The bq3055 device is a fully integrated, single-chip, pack-based solution that provides a rich array of features for gas gauging, protection, and authentication for 2-series, 3-series, and 4-series cell Li-Ion and Li-Polymer battery packs.
Using its integrated high-performance analog peripherals, the bq3055 device measures and maintains an accurate record of available capacity, voltage, current, temperature, and other critical parameters in Li-Ion or Li-Polymer batteries, and reports this information to the system host controller over an SMBus v1.1 compatible interface.
The bq3055 provides software-based 1st-level and 2nd-level safety protection for overvoltage, undervoltage, overtemperature, and overcharge conditions, as well as hardware-based protection for overcurrent in discharge and short circuit in charge and discharge conditions.
SHA-1 authentication with secure memory for authentication keys enables identification of genuine battery packs beyond any doubt.
The compact 30-lead TSSOP package minimizes solution cost and size for smart batteries while providing maximum functionality and safety for battery gauging applications.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
bq3055 | TSSOP (30) | 7.80 mm × 4.40 mm |
Changes from B Revision (October 2013) to C Revision
Changes from A Revision (June 2011) to B Revision
PIN | TYPE(1) | DESCRIPTION | |
---|---|---|---|
NAME | NO. | ||
BAT | 2 | P | Alternate power source |
CHG | 1 | O | Charge N-FET gate drive |
DSG | 30 | O | Discharge N-FET gate drive |
FUSE | 26 | O | Fuse drive |
NC | 14 | — | Not internally connected. Connect to VSS. |
NC | 16 | — | Not internally connected. Connect to VSS. |
NC | 17 | — | Not internally connected. Connect to VSS. |
NC | 18 | — | Not internally connected. Connect to VSS. |
NC | 19 | — | Not internally connected. Connect to VSS. |
NC | 20 | — | Not internally connected. Connect to VSS. |
PACK | 29 | P | Alternate power source |
PCHG | 28 | I/OD | Precharge P-FET gate drive |
PRES | 12 | I | Host system present input |
RBI | 21 | P | RAM backup |
REG25 | 22 | P | 2.5-V regulator output |
REG33 | 24 | P | 3.3-V regulator output |
SMBC | 15 | I/OD | SMBus v1.1 clock line |
SMBD | 13 | I/OD | SMBus v1.1 data line |
SRN | 10 | AI | Differential Coulomb Counter input |
SRP | 9 | AI | Differential Coulomb Counter input |
TEST | 25 | — | Test pin, connect to VSS through 2-kΩ resistor. |
TS1 | 8 | AI | Temperature sensor 1 thermistor input |
TS2 | 11 | AI | Temperature sensor 2 thermistor input |
VC1 | 3 | I | Sense input for positive voltage of top most cell in stack and cell balancing input for top most cell in stack |
VC2 | 4 | I | Sense input for positive voltage of third lowest cell in stack and cell balancing input for third lowest cell in stack |
VC3 | 5 | I | Sense input for positive voltage of second lowest cell in stack and cell balancing input for second lowest cell in stack |
VC4 | 6 | I | Sense input for positive voltage of lowest cell in stack and cell balancing input for lowest cell in stack |
VCC | 27 | P | Power supply voltage |
VSS | 7 | P | Device ground |
VSS | 23 | P | Device ground |