This document introduces the MAXIM DS2782 battery monitor chip, which can measure battery voltage, temperature and current, and estimate available capacity.
The DS2782 is a standalone fuel‑gauge IC that measures voltage, temperature and current to estimate remaining capacity of single‑cell lithium‑ion or lithium‑polymer batteries. It operates from 2.5 V to 5.5 V, provides a 2‑wire interface, and includes on‑chip EEPROM for user data and a selectable 64‑bit unique ID.
The document lists absolute maximum ratings, recommended operating characteristics, pin descriptions, electrical specifications, power‑mode operation, and communication protocols. It also details the block diagram, multicell application example, and EEPROM command set.
| Operating Temperature Range | -40 °C to +85 °C |
|---|---|
| Voltage Resolution | 4.88 mV |
| Temperature Resolution | 0.125 °C |
| Current Resolution | 1.56 µV |
| EEPROM Copy Time | 10 ms |
| User EEPROM Size | 24 bytes (or 16 bytes depending on part) |
| Unique ID Option | 64‑bit factory‑programmed identifier |
The device provides up to 24 bytes of user EEPROM (some revisions offer 16 bytes).
Yes, a special‑order version includes a unique 64‑bit factory‑programmed ID.
The integrated temperature sensor resolves temperature to 0.125 °C.