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Analog Devices Inc./Maxim Integrated DS2786G-C29+
- Part No.:
- DS2786G-C29+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Battery Management
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
DS2786G-C29+.pdf
- Description:
- IC BATT MONITOR LI-ION 10TDFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
DS2786G-C29+ from Maxim Integrated is a standalone OCV-based fuel gauge IC for Li-Ion/Li-Polymer battery capacity estimation. It combines open-circuit voltage (OCV) lookup with coulomb counting, delivers 12-bit voltage (±10 mV accuracy), 11-bit bidirectional current (±3.4 A range with 15 mΩ sense resistor), and on-die temperature sensing (±3°C). It operates in host-side portable devices like 3G handsets and digital cameras.
For engineers reviewing the DS2786G-C29+ datasheet, DS2786G-C29+ pinout, DS2786G-C29+ application, or DS2786G-C29+ equivalent, key selection criteria include I²C interface compatibility, 10-pin TDFN-EP package constraints, OCV model programmability, coulomb counter resolution (25 µV/RSNS), and low-power sleep mode (1 µA typical).
Technical Context
The DS2786G-C29+ implements a hybrid state-of-charge algorithm: during system inactivity, it triggers dV/dt evaluation every 15 minutes to detect relaxed OCV conditions and correct coulomb count using a 9-point piecewise-linear EEPROM-stored cell model; during active discharge/charge, it performs continuous sigma-delta ADC sampling of VIN, SNS–VSS, AIN0, AIN1, and on-die temperature at fixed intervals (880 ms or 1760 ms per channel).
Its measurement architecture includes ratiometric auxiliary inputs driven by VOUT (eliminating supply dependency), programmable current offset bias (COBR, ±3.2 mV/RSNS), and dual power modes-Active (50 µA typ) and Sleep (1 µA typ)-with automatic transition triggered by I²C bus activity or timeout (1.5–2.2 s bus-low detection).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Measurement | 12-bit resolution (1.22 mV LSB), 0–4.5 V input range, ±10 mV absolute accuracy - enables precise single-cell or averaged multi-cell pack voltage monitoring. |
| Current Measurement | 11-bit bidirectional, ±51.2 mV full-scale, 25 µV LSB - supports ±3.4 A range with 15 mΩ sense resistor and accurate charge/discharge tracking. |
| Temperature Sensing | On-die sensor, 0.125°C LSB, ±3°C accuracy - eliminates external thermistor need while maintaining thermal-aware SOC correction. |
| Auxiliary Inputs | Two 11-bit ratiometric AIN0/AIN1 channels with VOUT reference - enables high-accuracy thermistor or pack ID resistor ratio measurement without supply tolerance error. |
| Power Consumption | Active mode: 50 µA typical; Sleep mode: 1 µA typical - extends host-system standby time without sacrificing measurement readiness. |
| I²C Interface | Standard-mode (up to 400 kHz), open-drain SDA/SCL, bus-low timeout (1.5–2.2 s) - ensures robust communication with common microcontrollers and automatic low-power entry. |
| EEPROM Storage | On-chip EEPROM (60h–7Fh) with SRAM shadow - allows field-programmable OCV breakpoints, capacity scaling factors, and calibration data without external memory. |
Pinout & Package
DS2786G-C29+ uses a 3 mm × 3 mm, 10-pin TDFN-EP (exposed pad) package rated for -20°C to +70°C operation. The exposed pad must be connected to VSS for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 AIN1 | Auxiliary voltage input #1 | Measures ratiometric voltage for thermistor or ID resistor; optionally replaced by on-die temperature sensor when ITEMP bit is set. |
| 2 AIN0 | Auxiliary voltage input #0 | Ratiometric input for second resistor network; used alongside AIN1 for dual-parameter pack identification or thermal profiling. |
| 3 SCL | I²C clock input | Open-drain compatible clock line with 0.2 µA pulldown; detects bus disconnection and triggers wake-up from Sleep mode. |
| 4 SDA | I²C data I/O | Open-drain bidirectional data line with 0.2 µA pulldown; supports standard-mode I²C read/write to all registers including EEPROM shadow RAM. |
| 5 SNS | Current-sense differential input (+) | Connects to handset side of sense resistor; measures voltage drop across RSNS to determine bidirectional current flow. |
| 6 VSS | Ground reference | Common return for current sense, auxiliary inputs, and exposed pad; must tie to battery-side of RSNS for accurate differential measurement. |
| 7 VPROG | EEPROM programming voltage | Accepts 14–15 V for factory programming; must be tied to VSS during normal operation to prevent unintended writes. |
| 8 VOUT | Reference output for ratiometric dividers | Drives resistive dividers for AIN0/AIN1; reduces system current draw and removes supply-voltage dependency from ratio measurements. |
