DS2788 is a battery management chip produced by ON Semiconductor. It supports the measurement of voltage, temperature, and current of lithium batteries, and estimates the available capacity. The chip stores battery characteristic parameters in on-chip EEPROM. According to these parameters, the remaining capacity of the battery can be calculated in mAh. The chip also supports LED display of battery capacity, which only requires a resistor to set the current in the LED display, thus reducing cost and space.
The DS2788 is a stand‑alone fuel‑gauge IC designed for single‑cell Li⁺ and Li‑polymer batteries. It integrates voltage, temperature and current measurement, on‑chip capacity estimation, and five open‑drain LED drivers for a simple capacity display.
The device operates from 2.5 V to 5.5 V, provides a 24‑byte EEPROM for user data, and communicates via a 1‑Wire interface supporting standard (16 kbps) and over‑drive (140 kbps) modes. Power‑saving modes (ACTIVE and SLEEP) reduce consumption when the battery is idle.
| Supply Voltage (Vopb) | 2.5 V – 5.5 V |
|---|---|
| Voltage Resolution (VLSB) | 4.88 mV |
| Temperature Resolution (TLSB) | 0.125 °C |
| Current Resolution (ILSB) | 1.56 µV |
The DS2788 operates from 2.5 V to 5.5 V.
The device provides 16 bytes of user EEPROM.
Temperature is measured with a resolution of 0.125 °C.
It uses a 1‑Wire interface that supports standard (16 kbps) and over‑drive (140 kbps) speeds.