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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Battery Management

Analog Devices Inc./Maxim Integrated DS2788E+T&R

Name: DS2788E+T&R
Brand: Analog Devices Inc./Maxim Integrated
SKU: DS2788E+T&R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DS2788E+T&R

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Battery Management

Package:: 14-TSSOP (0.173", 4.40mm Width)

Datasheet:: DS2788E+T&R.pdf

Description:: IC BATT MON LI-ION 1CELL 14TSSOP

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Product details

Overview

DS2788E+T&R from Maxim Integrated is a standalone fuel-gauge IC for single-cell Li+ and Li-polymer batteries, measuring voltage (0–4.5V, ±50mV error), temperature (±3°C), and current (±51.2mV full-scale, 1.56μV/RSNS resolution), and estimating remaining capacity in mAh and % with FuelPack™ algorithm. It integrates five 30mA open-drain LED drivers and a 1-Wire interface for battery pack monitoring in power tools and e-bikes.

For engineers reviewing the DS2788E+T&R datasheet, DS2788E+T&R pinout, DS2788E+T&R application, or DS2788E+T&R equivalent, key selection considerations include its integrated LED display drivers, 14-pin TSSOP package, nonvolatile EEPROM storage for cell parameters, 2.5–4.5V supply range, and SLEEP mode current of 1–3μA for low-power battery management.

Technical Context

The DS2788E+T&R implements a hardware-based FuelPack™ capacity estimation engine using real-time coulomb counting, temperature-compensated current sensing, and piecewise-linear cell modeling across five temperature segments. Its ADC architecture supports differential current measurement at 18.6kHz sampling, with automatic offset correction every ~1 hour and programmable gain (RSGAIN) and temperature coefficient (RSTC) registers for sense-resistor calibration.

It features dual power modes-ACTIVE (105μA typical) and SLEEP (1–3μA)-triggered via DQ line timeout or VIN undervoltage detection (2.45V threshold). Communication occurs over a multidrop-capable 1-Wire interface supporting both standard (16kbps) and overdrive (140kbps) speeds, with factory-programmed 64-bit unique ID for traceability.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	+2.5V to +4.5V - powers directly from Li+ cell without external regulator
Voltage Measurement	0–4.5V full-scale, 4.88mV LSB, ±50mV error - supports single-cell and multicell via external divider
Temperature Sensing	±3°C accuracy, 0.125°C resolution - on-chip sensor enables thermal compensation of current-sense resistor
Current Sensing	±51.2mV full-scale, 1.56μV/RSNS LSB, ±1% gain error - supports 5–20mΩ sense resistors with factory- and user-calibration
LED Drivers	Five 30mA open-drain outputs - drive LEDs directly with only series resistors; no external transistors required
1-Wire Interface	Standard (16kbps) and overdrive (140kbps) modes, multidrop capable - enables daisy-chained battery packs with single-wire communication
EEPROM	24-byte battery/application parameter + 16-byte user memory - stores calibration data, age estimation, and usage statistics with 10-year retention at +50°C

Pinout & Package

DS2788E+T&R is housed in a 14-pin thin shrink small-outline package (TSSOP), RoHS-compliant and lead-free, with 0.65mm pitch and exposed pad for thermal performance. Pin functions are validated per Maxim's official DS2788 datasheet Rev 2 (5/09).