| 9 VIN | Battery voltage input | High-impedance (>15 MΩ) input for 0–4.5 V cell or averaged pack voltage; supports multi-cell configurations via external divider. |
| 10 VDD | Power supply input | 2.5–4.5 V supply with decoupling required; powers internal circuitry, ADC, and I²C interface logic. |
Key Features
| Feature | Design Value |
|---|---|
| Hybrid OCV + Coulomb Counting | Combines immediate OCV-based SOC estimation after pack insertion with drift-corrected coulomb integration - delivers accurate % remaining capacity without learning cycles. |
| Programmable OCV Cell Model | 9-point piecewise-linear voltage-vs-capacity curve stored in EEPROM (addresses 61h–79h) - supports customization for diverse Li-ion chemistries and aging profiles. |
| Configurable Current Offset Bias | COBR register (60h) adjusts raw current readings in 25 µV/RSNS steps (±3.2 mV/RSNS) - compensates for static PCB-level offset errors or intentional accumulation skew. |
| Ratiometric Auxiliary Inputs | AIN0/AIN1 use VOUT as reference to eliminate supply-voltage error - achieves ±8 LSB accuracy for thermistor resistance or pack ID without precision regulators. |
| Auto-Sleep with Bus Wake-Up | Enters 1 µA Sleep mode after 1.5–2.2 s bus inactivity; wakes instantly on SCL or SDA high - minimizes quiescent power while ensuring responsiveness to host commands. |
Applications
| 3G Multimedia Wireless Handsets | Digital Still Cameras |
|---|---|
Use Scenario: Real-time battery level reporting during video capture, GPS use, and cellular transmission with rapid load transients. IC Role / Device Role / Timing Role: Host-side fuel gauge providing % remaining, voltage, current, and temperature over I²C; triggers low-battery warning before critical shutdown. Use Value: Eliminates first-cycle learning delay - delivers accurate SOC immediately after battery insertion, improving user experience and preventing premature shutdown. | Use Scenario: Monitoring high-pulse-current battery discharge during flash charging, image burst capture, and LCD backlight control. IC Role / Device Role / Timing Role: Standalone coulomb counter with OCV correction during camera idle periods; reports accumulated Ah and relative capacity via I²C. Use Value: Maintains <±5% SOC error across charge/discharge cycles using programmable capacity scaling and learned aging compensation. |
| Digital Audio (MP3) Players | Portable Medical Monitors |
Use Scenario: Long-duration playback with variable audio codec power consumption and intermittent USB charging. IC Role / Device Role / Timing Role: Low-power fuel gauge operating in Sleep mode between host polls; wakes on I²C request to deliver updated voltage, current, and temperature. Use Value: Achieves 1 µA typical sleep current - extends device runtime between charges without sacrificing measurement fidelity. | Use Scenario: Battery-powered ECG or pulse oximeter requiring reliable runtime estimation under strict safety and regulatory constraints. IC Role / Device Role / Timing Role: Host-integrated fuel gauge supplying calibrated voltage, current, and temperature data to firmware for predictive low-battery alerts and loggable health metrics. Use Value: On-die temperature sensor (±3°C) and EEPROM-stored OCV model ensure traceable, repeatable SOC calculation compliant with medical device design controls. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fuel gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ27426YZFT | Integrated gas gauge with embedded impedance track algorithm; requires system-side firmware support; no standalone OCV table programming. | Designed for TI ecosystem microcontrollers; relies on host processor for model updates and learning - less autonomous than DS2786G-C29+. | Choose BQ27426YZFT if using MSP430 or C2000 MCU with Impedance Track SDK; avoid if seeking plug-and-play OCV model customization. |
| MAX17048G+T | Similar 10-pin TDFN package; uses ModelGauge m3 algorithm; higher current resolution (15.625 µV/RSNS); no ratiometric aux inputs or VOUT pin. | Lacks AIN0/AIN1 ratiometric capability and VOUT reference - cannot directly replace DS2786G-C29+ in thermistor-ID or precision divider applications. | Choose MAX17048G+T for higher-resolution current sensing where auxiliary measurements are handled externally; verify OCV model update workflow compatibility. |
Compared with BQ27426YZFT and MAX17048G+T, the DS2786G-C29+ uniquely combines standalone OCV table programmability, ratiometric auxiliary inputs with integrated VOUT, and sub-µA sleep current - making it optimal for cost-sensitive, host-agnostic, and thermistor-ID-reliant portable designs.
