MSP430BQ1010 www.ti.com SLAS696 – DECEMBER 2010 WIRELESS RECEIVER-SIDE COMMUNICATION AND POWER MONITORING IC FOR WIRELESS POWER Check for Samples: MSP430BQ1010 • • • • • • • • 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 x 5-mm x 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 DESCRIPTION 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 voltageconditioning unit, and a control and communications unit. The MSP430BQ1010 device is the control and communications unit that comprises the digital logic part of the receiver. This unit executes the relevant power-control algorithms and protocols, monitors various voltage and current levels, and provides feedback to the transmitter via the communications modulator. MSP430BQ1010 devices are specifically configured and preprogrammed to be fully compliant with the Wireless Power Consortium standards. The Wireless Power Consortium has developed a standard for wireless charging technology to ensure interoperability between various primary and receiver devices. Wireless Power Consortium (WPC) The consortium is a cooperation of companies, including Texas Instruments, that wants to ensure that the products created are completely interoperable. MSP430BQ1010, as part of the wireless charging receiver solution, complies with the WPC standard. 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCT PREVIEW information concerns products in the formative or design phase of development. Characteristic data and other specifications are design goals. Texas Instruments reserves the right to change or discontinue these products without notice. Copyright © 2010, Texas Instruments Incorporated PRODUCT PREVIEW FEATURES 1 MSP430BQ1010 SLAS696 – DECEMBER 2010 Resonant RX Coil Capacitors www.ti.com Discrete Rectifier IN 20 pF 5-V Output OUT ISET EN1 VDD13 EN2 BQ25046 ISET_SCALE EN1 VIN_DIV EN2 COMM DISABLE_ COMM_ILIM HI LO MSP430BQ1010 PRODUCT PREVIEW Communication Modulator Figure 1. Application Schematic AVAILABLE OPTIONS (1) PACKAGED DEVICES (2) TA PLASTIC 32-PIN QFN (RTV) –40°C to 85°C (1) (2) MSP430BQ1010IRTV For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI web site at www.ti.com. Package drawings, thermal data, and symbolization are available at www.ti.com/packaging. ABSOLUTE MAXIMUM RATINGS (1) Voltage applied at VCC to VSS -0.3 V to + 4.1 V Voltage applied to any pin (2) -0.3 V to (VCC + 0.3 V) Diode current at any device terminal -2 mA to +2 mA Programmed device (3) Storage temperature, TStg Electrostatic discharge (ESD) rating (1) (2) (3) -40°C to 105°C Human-Body Model (HBM) 2000 V Charged-Device Model (CDM) 500 V Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. All voltages referenced to VSS. Higher temperature may be applied during board soldering according to the current JEDEC J-STD-020 specification with peak reflow temperatures not higher than classified on the device label on the shipping boxes or reels. RECOMMENDED OPERATING CONDITIONS MIN VCC Supply voltage during program execution DVCC = VCC VSS Supply voltage DVSS = VSS TA Operating free-air temperature 2 Submit Documentation Feedback TYP MAX UNIT 2.8 3.6 V 0.0 0.0 V -40 85 °C Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): MSP430BQ1010 MSP430BQ1010 www.ti.com SLAS696 – DECEMBER 2010 ELECTRICAL CHARACTERISTICS Current Consumption (1) over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted) VCC TYP UNIT IPeak Peak operating Current PARAMETER 3.3 V TBD µA ITyp Typical operating current 3.3 V TBD µA (1) TEST CONDITIONS All inputs are tied to 0 V or VCC. Outputs do not source or sink any current. Wireless Charging Communication Accuracy over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted) PARAMETER TEST CONDITIONS TA VCC MIN TYP 25°C 3V -1 ±0.2 1 % 0°C to 