry 2-Wire Interface with Programmable
Slave Address
§ Low-Power Consumption:
Active Current: 60mA typ, 90mA max
Sleep Current: 1mA typ, 2mA max
APPLICATIONS
PDAs
Cell Phones/Smartphones
Digital Cameras
ORDERING INFORMATION
PART
TEMP RANGE PIN-PACKAGE
DS2764BE
-20°C to +70°C 16 TSSOP
Selector Guide appears at end of data sheet, for additional
options.
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.
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011005






DS2764 Datasheet, Funktion
PIN DESCRIPTION
PIN
TSSOP
FLIP
CHIP
SYMBOL
1 C1 CC
2 B1 PLS
3 B2 DC
4, 5, 6 A3 SNS
7 B4 PS
DS2764 High-Precision Li+ Battery Monitor With w2w-Ww.iDreataISnhteeetr4fUa.ccoem
FUNCTION
Charge Protection Control Output. Controls an external P-channel high-side charge
protection FET.
Battery Pack Positive Terminal Input. The DS2764 monitors the pack plus terminal
through PLS to detect overload and short circuit removal, as well as the presence or
removal of a charge source. Additionally, a charge path to recover a deeply depleted cell
is provided from PLS to VDD. In sleep mode, any capacitance or voltage source
connected to PLS is discharged internally to VSS through 200µA (nominal) to assure
reliable detection of a valid charge source. For details of other internal connections to
PLS and associated conditions see the Li+ Protection Circuitry section.
Discharge Protection Control Output. Controls an external P-channel high-side
discharge protection FET.
Sense Resistor Connection. Connect to the negative terminal of the battery pack. In
the internal sense resistor configuration, the sense resistor is connected between VSS
and SNS.
Power Switch Sense Input. The device wakes up from sleep mode when it senses the
closure of a switch to VSS on this pin. Pin has an internal 1mA pull-up to VDD.
8 C4 IS2 Current-Sense Input. This pin is internally connected to SNS through a 4.7kW resistor.
9 D4
10 E4
11, 12, 13
14
15
16
F3
E2
E1
D1
C2
D2
IS1
SDA
VSS
SCL
VDD
VIN
SNS
Probe
VSS
Probe
Current-Sense Input. This pin is internally connected to VSS through a 4.7kW resistor.
Connect a 0.1mF capacitor between IS1 and IS2 to complete a low pass input filter.
Serial Data Input/Out. 2-Wire data line. Open-drain output driver. Connect this pin to
the DATA terminal of the battery pack. Pin has an internal 1mA pulldown for sensing
disconnection.
Device Ground. Connect directly to the negative terminal of the Li+ cell. For the external
sense resistor configuration, connect the sense resistor between VSS and SNS.
Serial Clock Input. 2-Wire clock line. Input only. Connect this pin to the CLOCK
terminal of the battery pack. Pin has an internal 1mA pulldown for sensing disconnection.
Power-Supply Input. Connect to the positive terminal of the Li+ cell through a
decoupling network.
Voltage Sense Input. The voltage of the Li+ cell is monitored through this input pin. This
pin has a weak pull-up to VDD.
Do not connect.
Do not connect.
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DS2764 pdf, datenblatt
DS2764 High-Precision Li+ Battery Monitor With w2w-Ww.iDreataISnhteeetr4fUa.ccoem
CURRENT OFFSET COMPENSATION
The current measurement and current accumulation are internally compensated for offset on a continual basis
minimizing error resulting from variations in device temperature and voltage. Additionally, the Current Offset Bias
register is a user programmable constant bias that can be used to alter the offset of the Current and Accumulated
current registers. User programmed bias values can be used to correct for offset errors after final assembly of the
module or pack. An offset value can be purposely chosen to bias current accumulation in the discharge polarity to
ensure a pessimistic accounting of mA level standby currents.
The Current Offset Bias value resides in EEPROM address 33h in two’s-complement format and is subtracted from
current measurements during the accumulation process. The Current Offset Bias is applied to the internal and
external sense resistor configurations. The factory default for EEPROM address 33h is 0.
Figure 7. Current Offset Bias
Address 33
S 26
MSb
25 24 23 22 21 20
LSb
Units: 0.625mA for Internal Sense Resistor
15.625mV for External Sense Resistor
VOLTAGE MEASUREMENT
The DS2764 continually measures the voltage between pins VIN and VSS over a 0 to 4.75V range. The voltage
register is updated in two’s-complement format every 3.4ms with a 4.88mV resolution. Voltages above the
maximum register value are reported as the maximum value. Figure 8 shows the voltage register format.
Figure 8. Voltage Register Format
S 29
MSb
MSB—Address 0C
28 27 26 25
24 23
LSb
LSB—Address 0D
22 21 20 X X X X X
MSb
LSb
Units: 4.88mV
TEMPERATURE MEASUREMENT
The DS2764 uses an integrated temperature sensor to continually measure battery temperature. Temperature
measurements are placed in the temperature register every 220ms in two’s-complement format with a 0.125°C
resolution over a ±127°C range. Figure 9 shows the temperature register format.
Figure 9. Temperature Register Format
MSB—Address 18
S 29 28 27 26 25 24 23
MSb
LSb
LSB—Address 19
22 21 20 X X X X X
MSb
LSb
Units: 0.125°C
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