ZHCSJR3B February 2019 – November 2019 BQ25887
PRODUCTION DATA.
- 1 特性
- 2 應用
- 3 說明
- 4 修訂歷史記錄
- 5 Device Comparison Table
- 6 Pin Configuration and Functions
- 7 Specifications
-
8 Detailed Description
- 8.1 Overview
- 8.2 Functional Block Diagram
- 8.3
Feature Description
- 8.3.1 Device Power-On-Reset
- 8.3.2 Device Power Up from Input Source
- 8.3.3 Input Current Optimizer (ICO)
- 8.3.4 Battery Charging Management
- 8.3.5 Integrated 16-Bit ADC for Monitoring
- 8.3.6 Status Outputs
- 8.3.7 Input Current Limit on ILIM Pin
- 8.3.8 Voltage and Current Monitoring
- 8.3.9 Thermal Regulation and Thermal Shutdown
- 8.3.10 Battery Protection
- 8.3.11 Serial Interface
- 8.4 Device Functional Modes
- 8.5
Register Maps
- 8.5.1 Cell Voltage Regulation Limit Register (Address = 00h) [reset = A0h]
- 8.5.2 Charger Current Limit Register (Address = 01h) [reset = 5Eh]
- 8.5.3 Input Voltage Limit Register (Address = 02h) [reset = 84h]
- 8.5.4 Input Current Limit Register (Address = 03h) [reset = 39h ]
- 8.5.5 Precharge and Termination Current Limit Register (Address = 04h) [reset = 22h]
- 8.5.6 Charger Control 1 Register (Address = 05h) [reset = 9Dh]
- 8.5.7 Charger Control 2 Register (Address = 06h) [reset = 7Dh]
- 8.5.8 Charger Control 3 Register (Address = 07h) [reset = 00h]
- 8.5.9 Charger Control 4 Register (Address = 08h) [reset = 0Dh]
- 8.5.10 Reserved Register (Address = 09h) [reset = 00h]
- 8.5.11 ICO Current Limit in Use Register (Address = 0Ah) [reset = XXh]
- 8.5.12 Charger Status 1 Register (Address = 0Bh) [reset = XXh]
- 8.5.13 Charger Status 2 Register (Address = 0Ch) [reset = XXh]
- 8.5.14 NTC Status Register (Address = 0Dh) [reset = 0Xh]
- 8.5.15 FAULT Status Register (Address = 0Eh) [reset = XXh]
- 8.5.16 Charger Flag 1 Register (Address = 0Fh) [reset = 00h]
- 8.5.17 Charger Flag 2 Register (Address = 10h) [reset = 00h]
- 8.5.18 FAULT Flag Register (Address = 11h) [reset = 00h]
- 8.5.19 Charger Mask 1 Register (Address = 12h) [reset = 00h]
- 8.5.20 Charger Mask 2 Register (Address = 13h) [reset = 00h]
- 8.5.21 FAULT Mask Register (Address = 14h) [reset = 00h]
- 8.5.22 ADC Control Register (Address = 15h) [reset = 30h]
- 8.5.23 ADC Function Disable Register (Address = 16h) [reset = 00h]
- 8.5.24 IBUS ADC 1 Register (Address = 17h) [reset = 00h]
- 8.5.25 IBUS ADC 0 Register (Address = 18h) [reset = 00h]
- 8.5.26 ICHG ADC 1 Register (Address = 19h) [reset = 00h]
- 8.5.27 ICHG ADC 0 Register (Address = 1Ah) [reset = 00h]
- 8.5.28 VBUS ADC 1 Register (Address = 1Bh) [reset = 00h]
- 8.5.29 VBUS ADC 0 Register (Address = 1Ch) [reset = 00h]
- 8.5.30 VBAT ADC 1 Register (Address = 1Dh) [reset = 00h]
- 8.5.31 VBAT ADC 0 Register (Address = 1Eh) [reset = 00h]
- 8.5.32 VCELLTOP ADC 1 Register (Address = 1Fh) [reset = 00h]
- 8.5.33 VCELLTOP ADC 0 Register (Address = 20h) [reset = 00h]
- 8.5.34 TS ADC 1 Register (Address = 21h) [reset = 00h]
- 8.5.35 TS ADC 0 Register (Address = 22h) [reset = 00h]
- 8.5.36 TDIE ADC 1 Register (Address = 23h) [reset = 00h]
- 8.5.37 TDIE ADC 0 Register (Address = 24h) [reset = 00h]
- 8.5.38 Part Information Register (Address = 25h) [reset = 28h]
- 8.5.39 VCELLBOT ADC 1 Register (Address = 26h) [reset = 00h]
- 8.5.40 VCELLBOT ADC 0 Register (Address = 27h) [reset = 00h]
- 8.5.41 Cell Balancing Control 1 Register (Address = 28h) [reset = 2Ah]
- 8.5.42 Cell Balancing Control 2 Register (Address = 29h) [reset = F4h]
- 8.5.43 Cell Balancing Status and Control Register (Address = 2Ah) [reset = 81h]
- 8.5.44 Cell Balancing Flag Register (Address = 2Bh) [reset = 00h]
- 8.5.45 Cell Balancing Mask Register (Address = 2Ch) [reset = 00h]
- 9 Application and Implementation
- 10Power Supply Recommendations
- 11Layout
- 12器件和文檔支持
- 13機械、封裝和可訂購信息
8.3.4.2 Battery Charging Profile
The device charges the battery in five phases: trickle charge, pre-charge, constant current, constant voltage, and top-off timer charging (optional). At the beginning of a charging cycle, the device checks the battery voltage and regulates current/voltage accordingly.
Table 3. Default Charging Current Setting
| VBAT | CHARGING CURRENT | REGISTER DEFAULT SETTING | CHRG_STAT |
|---|---|---|---|
| < VCELL_SHORT | IBAT_SHORT | 100 mA | 001 |
| VCELL_SHORT – VCELL_LOWV | IPRECHG | 150 mA | 010 |
| > VCELL_LOWV | ICHG | 1500 mA | 011 |
If the charger device is in DPM regulation or thermal regulation during charging, the actual charging current will be less than the programmed value. In this case, termination is temporarily disabled and the charging safety timer is counted at half the clock rate, as explained in the Charging Safety Timer section.
.gif "BQ25887 Battery Charging Profile")
Figure 9. Battery Charging Profile