85°C 3V -2.5 ±0.5 2.5 % 0°C to 85°C 3.6 V TBD TBD % MAX UNIT COMM Timing MAX UNIT Input Characteristics – RST, TERMINATION_ENABLE, WIRELESS_DISABLE, COMM_ILIM_DISABLE PARAMETER TEST CONDITIONS VCC VIT+ Positive-going input threshold voltage VIT- Negative-going input threshold voltage Vhys Input voltage hysteresis (VIT+ - VIT-) 3V Ilkg High-impedance leakage current (1) (2) 3V RPull Pullup/pulldown resistor For pullup: VIN = VSS For pulldown: VIN = VCC CI Input capacitance VIN = VSS or VCC (1) (2) MIN TYP 0.45 VCC 0.75 VCC V 0.25 0.55 V 0.3 20 35 1 V ±50 nA 50 kΩ 5 PRODUCT PREVIEW over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted) pF The leakage current is measured with VSS or VCC applied to the corresponding pin(s), unless otherwise noted. The leakage of the digital port pins is measured individually. The port pin is selected for input and the pullup/pulldown resistor is disabled. Output Characteristics – COMM_DRIVE, BQ25046_EN1, BQ25046_EN2, MIN_LOAD, BQ25046_OUT_ENABLE over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted) PARAMETER VOH High-level output voltage VOL Low-level output voltage (1) (2) VCC MIN I(OHmax) = -1.5 mA (1) TEST CONDITIONS 3V VCC - 0.25 TYP MAX VCC I(OHmax) = -6 mA (2) 3V VCC - 0.6 VCC I(OLmax) = 1.5 mA (1) 3V VSS VSS + 0.25 I(OLmax) = 6 mA (2) 3V VSS VSS + 0.6 UNIT V V The maximum total current, I(OHmax) and I(OLmax), for all outputs combined, should not exceed ±12 mA to hold the maximum voltage drop specified. The maximum total current, I(OHmax) and I(OLmax), for all outputs combined, should not exceed ±48 mA to hold the maximum voltage drop specified. Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): MSP430BQ1010 3 MSP430BQ1010 SLAS696 – DECEMBER 2010 www.ti.com Typical Characteristics – Outputs over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted) TYPICAL LOW-LEVEL OUTPUT CURRENT vs LOW-LEVEL OUTPUT VOLTAGE TYPICAL HIGH-LEVEL OUTPUT CURRENT vs HIGH-LEVEL OUTPUT VOLTAGE 0.0 VCC = 3 V I OH − Typical High-Level Output Current − mA PRODUCT PREVIEW I OL − Typical Low-Level Output Current − mA 50.0 TA = 25°C 40.0 TA = 85°C 30.0 20.0 10.0 0.0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 VCC = 3 V −10.0 −20.0 −30.0 TA = 85°C −40.0 TA = 25°C −50.0 0.0 0.5 VOL − Low-Level Output Voltage − V Figure 2. 4 1.0 1.5 2.0 2.5 3.0 3.5 VOH − High-Level Output Voltage − V Figure 3. Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): MSP430BQ1010 MSP430BQ1010 www.ti.com SLAS696 – DECEMBER 2010 POR/Brownout Reset (BOR) (1) over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted) PARAMETER TEST CONDITIONS VCC MIN TYP MAX UNIT VCC(start) See Figure 4 dVCC/dt ≤ 3 V/s 0.7 × V(B_IT-) V(B_IT–) See Figure 4 through Figure 6 dVCC/dt ≤ 3 V/s 1.35 V Vhys(B_IT–) See Figure 4 dVCC/dt ≤ 3 V/s 140 mV td(BOR) See Figure 4 2000 µs t(reset) Pulse length needed at RST/NMI pin to accept reset internally (1) 2.2 V 2 V µs The current consumption of the brownout module is already included in the ICC current consumption data. The voltage level V(B_IT–) + Vhys(B_IT–)is ≤ 1.8 V. VCC Vhys(B_IT−) V(B_IT−) PRODUCT PREVIEW VCC(start) 1 0 t d(BOR) Figure 4. POR/Brownout Reset (BOR) vs Supply Voltage Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): MSP430BQ1010 5 MSP430BQ1010 SLAS696 – DECEMBER 2010 www.ti.com Typical Characteristics – POR/Brownout Reset (BOR) VCC 3V 2 VCC(drop) − V VCC = 3 V Typical Conditions t pw 1.5 1 VCC(drop) 0.5 0 0.001 1 1000 1 ns t pw − Pulse Width − µs 1 ns t pw − Pulse Width − µs Figure 5. VCC(drop) Level With a Square Voltage Drop to Generate a POR/Brownout Signal VCC 2 t pw 3V PRODUCT PREVIEW VCC(drop) − V VCC = 3 V 1.5 Typical Conditions 1 VCC(drop) 0.5 0 0.001 t f = tr 1 1000 t pw − Pulse Width − µs tf tr t pw − Pulse Width − µs Figure 