Pin/Terminal	Circuit Role	Design Meaning
LED1–LED5	Open-drain LED driver outputs	Sink up to 30mA each; connect to LED anodes with cathodes tied to VDD - eliminates need for external drivers
DVSS	Display ground reference	Separate ground return for LED drivers to prevent noise coupling into sensitive analog measurement paths
VDD	Main power supply input	Accepts 2.5–4.5V directly from battery; requires local decoupling for stable operation during active measurements
OVD	1-Wire speed select input	Logic high enables overdrive mode (140kbps); logic low selects standard timing (16kbps) - must be consistent across all devices on multidrop bus
VSS	Analog/digital ground	Connect directly to battery negative terminal; serves as reference for SNS, VIN, and internal ADCs
DQ	1-Wire bidirectional data line	Open-drain I/O with weak internal pulldown; detects pack disconnection and initiates communication reset
VMA	Voltage measurement enable output	Drives high 13.3–14.2ms before conversion to activate external voltage-divider switch - reduces quiescent current in idle state
SNS	Current-sense resistor return	High-impedance differential input referenced to VSS; measures voltage drop across external sense resistor (RSNS)
VIN	Battery voltage sense input	High-input-impedance (15MΩ) node for direct or divided battery voltage monitoring - supports multicell via precision resistor network
PIO	Programmable I/O with debounce	Configurable as input (rising-edge triggered display enable) or open-drain output; includes 100–130ms hardware debounce for mechanical switch interfacing

Key Features

Feature	Design Value
FuelPack™ capacity algorithm	Estimates remaining mAh and % using temperature-, rate-, and aging-compensated lookup tables - eliminates host-side fuel-gauging firmware development
Integrated LED display drivers	Five 30mA open-drain outputs reduce BOM count and PCB area - enables simple 5-segment fuel gauge with only current-limiting resistors
Automatic ACR backup	Accumulated current register (ACR) is automatically saved to NV EEPROM on power-down - preserves charge/discharge history across battery removal
Programmable current calibration	RSGAIN (11-bit) and RSTC (8-bit) registers allow post-manufacture tuning of gain and temperature coefficient - supports low-cost, wide-tolerance sense resistors
Low-power SLEEP modes	Two entry conditions (DQ timeout or VIN undervoltage) with <3μA quiescent current - extends shelf life and minimizes self-discharge impact during storage

Applications

Power Tools	Electric Bicycles
Use Scenario: Cordless drill/driver battery packs require real-time state-of-charge feedback under high-current, thermally variable loads. IC Role / Device Role / Timing Role: DS2788E+T&R acts as autonomous fuel gauge, performing voltage/current/temperature acquisition, coulomb counting, and FuelPack™ capacity estimation every 440ms/3.5s respectively. Use Value: Five LED drivers provide immediate visual SOC indication without MCU intervention; SLEEP mode reduces standby drain to ≤3μA during tool idle periods.	Use Scenario: E-bike battery modules must report accurate remaining range while enduring vibration, wide temperature swings, and intermittent high-current bursts. IC Role / Device Role / Timing Role: DS2788E+T&R serves as primary battery monitor, using on-chip temperature compensation and programmable breakpoints to maintain SOC accuracy across -25°C to +70°C operating range. Use Value: 24-byte EEPROM stores cell-specific parameters (e.g., full/empty curves, RSTC), enabling precise capacity estimation even with aging or batch-variance Li-ion cells.
Uninterruptible Power Supply	Digital Cameras
Use Scenario: Small-format UPS units need reliable low-voltage warning and graceful shutdown before deep discharge damages sealed Li-ion backup cells. IC Role / Device Role / Timing Role: DS2788E+T&R monitors VIN continuously and triggers UVEN SLEEP when voltage drops below 2.45V - halting current accumulation and minimizing load during critical low-SOC states. Use Value: Accurate low-battery warning (via LED blink or 1-Wire alert) prevents unexpected shutdown; automatic ACR backup ensures charge history survives AC power loss.	Use Scenario: High-end digital cameras demand precise battery life prediction during burst-mode shooting and video recording with variable current draw. IC Role / Device Role / Timing Role: DS2788E+T&R functions as embedded fuel gauge, updating average current (IAVG) every 28s and applying rate-dependent capacity derating via FuelPack™ model. Use Value: Relative capacity (% full) output adapts dynamically to discharge rate - improves runtime estimate accuracy by >15% versus fixed-capacity models under mixed-load conditions.

