4

5

6

7

8

11

12

PBI

VC2

VC1

SRN

SRP

VSS

TS 1

SCL

SDA/HDQ

PACK

3

2

1

9

10

CHG

DSG

100

100

MM3Z5V6C

100

100

10k

0.1 µF

1 µF

0.1 µF

2.2 µF

100

5

5.1 k

5.1 k

10 M

10 M

10

100

100

1 to 3 m

Fuse

1 s

2 s

PWPD

13

MM3Z5V6C

Pack+

Pack–

Comm

Bus

Battery

cells

Product

Folder

Sample &

Buy

Technical

Documents

Tools &

Software

Support &

Community

bq78z100

SLUSC23 – SEPTEMBER 2015

bq78z100 Impedance Track™ Gas Gauge for 1-Series to 2-Series

Li-Ion/Li-Polymer Battery Packs

Check for Samples: bq78z100

1 Features

3 Description

The bq78z100 device provides a fully integrated

1

•

High-Accuracy Coulomb Counter with Input Offset

pack-based solution with a flash programmable

Error < 1 µV (Typical)

custom reduced instruction-set CPU (RISC), safety

•

High-Side FET Drive Allows Serial Bus

protection, and authentication for 1-series to 2-series

Communication During Fault Conditions

cell Li-Ion and Li-Polymer battery packs.

•

Analog Front End with Two Independent ADCs

–

Support for Simultaneous Current and Voltage

compatible interface or single-wire HDQ interface and

Sampling

combines an ultra-low-power, high-speed TI bqBMP

processor,

high-accuracy

analog

measurement

•

Bus Communications Interface Options

capabilities, integrated flash memory, an array of

–

peripheral and communication ports, an N-channel

–

HDQ

FET drive, and a SHA-1 Authentication transform

responder into a complete, high-performance battery

•

SHA-1 Hash Message Authentication Code

management solution.

(HMAC) Responder for Increased Battery Pack

Security

The bq78z100 device provides an array of battery

and system safety functions, including overcurrent in

–

Split Key (2 × 64) Stored in Secure Memory

discharge, short circuit in charge, and short circuit in

•

Programmable Protection Levels for:

discharge protection for the battery, as well as FET

–

Overcurrent in Discharge

protection for the N-channel FETs, internal AFE

–

Short-Circuit Current in Charge

watchdog, and cell balancing. Through firmware, the

devices can provide a larger array of features

–

Short-Circuit Current in Discharge

including

protection

against

overvoltage,

–

Overvoltage

undervoltage, overtemperature, and more.

–

Undervoltage

Device Information(1)

–

Overtemperature

PART NUMBER

PACKAGE

BODY SIZE (NOM)

•

Supports a 1-m

Ω to 3-mΩ Current Sense Resistor

bq78z100

VSON (12)

4.00 mm × 2.50 mm

•

Compact 12-Terminal SON Package (DRZ)

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

2 Applications

•

Portable and Wearable Health Devices

4 Simplified Schematic

•

Portable Radios

•

Industrial Data Collection

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. PRODUCTION DATA.