ZHCSPQ2 December 2022 BQ28Z620
PRODUCTION DATA
- 1 特性
- 2 应用
- 3 说明
- 4 Revision History
- 5 说明（续）
- 6 BQ28Z620 Changes from BQ28Z610-R1
- 7 Pin Configuration and Functions
-
8 Specifications
- 8.1 Absolute Maximum Ratings
- 8.2 ESD Ratings
- 8.3 Recommended Operating Conditions
- 8.4 Thermal Information
- 8.5 Supply Current
- 8.6 Power Supply Control
- 8.7 Power-On Reset (POR)
- 8.8 Internal 1.8-V LDO
- 8.9 Current Wake Comparator
- 8.10 Coulomb Counter
- 8.11 ADC Digital Filter
- 8.12 ADC Multiplexer
- 8.13 Cell Balancing Support
- 8.14 Internal Temperature Sensor
- 8.15 NTC Thermistor Measurement Support
- 8.16 High-Frequency Oscillator
- 8.17 Low-Frequency Oscillator
- 8.18 Voltage Reference 1
- 8.19 Voltage Reference 2
- 8.20 Instruction Flash
- 8.21 Data Flash
- 8.22 Current Protection Thresholds
- 8.23 Current Protection Timing
- 8.24 N-CH FET Drive (CHG, DSG)
- 8.25 I2C Interface I/O
- 8.26 I2C Interface Timing
- 8.27 Typical Characteristics
-
9 Detailed Description
- 9.1 Overview
- 9.2 Functional Block Diagram
- 9.3
Feature Description
- 9.3.1 Battery Parameter Measurements
- 9.3.2 Coulomb Counter (CC)
- 9.3.3 CC Digital Filter
- 9.3.4 ADC Multiplexer
- 9.3.5 Analog-to-Digital Converter (ADC)
- 9.3.6 ADC Digital Filter
- 9.3.7 Internal Temperature Sensor
- 9.3.8 External Temperature Sensor Support
- 9.3.9 Power Supply Control
- 9.3.10 Power-On Reset
- 9.3.11 Bus Communication Interface
- 9.3.12 I2C Timeout
- 9.3.13 Cell Balancing Support
- 9.3.14 N-Channel Protection FET Drive
- 9.3.15 Low Frequency Oscillator
- 9.3.16 High Frequency Oscillator
- 9.3.17 1.8-V Low Dropout Regulator
- 9.3.18 Internal Voltage References
- 9.3.19 Overcurrent in Discharge Protection
- 9.3.20 Short-Circuit Current in Charge Protection
- 9.3.21 Short-Circuit Current in Discharge 1 and 2 Protection
- 9.3.22 Primary Protection Features
- 9.3.23 Gas Gauging
- 9.3.24 Charge Control Features
- 9.3.25 Authentication
- 9.4 Device Functional Modes
- 10Applications and Implementation
- 11Power Supply Recommendations
- 12Layout
- 13Device and Documentation Support
- 14Mechanical, Packaging, and Orderable Information
9.3.13 Cell Balancing Support
The integrated cell balancing FETs included in the BQ28Z620 device enable the AFE to bypass cell current around a given cell or numerous cells to effectively balance the entire battery stack. External series resistors placed between the cell connections and the VCx input pins set the balancing current magnitude. The cell balancing circuitry can be enabled or disabled via the CELL_BAL_DET[CB2, CB1] control register. Series input resistors between 100 Ω and 1 kΩ are recommended for effective cell balancing.
Figure 9-3 Internal Cell Balancing