MSP430BQ1010 is an advanced fixed-function device that forms the control and communications unit on the receiver side for wireless power transfer in portable applications. MSP430BQ1010 complies with the Wireless Power Consortium (WPC) specification. Together with a WPC-compliant transmitter-side controller, a complete wireless power system is enabled.
In a wireless power solution, power is transferred from the transmitter coil in the charging pad to the receiver coil embedded in the portable device, based on near-field magnetic induction. Feedback information from the receiver is transmitted back to the transmitter via changes in the reflected impedance of the receiver device.
The receiver side on the mobile/portable device consists of a rectification circuit, a voltage-conditioning unit, and a control and communications unit.
Features
- Enables Wireless Power Solution
- Communication and Voltage/Current Monitoring
- WPC-Compliant Communication Protocol
- Unique Device ID
- Supports TI’s BQ25046
- Optional Battery Power Transfer Termination
- Fixed-Function Device – No Software Development Required
- 5-mm × 5-mm × 0.75-mm 32-Pin RTV (QFN) Package
- APPLICATIONS
- Low-Power (<5 W) Portable Devices Powered by Lithium-Ion Batteries Including:
- Cell Phones, Smart Phones
- Headsets
- PDAs
- Portable Media Players
- Other Hand-Held Devices
- Low-Power (<5 W) Portable Devices Powered by Lithium-Ion Batteries Including:
MSP430BQ1010 Block diagram
The MSP430BQ1010 operation can be classified into two main routines: power-up routine and main loop routine. On power-up, the MSP430BQ1010 executes the power-up routine, which enables the AC Detect, initial Adapter Detect check, and transmits signal strength, ID, and configuration packets to the transmitter (in the same sequence).
Once the power-up routine is completed, the device enters the main loop routine. In the main loop routine, the analog inputs are sampled every 32 ms and the control error packet is transmitted every 32 ms or 250 ms, depending on whether the error calculated was a large error or a small error, respectively. Control error is the percentage difference between the desired and actual rectifier output voltage that is sent to the transmitter by the receiver to adjust the transmitter coil current.
AC Detect
This block detects the presence of a wireless power signal during the power-up routine of MSP430BQ1010. This feature is always enabled during the power-up routine.
Minimum Load Detect
This block detects if the BQ25046 current (measured at ISET_SCALE) drops below a certain threshold and turns on the additional load in the system, required to maintain stability in the system, by setting the MIN_LOAD pin high.
Wireless Disable
This block is always enabled in the main loop routine. On externally pulling the WIRELESS_DISABLE input pin high (to DVCC), an end power transfer packet is sent to the transmitter, and the transmitter turns off the wireless power.
bq25046: 1.1A, Single-Input 5-V Power Supply IC for Contactless Charging Applications
The bq25046 is a highly integrated linear power supply IC targeted at both wired and wireless power applications. With an accurate 5-V regulated output and integrated 3.3-V LDO, the bq25046 is an ideal solution for wireless power supply solutions up to 5 W.
The bq25046 integrates several functions which enable a wireless charging solution within a small area and low component count. These include a 3.3-V LDO which drives an MSP430BQ1010 wireless controller, high-accuracy current sense for calculating receiver-side power usage, 100mA/400mA current limits enable robust communication at all load current levels, and integrated pass FET acts as load disconnect switch and 5-V regulator to protect downstream circuitry.
Features
- 30V Input Rating, with 15V Over-Voltage Protection (OVP) Threshold
- Integrated Charge Current Sense for Wireless Power Transfer Efficiency Monitoring
- 3.3V, 15mA integrated Low Dropout Linear Regulator (VDD3.3) Supplies Power to MSP430BQ1010 Directly
- 2% Output Voltage Regulation
- Pin Selectable 100mA and 400mA Current Limit Enables Robust Communication in Wireless Power Systems at any Output Current Level
- Soft-Start Feature to Reduce Inrush Current
- Status Indication – Power Good (PG) and Output Enabled (CHG)
- Available in Small 2mm × 3mm DFN-10 Package
- APPLICATIONS
- Wireless Power Applications
- Smart Phones
- PDAs
- MP3 Players
- Low-Power Handheld Devices
bq25046 Block Diagram
TYPICAL APPLICATION CIRCUIT