Availability
DS2786G-C29+ is available at Aetrix Electronics and suitable for 3G handsets, digital cameras, MP3 players, and portable medical monitors requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for DS2786G-C29+ 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, communications, and consumer applications.
The DS2786G-C29+ belongs to Maxim's standalone fuel gauge product line, engineered specifically for host-side battery capacity estimation in cost-constrained portable electronics without requiring complex host firmware or external calibration components.
FAQ
What is the primary function of the DS2786G-C29+ in a battery management system?
The DS2786G-C29+ serves as a standalone fuel gauge IC that estimates remaining battery capacity (%) using a hybrid method: open-circuit voltage (OCV) lookup during system idle periods and coulomb counting during active load. It reports voltage, current, temperature, and relative capacity over I²C - all without requiring host-side learning algorithms. Its design eliminates first-cycle inaccuracies and supports immediate SOC reporting after battery insertion.
Does the DS2786G-C29+ require an external thermistor for temperature measurement?
No. The DS2786G-C29+ includes an on-die temperature sensor with ±3°C accuracy and 0.125°C resolution, accessible via the Temperature Register (0Ah–0Bh) when the ITEMP bit is enabled. This eliminates the need for an external thermistor in many applications. However, AIN1 can still be used for external thermistor measurement if higher accuracy or remote sensing is required - the IC supports either mode, but not simultaneously.
How does the DS2786G-C29+ handle current-sense resistor variation across production units?
The DS2786G-C29+ accommodates sense resistor tolerance through its Current Offset Bias Register (COBR, address 60h), which allows adding or subtracting up to ±3.2 mV/RSNS in 25 µV/RSNS steps. This enables per-unit calibration to cancel static PCB-level offset errors. Additionally, the Initial Capacity Scaling Factor (7Ah) and Learned Capacity Scaling Factor (17h) registers scale accumulated current based on actual RSNS value - ensuring accurate Ah-to-% conversion regardless of resistor variance.
Can the OCV voltage-vs-capacity profile in the DS2786G-C29+ be customized for different battery cells?
Yes. The DS2786G-C29+ stores a 9-point piecewise-linear OCV model in EEPROM (addresses 61h–79h), with capacity breakpoints (0.5% resolution) and voltage breakpoints (1.22 mV resolution) fully programmable via I²C. The factory default model is modifiable to match specific Li-ion or Li-polymer cell characteristics, including aging effects - enabling accurate SOC estimation across diverse chemistries and vendors without hardware changes.
What is the role of the VOUT pin on the DS2786G-C29+ and why is it important?
The VOUT pin on the DS2786G-C29+ supplies a stable reference voltage to drive resistive dividers connected to AIN0 and AIN1. By using VOUT instead of VDD as the reference, ratiometric measurements eliminate errors caused by supply voltage drift or tolerance - achieving ±8 LSB accuracy for thermistor or pack ID resistor readings. This feature reduces BOM cost and improves measurement reliability in variable-input-voltage systems.
DS2786G-C29+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Function:
- Fuel Gauge
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 1
- Fault Protection:
- -
- Interface:
- I2C
- Operating Temperature:
- -20°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-TDFN (3x3)
DS2786G-C29+ FAQ
1.How can I place an order for DS2786G-C29+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS2786G-C29+ 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 DS2786G-C29+ reliable?
The price and inventory of DS2786G-C29+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS2786G-C29+ is usually 5 days.
3.What payment methods are accepted for DS2786G-C29+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS2786G-C29+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS2786G-C29+?
DS2786G-C29+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS2786G-C29+ 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 DS2786G-C29+?
For technical support, including DS2786G-C29+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS2786G-C29+ requirements.
6.How does Aetrix verify that DS2786G-C29+ is sourced from the original manufacturer or authorized distributors?
All DS2786G-C29+ 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 DS2786G-C29+ meets industry standards.
7.What is the process for return or replacement of DS2786G-C29+?
All DS2786G-C29+ units undergo pre-shipment inspection (PSI). If there is an issue with DS2786G-C29+, 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 DS2786G-C29+ part is unused and in its original packaging.
Return procedure for DS2786G-C29+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DS2786G-C29+ Tags
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