ZHCSO20 may 2021 BQ25723
PRODUCTION DATA
- 1
- 1 特性
- 2 应用
- 3 说明
- 4 Revision History
- 5 Description (continued)
- 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-Up Sequence
- 9.3.2 Vmin Active Protection (VAP) with Battery only
- 9.3.3 Two-Level Battery Discharge Current Limit
- 9.3.4 Fast Role Swap Feature
- 9.3.5 CHRG_OK Indicator
- 9.3.6 Input and Charge Current Sensing
- 9.3.7 Input Voltage and Current Limit Setup
- 9.3.8 Battery Cell Configuration
- 9.3.9 Device HIZ State
- 9.3.10 USB On-The-Go (OTG)
- 9.3.11 Converter Operation
- 9.3.12 Inductance Detection Through IADPT Pin
- 9.3.13 Converter Compensation
- 9.3.14 Continuous Conduction Mode (CCM)
- 9.3.15 Pulse Frequency Modulation (PFM)
- 9.3.16 Switching Frequency and Dithering Feature
- 9.3.17 Current and Power Monitor
- 9.3.18 Input Source Dynamic Power Management
- 9.3.19 Input Current Optimizer (ICO)
- 9.3.20 Two-Level Adapter Current Limit (Peak Power Mode)
- 9.3.21 Processor Hot Indication
- 9.3.22
Device Protection
- 9.3.22.1 Watchdog Timer
- 9.3.22.2 Input Overvoltage Protection (ACOV)
- 9.3.22.3 Input Overcurrent Protection (ACOC)
- 9.3.22.4 System Overvoltage Protection (SYSOVP)
- 9.3.22.5 Battery Overvoltage Protection (BATOVP)
- 9.3.22.6 Battery Discharge Overcurrent Protection (BATOC)
- 9.3.22.7 Battery Short Protection (BATSP)
- 9.3.22.8 System Undervoltage Lockout (VSYS_UVP) and Hiccup Mode
- 9.3.22.9 Thermal Shutdown (TSHUT)
- 9.4 Device Functional Modes
- 9.5 Programming
- 9.6
Register Map
- 9.6.1 ChargeOption0 Register (I2C address = 01/00h) [reset = E70Eh]
- 9.6.2 ChargeCurrent Register (I2C address = 03/02h) [reset = 0000h]
- 9.6.3 ChargeVoltage Register (I2C address = 05/04h) [reset value based on CELL_BATPRESZ pin setting]
- 9.6.4 ChargerStatus Register (I2C address = 21/20h) [reset = 0000h]
- 9.6.5 ProchotStatus Register (I2C address = 23/22h) [reset = B800h]
- 9.6.6 IIN_DPM Register (I2C address = 25/24h) [reset = 4100h]
- 9.6.7 ADCVBUS/PSYS Register (I2C address = 27/26h)
- 9.6.8 ADCIBAT Register (I2C address = 29/28h)
- 9.6.9 ADCIIN/CMPIN Register (I2C address = 2B/2Ah)
- 9.6.10 ADCVSYS/VBAT Register (I2C address = 2D/2Ch)
- 9.6.11 ChargeOption1 Register (I2C address = 31/30h) [reset = 3300h]
- 9.6.12 ChargeOption2 Register (I2C address = 33/32h) [reset = 00B7]
- 9.6.13 ChargeOption3 Register (I2C address = 35/34h) [reset = 0434h]
- 9.6.14 ProchotOption0 Register (I2C address = 37/36h) [reset = 4A81h(2S~4s) 4A09(1S)]
- 9.6.15 ProchotOption1 Register (I2C address = 39/38h) [reset = 41A0h]
- 9.6.16 ADCOption Register (I2C address = 3B/3Ah) [reset = 2000h]
- 9.6.17 ChargeOption4 Register (I2C address = 3D/3Ch) [reset = 0048h]
- 9.6.18 Vmin Active Protection Register (I2C address = 3F/3Eh) [reset = 006Ch(2s~4s)/0004h(1S)]
- 9.6.19 OTGVoltage Register (I2C address = 07/06h) [reset = 09C4h]
- 9.6.20 OTGCurrent Register (I2C address = 09/08h) [reset = 3C00h]
- 9.6.21 InputVoltage(VINDPM) Register (I2C address = 0B/0Ah) [reset =VBUS-1.28V]
- 9.6.22 VSYS_MIN Register (I2C address = 0D/0Ch) [reset value based on CELL_BATPRESZ pin setting]
- 9.6.23 IIN_HOST Register (I2C address = 0F/0Eh) [reset = 4100h]
- 9.6.24 ID Registers
- 10Application and Implementation
- 11Power Supply Recommendations
- 12Layout
- 13Device and Documentation Support
- 14Mechanical, Packaging, and Orderable Information
10.2.2.1 ACP-ACN Input Filter
The BQ25723 has average current mode control. The input current sensing through ACP/ACN is critical to recover inductor current ripple. Parasitic inductance on board will generate high frequency ringing on ACP-ACN which overwhelms converter sensed inductor current information. It is also difficult to manage parasitic inductance created based on different PCB layout. Larger parasitic inductance will generate larger sense current ringing which could cause the average current control loop to go into oscillation. Therefore ACP-ACN sensing information need to be conditioned.
For real system board condition, we suggest using below circuit design to get best result and filter noise induced from different PCB parasitic factor. With time constant of filter from 47 ns to 200 ns, the filter is effective and the delay of on the sensed signal is small, therefore there is no concern for average current mode control.
Figure 10-2 ACN-ACP Input Filter