BQ27220 Datasheet, PDF (1/6 Pages) Texas Instruments – Single-Cell CEDV Fuel Gauge

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bq27220 Single-Cell CEDV Fuel Gauge
bq27220
SLUSCB7 – MARCH 2016
1 Features
•1 Single-Cell Li-Ion Battery Fuel Gauge
– Resides in Pack or on System Board
– Supports Embedded or Removable Batteries
– Powers Directly from Battery with Integrated
LDO
– Supports a Low-Value (10-mΩ) External Sense
Resistor
• Ultra-Low Power Consumption in NORMAL
(50 µA) and SLEEP (9 µA) Modes
• Battery Fuel Gauging Based on Compensated
End-of-Discharge Voltage (CEDV) Technology
– Reports Remaining Capacity and State-of-
Charge (SOC) with Smoothing Filter
– Adjusts Automatically for Battery Aging, Self-
Discharge, Temperature, and Rate Changes
– Provides Battery State-of-Health (Aging)
Estimation
• Microcontroller Peripheral Supports:
– 400-kHz I²C™ Serial Interface
– Configurable SOC Interrupt OR
Battery Low Digital Output Warning
– Internal Temperature Sensor OR
Host-Reported Temperature OR
External Thermistor
2 Applications
• Smartphones and Feature Phones
• Tablets
• Wearables
• Building Automation
• Portable Medical/Industrial Handsets
• Portable Audio
• Gaming
3 Description
The Texas Instruments bq27220 battery fuel gauge is
a single-cell gauge that requires minimal user-
configuration and system microcontroller firmware
development, leading to quick system bring-up. The
bq27220 device uses the Compensated End-of-
Discharge Voltage (CEDV) algorithm for fuel gauging,
and provides information such as remaining battery
capacity (mAh), state-of-charge (%), runtime-to-empty
(min), battery voltage (mV), temperature (°C), and
state-of-health (%).
The bq27220 battery fuel gauge has ultra-low power
consumption in NORMAL (50 μA) and SLEEP (9 μA)
modes, leading to longer battery run time.
Configurable interrupts help save system power and
free up the host from continuous polling. Accurate
temperature sensing is supported via an external
thermistor.
Customers can use preloaded CEDV parameters in
ROM or can generate custom chemistry parameters
using TI's web-based tool, GAUGEPARCAL. Custom-
generated parameters can either be programmed in
device RAM by the host on power up of the system or
customers can program the parameters to an
onboard One-Time Programmable (OTP) memory.
Battery fuel gauging with the bq27220 device requires
connections only to PACK+ (P+) and PACK– (P–) for
a removable battery pack or embedded battery
circuit. The tiny, 9-ball, 1.62 mm × 1.58 mm, 0.5-mm
pitch NanoFree™ chip scale package (DSBGA) is
ideal for space-constrained applications.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
bq27220
YZF (9)
1.62 mm × 1.58 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic (System-Side)
I²C
SCL
Bus SDA
GPOUT
Coulomb
Counter
CPU
ADC
1.8 V
LDO
SRN
VSYS
SRP
BAT
BIN
VDD
2.2 µF
VSS
P ACKP
T
1 µF
PACKN
Battery Pack
Li - Ion
Cell
Protection
IC
NFET NFET
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCT PREVIEW Information. Product in design phase of
development. Subject to change or discontinuance without notice.