ZHCSD08D August 2014 – March 2017 BQ24392-Q1
PRODUCTION DATA.
- 1 特性
- 2 應(yīng)用
- 3 說(shuō)明
- 4 修訂歷史記錄
- 5 Pin Configuration and Functions
- 6 Specifications
- 7 Detailed Description
- 8 Application and Implementation
- 9 Power Supply Recommendations
- 10Layout
- 11器件和文檔支持
- 12機(jī)械、封裝和可訂購(gòu)信息
封裝選項(xiàng)
機(jī)械數(shù)據(jù) (封裝 | 引腳)
- RSE|10
散熱焊盤(pán)機(jī)械數(shù)據(jù) (封裝 | 引腳)
訂購(gòu)信息
7 Detailed Description
7.1 Overview
The BQ24392-Q1 is a USB 2.0 high-speed isolation switch with charger detection capabilities for use with micro and mini-USB ports. Upon plugin of a Battery Charging Specification 1.2 (BCv1.2) compliant, Apple™, TomTom™, or other USB charger into a micro or mini-USB connector, the device will automatically detect the charger and operate the USB 2.0 high-speed isolation switch.
The BQ24392-Q1 device is powered through VBUS when a charger is attached to the micro or mini-USB port and has a 28-V tolerance to avoid the need for external protection.
7.2 Functional Block Diagram
7.3 Feature Description
7.3.1 Charger Detection
Figure 3. Logic Tree
When a micro or mini-USB accessory is inserted into the connector and once VVBUS is greater than VVBUS_VALID threshold, the BQ24392-Q1 will enter into the Data Contact Detection (DCD) state which includes a 600-ms timeout feature that is prescribed in the USB Battery Charging Specification version 1.2 (BCv1.2). If the micro or mini-USB accessory is determined to be USB BCv1.2 compliant, a 130-ms debounce period will initiate and the BQ24392-Q1 will proceed to its primary detection and then secondary detection states to determine if a Dedicated Charging Port (DCP), Standard Downstream Port (SDP), or Charging Downstream Port (CDP) is attached to the USB-port. The minimum detection time for a DCP, SDP, and CDP is 130 ms, but can be as long as 600 ms due to the slow plug in effect.
If the GOOD_BAT pin is high, the USB 2.0 switches are automatically closed to enable data transfer after the device detects a Standard Downstream Port (SDP) or Charging Downstream Port (CDP) was connected.
If Data Contact Detection (DCD) fails, the BQ24392-Q1 proceeds to detect whether an Apple or TomTom charger was inserted by checking the voltage level on DP_CON and DM_CON. Thus, for Apple and TomTom chargers, detection time typically takes ~600 ms.
The 3 output pins CHG_AL_N, CHG_DET, and SW_OPEN change their status at the end of detection. Table 1 is the detection table with the GPIO status for each type of supported charger. More information on how to use the GPIOs is available in Using the BQ24392-Q1 GPIOs .
Table 1. Detection Table
| Device Type | VBUS | DP_CON (D+) |
DM_CON (D–) |
GOOD_BAT (Input) |
CHG_AL_N (Output) |
CHG_DET (Output) |
SW_OPEN (Output) |
Switch Status | Charge Current |
|---|---|---|---|---|---|---|---|---|---|
| Standard Downstream Port |
> 3.5 V | Pull-down R to GND | Pull-down R to GND | HIGH | LOW | LOW | LOW | Connected | Charge with 100mA/ Change the input current based on enumeration |
| LOW | LOW | LOW | High-Z | Not Connected | Charge with 100 mA | ||||
| Charging Downstream Port |
> 3.5 V | Pull-down R to GND | VDM_SRC | HIGH | LOW | HIGH | LOW | Connected | Charge with full current |
| LOW | LOW | HIGH | High-Z | Not Connected | Charge with 100 mA | ||||
| Dedicated Charging Port |
> 3.5 V | Short to D– | Short to D+ | X | LOW | HIGH | High-Z | Not Connected | Charge with full current |
| Apple Charger | > 3.5 V | 2.0 V < VDP_CON < 2.8 V | 2.0 V < VDM_CON < 2.8 V | X | LOW | HIGH | High-Z | Not Connected | Charge with full current |
| TomTom Charger | > 3.5 V | 2.0 V < VDP_CON < 3.1 V | 2.0 V < VDM_CON < 3.1 V | X | LOW | HIGH | High-Z | Not Connected | Charge with full current |
| PS/2 Charger | > 3.5 V | Pull-up R to VVBUS | Pull-up R to VVBUS | X | LOW | LOW | High-Z | Not Connected | Charge with 100 mA |
| Non-compliant USB Charger |
> 3.5 V | Open | Open | X | LOW | LOW | High-Z | Not Connected | Charge with 100 mA |
| Any Device | < 3.5 V | Open | Open | X | High-Z | LOW | High-Z | Not Connected | No Charge |
| Any Device DBP Timer Expired |
> 3.5 V | X | X | LOW | High-Z | LOW | High-Z | Not Connected | No Charge |
If a charger has been detected and the GOOD_BAT pin is low, a Dead Battery Provision (DBP) timer is initiated. If the GOOD_BAT continues to be low for 30 minutes (maximum of 45 minutes), charging is disabled and CHG_AL_N goes into the High-Z state to indicate this. Toggling GOOD_BAT high after the DBP timer expires re-starts detection and the DBP timer.
7.4 Device Functional Modes
The BQ24392-Q1 has three functional modes:
- Nothing inserted
- Accessory inserted and detection running
- Accessory inserted and detected