6. VCC(drop) Level With a Triangle Voltage Drop to Generate a POR/Brownout Signal 6 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): MSP430BQ1010 MSP430BQ1010 www.ti.com SLAS696 – DECEMBER 2010 Analog Inputs: VIN_DIV, ISET_SENSE, ADAPTER_DETECT, ISET_SCALE (1) (2) over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted) PARAMETER VCC TEST CONDITIONS ADC supply voltage range (3) VAx Analog input voltage range Rs Source impedance on input channel (1) (2) (3) VCC MIN VSS = 0 V 3V TYP MAX 2.8 3.6 0 VCC 3V UNIT V V 20 kΩ The leakage current is defined in the leakage current table with the Input Characteristics parameters. The internal reference current is supplied via terminal VCC. The analog input voltage range must be within the selected reference voltage range 0 V to 2.5 V for valid conversion results. 10-Bit ADC, Built-In Voltage Reference over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted) VCC MIN TYP MAX VREF+ Positive built-in 2.5-V reference PARAMETER TEST CONDITIONS 3V 2.35 2.5 2.85 V TCREF+ Temperature coefficient (1) 3V ±100 ppm/°C VREF with calibration data applied – VIN_DIV and ISET_SCALE TBD Calculated using the box method: ((MAX(VREF(T)) × MIN(VREF(T))) / MIN(VREF(T)) / (TMAX – TMIN) PRODUCT PREVIEW (1) UNIT 10-Bit ADC, Linearity Parameters over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted) MAX UNIT EI Integral linearity error PARAMETER TEST CONDITIONS VCC 3V MIN TYP ±1 LSB ED Differential linearity error 3V ±1 LSB EO Offset error Source impedance RS < 100 Ω 3V ±1 LSB EG Gain error Unbuffered external reference, VeREF+ = 2.5 V 3V ±1.1 ±2 LSB ET Total unadjusted error Unbuffered external reference, VeREF+ = 2.5 V 3V ±2 ±5 LSB UNIT MSP430BQ1010 Thresholds over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted) PARAMETER VAC-DET-LO-THRESHOLD VAC-DET-HI-THRESHOLD TEST CONDITIONS VCC = 3 V VCC = 3 V VADAPTER-DETECT-THRESHOLD Large error threshold MIN TYP MAX 0.23 0.24 VCC 0.25 VCC 0.69 0.72 0.75 0.47 0.48 VCC 0.5 VCC 1.41 1.44 1.5 0.5 BQ25046_EN1 = 1, BQ25046_EN2 = 1 5 BQ25046_EN1 = 1, BQ25046_EN2 = 0 20 VOVER-CURRENT-THRESHOLD (1) V V V % 1.35 V VISET-SCALE-MIN-LOAD-LO-THRESHOLD 68.36 mV VISET-SCALE-MIN-LOAD-HI-THRESHOLD 134.27 mV VISET-SCALE-TERM-LO-THRESHOLD 75.68 mV VISET-SCALE-TERM-HI-THRESHOLD 144 mV VISET-SCALE-COMM-ILIM-THRESHOLD 0.98 V (1) See the bq25046 datasheet (SLUSA83) for the transimpedance gain. Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): MSP430BQ1010 7 MSP430BQ1010 SLAS696 – DECEMBER 2010 www.ti.com NC DVCC RESERVED NC COMM_ILIM_DISABLE TERMINATION_ENABLE BQ25046_OUT_ENABLE 32 31 30 29 28 27 26 25 DVSS 1 24 NC AC_DETECT 2 23 NC COMM_DRIVE 3 22 WIRELESS_DISABLE NC 4 21 RESERVED RST 5 20 NC VIN_DIV 6 19 NC ISET_SENSE 7 18 ISET_SCALE Reserved 8 17 NC RTV PACKAGE 9 10 11 12 13 14 15 16 NC BQ25046_EN1 BQ25046_EN2 NC NC NC MIN_LOAD (TOP VIEW) ADAPTER_DETECT PRODUCT PREVIEW 8 NC DEVICE INFORMATION Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): MSP430BQ1010 MSP430BQ1010 www.ti.com SLAS696 – DECEMBER 2010 TERMINAL FUNCTIONS DVSS NO. I/O 1 - - Supply voltage (GND connection) AC_DETECT DESCRIPTION 2 I A Analog input voltage that is used to detect the presence of wireless power transmission. AC_DETECT is the voltage at the AC2 switching node in the EVM schematic [see bq25046EVM-687 User’s Guide (SLVU420)]. If the wireless power transmission is not present during the MSP430BQ1010 power-up routine, the device is reset. 3 O D Communication control. Communicates with the wireless transmitter by varying the reflected impedance. NC 4 - - Connect to VSS RST 5 I D Device reset 6 I A Analog input voltage that represents 6:1 divided rectifier output voltage. See bq25046EVM-687 User’s Guide (SLVU420) for more details on the 6:1 divider. 