DS2751+ MAXIM [Maxim Integrated Products], DS2751+ Datasheet

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DS2751+

Manufacturer Part Number
DS2751+
Description
Multichemistry Fuel Garge
Manufacturer
MAXIM [Maxim Integrated Products]
Datasheet
FEATURES
§ Available in Two Configurations
§ Current Measurement
§ Current Accumulation
§ Voltage Measurement with 4.88mV
§ Temperature Measurement Using Integrated
§ 32 Bytes of Lockable EEPROM
§ 16 Bytes of General-Purpose SRAM
§ Dallas 1-Wire
§ Supports 1-Cell Li+/Polymer or 3-Cell Ni
§ 3mm Dimension of 8-Pin TSSOP Package
§ Low Power Consumption:
www.maxim-ic.com
1-Wire is a registered trademark of Dallas Semiconductor.
- Internal 25mW Sense Resistor
- External User-Selectable Sense Resistor
- 12-Bit Bidirectional Measurement
- Internal Sense Resistor Configuration:
- External Sense Resistor Configuration:
- Internal Sense Resistor: 0.25mAhr LSB
- External Sense Resistor: 6.25mVhr LSB
Resolution
Sensor with 0.125°C Resolution
Device Address
Battery Packs
Allows Mounting on Side of Thin Li+ and
Li+/Polymer Cells (Lead Free available)
- Active Current:
- Sleep Current:
0.625mA LSB and ±1.9A Dynamic Range
15.625mV LSB and ±64mV Dynamic
Range
®
Interface with Unique 64-Bit
60mA (typ), 90mA (max)
1mA (typ), 2mA (max)
1 of 19
PIN CONFIGURATION
PIN DESCRIPTION
V
V
PIO
V
IS1
IS2
SNS
DQ
IN
SS
DD
Voltage-Sense Input
Device Ground
Programmable I/O Pin
Power-Supply Input (2.5V to 5.5V)
Current-Sense Input
Current-Sense Input
Sense Resistor Connection
Data Input/Output
Multichemistry Battery
PIO
V
V
V
SS
DD
IN
8-Pin TSSOP Package
(Lead Free Available)
1
2
3
4
1
2
2
DS2751E
Fuel Gauge
8
7
6
5
DQ
SNS
IS2
IS1
DS2751
020105

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DS2751+ Summary of contents

Page 1

FEATURES § 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: ...

Page 2

ORDERING INFORMATION PART MARKING DS2751E 2751E 2751E DS2751E+ (Note 1) DS2751E-025 2751R 2751R DS2751E+025 (Note 1) DS2751E/T&R 2751E 2751E DS2751E+T&R (Note 1) DS2751E-025/T&R 2751R 2751R DS2751E+025/T&R (Note 1) Note 1: A “+” will be marked on the package near the ...

Page 3

ABSOLUTE MAXIMUM RATINGS* Voltage on PIO Pin, Relative to V Voltage on All Other Pins, Relative to V Continuous Internal Sense Resistor Current Pulsed Internal Sense Resistor Current Operating Temperature Range Storage Temperature Range Soldering Temperature * This is a ...

Page 4

ELECTRICAL CHARACTERISTICS: TEMPERATURE, VOLTAGE, CURRENT = 2.5V £ V £ 5.5V, -20°C to +70°C PARAMETER SYMBOL Temperature Resolution Temperature Full-Scale Magnitude Temperature Error Voltage Resolution Voltage Full-Scale Magnitude Voltage Offset Error Voltage Gain Error Current Resolution Current ...

Page 5

EEPROM RELIABILITY SPECIFICATION = 2.5V £ V £ 5.5V, -20°C to +70°C PARAMETER SYMBOL Copy to EEPROM Time EEPROM Copy Endurance Note 1: All voltages are referenced to V Operating V > 4.5V relative to V Note ...

Page 6

Figure 1. FUNCTIONAL DIAGRAM DQ INTERFACE ADDRESS THERMAL SENSE IS1 - IS2 SNS 1-WIRE AND VOLTAGE REFERENCE MUX ADC INTERNAL SENSE RESISTOR CONFIGURATION ONLY IS2 REGISTERS AND USER MEMORY LOCKABLE EEPROM SRAM TEMPERATURE VOLTAGE ...

Page 7

Figure 2. APPLICATION EXAMPLE PACK+ 150W DATA 5.6V 102 PACK present for external sense resistor configurations only. SENS present for internal sense resistor configurations only. SENSINT POWER MODES The DS2751 has two power modes: ...

Page 8

CURRENT MEASUREMENT In the active mode of operation, the DS2751 continually measures the current flow into and out of the battery by measuring the voltage drop across a current-sense resistor. The DS2751 is available in two configurations: 1) internal 25mW ...

Page 9

Figure 4. CURRENT ACCUMULATOR FORMAT MSB—Address MSb CURRENT OFFSET COMPENSATION Current measurement and the current accumulation are both internally compensated for offset on a continual basis minimizing error resulting from variations in ...

Page 10

TEMPERATURE MEASUREMENT The DS2751 uses an integrated temperature sensor to continually measure battery temperature. Temperature measurements are updated in the Temperature Register every 220ms in two’s-complement format with a resolution of 0.125°C over a ±127°C range. The Temperature Register format ...

Page 11

Table 3. MEMORY MAP ADDRESS (HEX) 00 Reserved 01 Status Register Reserved 07 EEPROM Register 08 Special Feature Register Reserved 0C Voltage Register MSB 0D Voltage Register LSB 0E Current Register MSB 0F Current ...

Page 12

UVEN—Undervoltage Sleep Enable. A value UVEN along with a value PMOD enables the DS2751 to enter sleep mode when the voltage (cell depletion). A value of 0 disables the DS2751 from ...

Page 13

POR—POR Indicator bit. This bit is set when the DS2751 experiences a power-on-reset (POR) event. To use the POR bit to detect a power-on-reset, the POR bit must be set the host system ...

Page 14

Figure 12. 1-WIRE CRC GENERATION BLOCK DIAGRAM MSb HARDWARE CONFIGURATION Because the 1-Wire bus has only a single line important that each device on the bus be able to drive it at the appropriate time. To facilitate this, ...

Page 15

All transactions of the 1-Wire bus begin with an initialization sequence consisting of a reset pulse transmitted by the bus master followed by a presence pulse simultaneously transmitted by the DS2751 and any other slaves on the bus. The presence ...

Page 16

Write Data [6Ch, XX]. This command writes data to the DS2751 starting at memory address XX. The LSb of the data to be stored at address XX can be written immediately after the MSb of the address has been entered. ...

Page 17

Figure 14. NET ADDRESS COMMAND FLOW CHART 33h / 39h NO READ YES DS2751 Tx FAMILY CODE 1 BYTE DS2751 Tx SERIAL NUMBER 6 BYTES DS2751 Tx CRC 1 BYTE MASTER Tx FUNCTION COMMAND MASTER Tx RESET PULSE DS2751 Tx ...

Page 18

I/O SIGNALING The 1-Wire bus requires strict signaling protocols to insure data integrity. The four protocols used by the DS2751 are: the initialization sequence (reset pulse followed by presence pulse), Write 0, Write 1, and Read Data. All of these ...

Page 19

Figure 16. 1-WIRE WRITE AND READ TIME SLOTS WRITE 0 SLOT DS2751 SAMPLE WINDOW MIN 15ms 15ms READ 0 SLOT t SLOT DQ MASTER SAMPLE WINDOW t RDV LINE TYPE LEGEND: SLOT LOW0 t REC >1ms TYP ...

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