Power Tools

Electric Bicycles

Use Scenario: Cordless drill/driver battery packs require real-time state-of-charge feedback under high-current, thermally variable loads.

IC Role / Device Role / Timing Role: DS2788E+T&R acts as autonomous fuel gauge, performing voltage/current/temperature acquisition, coulomb counting, and FuelPack™ capacity estimation every 440ms/3.5s respectively.

Use Value: Five LED drivers provide immediate visual SOC indication without MCU intervention; SLEEP mode reduces standby drain to ≤3μA during tool idle periods.

Use Scenario: E-bike battery modules must report accurate remaining range while enduring vibration, wide temperature swings, and intermittent high-current bursts.

IC Role / Device Role / Timing Role: DS2788E+T&R serves as primary battery monitor, using on-chip temperature compensation and programmable breakpoints to maintain SOC accuracy across -25°C to +70°C operating range.

Use Value: 24-byte EEPROM stores cell-specific parameters (e.g., full/empty curves, RSTC), enabling precise capacity estimation even with aging or batch-variance Li-ion cells.

Uninterruptible Power Supply

Digital Cameras

Use Scenario: Small-format UPS units need reliable low-voltage warning and graceful shutdown before deep discharge damages sealed Li-ion backup cells.

IC Role / Device Role / Timing Role: DS2788E+T&R monitors VIN continuously and triggers UVEN SLEEP when voltage drops below 2.45V - halting current accumulation and minimizing load during critical low-SOC states.

Use Value: Accurate low-battery warning (via LED blink or 1-Wire alert) prevents unexpected shutdown; automatic ACR backup ensures charge history survives AC power loss.

Use Scenario: High-end digital cameras demand precise battery life prediction during burst-mode shooting and video recording with variable current draw.

IC Role / Device Role / Timing Role: DS2788E+T&R functions as embedded fuel gauge, updating average current (IAVG) every 28s and applying rate-dependent capacity derating via FuelPack™ model.

Use Value: Relative capacity (% full) output adapts dynamically to discharge rate - improves runtime estimate accuracy by >15% versus fixed-capacity models under mixed-load conditions.

Equivalent & Alternatives

The following parts are listed as comparable options for similar fuel-gauge applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BQ27426YZFT	TI device uses I²C interface, lacks integrated LED drivers, supports gauging for 1–4 series cells; higher ACTIVE current (120μA)	Requires external MCU for display control and communication; better suited for multi-cell packs with host processor present	Select BQ27426YZFT when I²C integration and multi-cell support outweigh need for autonomous LED display and ultra-low SLEEP current
MAX17048G+T	Maxim device offers ModelGauge™ m3 algorithm, I²C interface, no LED drivers; 12-pin WLP package; 20μA ACTIVE current	Targets space-constrained portable devices; relies on host for display rendering and parameter updates	Choose MAX17048G+T for compact footprint and advanced impedance-track algorithm where LED display autonomy is not required

Compared with DS2788E+T&R, BQ27426YZFT and MAX17048G+T lack integrated LED drivers and use I²C instead of 1-Wire - increasing system component count and requiring host MCU involvement for basic fuel-gauge output, whereas DS2788E+T&R delivers self-contained, display-ready capacity reporting with minimal external components.

Availability

DS2788E+T&R is available at Aetrix Electronics and suitable for power tools, electric bicycles, and uninterruptible power supply systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for DS2788E+T&R includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power-management ICs for industrial, automotive, and computing applications.

The DS2788E+T&R belongs to Maxim's battery fuel-gauge product line, engineered specifically for cost-sensitive, MCU-less battery packs needing autonomous state-of-charge reporting, LED visualization, and robust nonvolatile parameter storage.

FAQ

What is the primary function of the DS2788E+T&R in a battery pack?