7 I A Analog input voltage for overcurrent detection. When the ISET_SENSE voltage exceeds the overcurrent threshold, the MSP430BQ1010 disables the BQ25046 output and sends an end power transfer packet, message 0x05. 8 - - Reserved. Connect to VSS. COMM_DRIVE VIN_DIV ISET_SENSE Reserved (VSS) ADAPTER_DETECT 9 I A External adapter voltage measurement. External adapter refers to another host charging the battery. Use a 6:1 divider from the adapter voltage. When the ADAPTER_DETECT voltage exceeds the VADAPTER-DETECT threshold, the MSP430BQ1010 disables the BQ25046 output and sends an end power transfer packet, message 0x01. 10 - - Connect to VSS 11 O D BQ25046 current limit configuration pins. See the EN1 and EN2 Input table in the BQ25046 datasheet (SLUSA83). BQ25046_EN2 12 O D NC 13 - - Connect to VSS NC 14 - - Connect to VSS NC 15 - - Connect to VSS NC BQ25046_EN1 MIN_LOAD NC 16 O D Provides additional load during minimum-load conditions to improve the stability of the wireless control loop. When a minimum-load condition is detected (that is, when the BQ25046 output current is less than VISET_SCALE_MINLOAD_LO_THRESHOLD) the MIN_LOAD pin is set high. When the output current exceeds VISET_SCALE_MIN-LOAD_HI_THRESHOLD, the pin is reset. 17 - - Connect to VSS ISET_SCALE 18 I A Analog input voltage that represents BQ25046 output current. Connect a 470-Ω resistor between this pin and ground. This pin can be tied directly to the ISET pin on the BQ25046 to achieve a output current limit of VOVER_CURRENT_THRESHOLD. If a lower BQ25046 current limit is desired, a second resistor can be connected from this pin to the ISET pin on the BQ25046. The transimpedance gain at this pin is 1.31 V/A. See the bq25046EVM-687 User’s Guide (SLVU420) for more details on choosing values for the BQ25046 ISET resistor. NC 19 - - Connect to VSS NC 20 - - Connect to VSS Reserved (DVCC) 21 I D Reserved. Connect to DVCC. 22 I D Connecting this pin to DVCC disables wireless power transfer. When WIRELESS_DISABLE is pulled to DVCC, the MSP430BQ1010 disables the BQ25046 output and sends an end power transfer packet, message 0x03. NC 23 - - Connect to VSS NC 24 - - Connect to VSS D Enables the wireless charging path. The wireless charging output is combined by a logical OR with the ADAPTER_DETECT function. During the MSP430BQ1010 power-up routine, this pin is set high to enable the BQ25046 output, only if no external adapter is detected. WIRELESS_DISABLE BQ25046_OUT_ENABLE 25 O Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): MSP430BQ1010 9 PRODUCT PREVIEW NAME TYPE (A/D) MSP430BQ1010 SLAS696 – DECEMBER 2010 www.ti.com TERMINAL FUNCTIONS (continued) NAME NO. I/O TYPE (A/D) DESCRIPTION D User configurable pin that enables the power-supply termination feature on the MSP430BQ1010. Pulling this pin high enables the termination detect function on MSP430BQ1010 which sends an end power transfer packet, message 0x01, to the transmitter 5 seconds or 3 minutes after the BQ25046 output current has dropped below VISET_SCALE_TERM_LO_THRESHOLD or VISET_SCALE_TERM_HI_THRESHOLD thresholds respectively. TERMINATION_ENABLE 26 I COMM_ILIM_DISABLE 27 I D User configurable pin that is used to enable/disable BQ25046 current limit modes during communication. With COMM_ILIM_DISABLE connected to DVSS, current limit during communication is enabled, and with COMM_ILIM_DISABLE connected to DVCC, current limit during communication is disabled. NC 28 - - Connect to VSS Reserved (VSS/floating) 29 - - Reserved. Can be either connected to VSS or left floating DVCC 30 - - Supply voltage (VCC) NC 31 - - Connect to VSS NC 32 - - Connect to VSS - - - Connection to DVSS is recommended. QFN Pad PRODUCT PREVIEW 10 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): MSP430BQ1010 