ZHCSKO3B January 2020 – September 2020 BQ25611D
PRODUCTION DATA
- 1 特性
- 2 應用
- 3 說明
- 4 Revision History
- 5 說明（續）
- 6 Device Comparison Table
- 7 Pin Configuration and Functions
- 8 Specifications
-
9 Detailed Description
- 9.1 Overview
- 9.2 Functional Block Diagram
- 9.3
Feature Description
- 9.3.1 Power-On-Reset (POR)
- 9.3.2 Device Power Up from Battery without Input Source
- 9.3.3 Power Up from Input Source
- 9.3.4 Boost Mode Operation From Battery
- 9.3.5 Power Path Management
- 9.3.6 Battery Charging Management
- 9.3.7 Ship Mode and QON Pin
- 9.3.8 Status Outputs ( STAT, INT )
- 9.3.9 Protections
- 9.3.10 Serial Interface
- 9.4 Device Functional Modes
- 9.5 Register Maps
- 10Application and Implementation
- 11Power Supply Recommendations
- 12Layout
- 13Device and Documentation Support
- 14Mechanical, Packaging, and Orderable Information
9.3.6.2 Battery Charging Profile
The device charges the battery in five phases: battery short, preconditioning, constant current, constant voltage and top-off trickle charging (optional). At the beginning of a charging cycle, the device checks the battery voltage and regulates current and voltage accordingly.
Resistance between charger output and battery cell terminal such as board routing, connector, MOSFETs and sense resistor can force the charging process to move from constant current to constant voltage too early and increase charge time. To speed up the charging cycle, the device provides BATSNS pin to extend the constant current charge time to delivery maximum power to battery. BATSNS pin is connected directly to battery cell terminal to remotely sense battery cell voltage. BATSNS is by default enabled, and can be disabled through BATSNS_DIS bit. If BATSNS is connected to GND or left floating, the charger regulates BAT pin instead.
| VBAT | CHARGING CURRENT | DEFAULT SETTING | CHRG_STAT |
|---|---|---|---|
| < 2.2 V | IBAT_SHORT | 100 mA | 01 |
| 2.2 V to 3 V | IPRECHG | 180 mA | 01 |
| > 3 V | ICHG | 1020 mA | 10 |
Figure 9-4 Battery Charging Profile