The DS2788E+T&R serves as a standalone fuel-gauge IC that autonomously measures battery voltage, temperature, and current; estimates remaining capacity in mAh and percentage; and drives up to five LEDs for visual state-of-charge indication. It eliminates the need for host MCU-based gauging algorithms by embedding the FuelPack™ capacity estimation engine and storing cell parameters in on-chip EEPROM. The DS2788E+T&R operates independently from system-level controllers and communicates via 1-Wire interface.

Does the DS2788E+T&R support multicell lithium-ion battery configurations?

Yes, the DS2788E+T&R supports multicell configurations through its high-input-impedance (15MΩ) VIN pin, which accepts voltage from an external resistor divider. The device measures the divided voltage and scales it internally using stored cell-count and divider-ratio parameters. Figure 2 in the official datasheet shows a verified 10-cell Li+ application using a precision trim resistor network. Calibration registers (e.g., RSGAIN, TBP12/TBP23) allow fine-tuning for multicell accuracy.

How does the DS2788E+T&R achieve accurate current measurement with low-cost sense resistors?

The DS2788E+T&R achieves accuracy with low-cost sense resistors via two programmable calibration registers: RSGAIN (11-bit, factory-set but user-reprogrammable) adjusts current-measurement gain in 0.001 steps from 0 to 1.999, compensating for resistor tolerance; and RSTC (8-bit) applies temperature compensation up to +7782ppm/°C in 30.5ppm/°C steps. These registers are stored in nonvolatile EEPROM and applied in real time during current accumulation - enabling ±1% gain error and effective thermal drift correction without precision resistors.

What power-saving features does the DS2788E+T&R offer for battery-powered systems?

The DS2788E+T&R offers two configurable SLEEP modes: PMOD SLEEP (entered after 2s of low DQ) and UVEN SLEEP (triggered when VIN falls below 2.45V). Both reduce current consumption from 105μA (ACTIVE) to 1–3μA while preserving register contents. During SLEEP, measurement and accumulation halt, but the device remains responsive to 1-Wire reset pulses. The VMA pin further conserves power by enabling external voltage-divider circuitry only during conversions - minimizing continuous loading on the battery.

Can the DS2788E+T&R be used without a microcontroller in the battery pack?

Yes, the DS2788E+T&R is explicitly designed for MCU-less operation. Its five integrated LED drivers provide direct visual fuel-gauge output; the debounced PIO pin enables display activation via mechanical switch; and the FuelPack™ algorithm runs entirely on-chip. Host interaction is optional - used only for advanced configuration (e.g., EEPROM writes, calibration) via 1-Wire. For basic SOC indication, the DS2788E+T&R functions fully autonomously with no external processor required.

DS2788E+T&R Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: -

Package/Case:: 14-TSSOP (0.173", 4.40mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Function:: Battery Monitor

Battery Chemistry:: Lithium Ion/Polymer

Number of Cells:: 1

Fault Protection:: -

Interface:: 1-Wire

Operating Temperature:: -20°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-TSSOP

DS2788E+T&R FAQ

1.How can I place an order for DS2788E+T&R through Aetrix?

Please submit a Request for Quotation (RFQ) for DS2788E+T&R on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for DS2788E+T&R reliable?

The price and inventory of DS2788E+T&R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS2788E+T&R is usually 5 days.

3.What payment methods are accepted for DS2788E+T&R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS2788E+T&R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DS2788E+T&R?

DS2788E+T&R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DS2788E+T&R order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for DS2788E+T&R?

For technical support, including DS2788E+T&R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS2788E+T&R requirements.

6.How does Aetrix verify that DS2788E+T&R is sourced from the original manufacturer or authorized distributors?

All DS2788E+T&R products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that DS2788E+T&R meets industry standards.

7.What is the process for return or replacement of DS2788E+T&R?

All DS2788E+T&R units undergo pre-shipment inspection (PSI). If there is an issue with DS2788E+T&R, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The DS2788E+T&R part is unused and in its original packaging.

Return procedure for DS2788E+T&R:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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