1FEATURES

• Serial Non-Volatile Memory (NVM)

– 512 Byte (4Kb) EEPROM

– Provides Battery Pack NVM storage for

bq27505-E1 Fuel Gauge:

– Manufacturing Data

– Operational History

– Resistance Tables

– State of Health Information

• Single Wire HDQ Communications Port

• Integrated 2.5V LDO Linear Regulator

– Ultra-low power “shutdown” mode (1μA

Typical) via auto-timeout and/or host

command

– Wake up from shutdown via HDQ break

• Internal Die-Temperature Sensor

– ±5°C Range = –40°C to 85°C

– Raw AD to Temperature Conversion

Performed by Host Firmware

• Package

– 12-pin, 1490 × 2350 μm WCSP (YZG),

0.625mm Max Thickness, 0.5mm Pitch

DESCRIPTION

The Texas Instruments bq2028 serial 4Kb nonvolatile

memory (EEPROM) with integrated temperature

sensor and LDO linear regulator provides pack-side

memory storage and temperature monitoring for a

single-cell system-side battery fuel gauge solution

such as the bq27505-E1.

The bq2028 communicates with the bq27505-E1

gauge over a single-wire HDQ interface with a

minimal overhead protocol yet ensures error free data

transfer.