BQ78Z100 Datasheet, PDF (1/39 Pages) Texas Instruments – Impedance Track Gas Gauge

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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
•1 High-Accuracy Coulomb Counter with Input Offset
Error < 1 µV (Typical)
• High-Side FET Drive Allows Serial Bus
Communication During Fault Conditions
• Analog Front End with Two Independent ADCs
– Support for Simultaneous Current and Voltage
Sampling
• Bus Communications Interface Options
– I²C
– HDQ
• SHA-1 Hash Message Authentication Code
(HMAC) Responder for Increased Battery Pack
Security
– Split Key (2 × 64) Stored in Secure Memory
• Programmable Protection Levels for:
– Overcurrent in Discharge
– Short-Circuit Current in Charge
– Short-Circuit Current in Discharge
– Overvoltage
– Undervoltage
– Overtemperature
• Supports a 1-mΩ to 3-mΩ Current Sense Resistor
• Compact 12-Terminal SON Package (DRZ)
2 Applications
• Portable and Wearable Health Devices
• Portable Radios
• Industrial Data Collection
3 Description
The bq78z100 device provides a fully integrated
pack-based solution with a flash programmable
custom reduced instruction-set CPU (RISC), safety
protection, and authentication for 1-series to 2-series
cell Li-Ion and Li-Polymer battery packs.
The bq78z100 gas gauge communicates via an I²C-
compatible interface or single-wire HDQ interface and
combines an ultra-low-power, high-speed TI bqBMP
processor, high-accuracy analog measurement
capabilities, integrated flash memory, an array of
peripheral and communication ports, an N-channel
FET drive, and a SHA-1 Authentication transform
responder into a complete, high-performance battery
management solution.
The bq78z100 device provides an array of battery
and system safety functions, including overcurrent in
discharge, short circuit in charge, and short circuit in
discharge protection for the battery, as well as FET
protection for the N-channel FETs, internal AFE
watchdog, and cell balancing. Through firmware, the
devices can provide a larger array of features
including protection against overvoltage,
undervoltage, overtemperature, and more.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
bq78z100
VSON (12)
4.00 mm × 2.50 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
4 Simplified Schematic
Pack+
0.1 µF
Comm
Bus
Pack–
10k
100
100
100
MM 3Z5V 6C
100
100 100
MM3 Z5V 6C
1 to 3 mΩ
1 VSS
13
PWPD
2 SRN
3 SRP
4 TS 1
5 SCL
6 SDA/HDQ
10 M
10 M
Fuse
VC1 12
VC2 11
PBI 10
CHG 9
PACK 8
100
0.1 µF
1 µF
5
5.1 k
2.2 µF
5.1 k
10
2s
1s
Battery
cells
DSG 7
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.