MSP430BQ1010 www.ti.com SLAS696 – DECEMBER 2010 Block Diagram AC_DETECT Software Reset VCC/4 VCC/2 MIN_LOAD Min_Load Detect COMM_ILIM_ DISABLE ISET_ SCALE A/D COMM_DRIVE Control Error and Power Packet Calculation A/D Term Detect Comm and BQ25046 BQ25046_EN1 EN1/EN2 Control BQ25046_EN2 PRODUCT PREVIEW VIN_DIV 5-s Delay 180-s Delay TERM_EN ISET_SNS A/D OverCurrent Detect EPT WIRELESS_DISABLE ADAPTER_ IN_DIV A/D Adapter Detect BQ25046_OUT_EN Figure 7. Simplified Functional Block Diagram Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): MSP430BQ1010 11 MSP430BQ1010 SLAS696 – DECEMBER 2010 www.ti.com DETAILED FUNCTIONAL DESCRIPTION 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). Table 1 shows packet information for each of the power-up routine packets. Table 1. Power-Up Routine Packets HEADER PACKET TYPE MSG SIZE MESSAGE 0x01 Signal Strength 1 Byte0 Unsigned byte representation of the voltage measured at the VIN_DIV pin 0x71 Identification 7 Byte0 Major Version and Minor Version (0x10) Byte1 Byte2 Byte3 Manufacturer Code (0x0010) Byte4 Byte5 0x51 Configuration 5 Byte6 Unique Device ID Byte0 Power Class and Max Power (0x0A) Byte1 PRODUCT PREVIEW Byte2 Byte3 Byte4 Reserved (0x0) 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. Along with the control error packet, a power packet (see Table 2) that represents the received power or the actual power is sent to the transmitter every 4 seconds during the main loop routine. The control error and the actual power messages are calculated by the Control Error Packet and Power Packet generator block. Table 2. Power Packet Contents HEADER PACKET TYPE MSG SIZE MESSAGE 0x03 Control Error 1 Byte0 Signed byte representation of the percentage difference between the desired and actual rectifier output voltage (measured at VIN_DIV). 0x04 Received Power 1 Byte0 Unsigned byte representation of percentage received power with respect to 5 W = (VIN_DIV × ISET_SCALE) × 100 / 5 W During the main loop routine, various protection features such as minimum load detect, overcurrent detect, wireless disable, and termination detect are enabled. Appropriate actions are taken when any one of these conditions is detected. 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. On device power-up, if the voltage at AC_DETECT pin is less than VAC-DET-HI-THRESHOLD, the device waits until this voltage rises above VAC-DET-HI-THRESHOLD to proceed with the rest of the power-up routine. If the voltage at AC_DETECT pin later falls below VAC-DET-LO-THRESHOLD during the power-up routine, the device is reset and the execution goes back to comparing the voltage at AC_DETECT pin against VAC-DET-HI-THRESHOLD. 12 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): MSP430BQ1010 MSP430BQ1010 www.ti.com SLAS696 – DECEMBER 2010 Adapter Detect This block detects if there is an external adapter present in the system and turns off the wireless power. The external adapter voltage should be connected to the ADAPTER_DETECT pin through a 6:1 resistor divider. When voltage at ADAPTER DETECT pin exceeds VADAPTER-DETECT-THRESHOLD, an external adapter in the system is detected and an end power packet (message 0x01) is sent to the transmitter. This causes the transmitter to turn off the wireless power. The adapter detect feature is enabled initially in the power-up routine where the BQ25046_OUT_ENABLE pin is set if no external adapter is detected. This feature is always enabled in the main loop 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. Hysteresis is implemented by setting MIN_LOAD high when voltage at ISET_SCALE drops below VISETSCALE-MIN-LOAD-LO-THRESHOLD and setting MIN_LOAD low only when voltage at ISET_SCALE rises above VISETSCALE-MIN-LOAD-HI-THRESHOLD. The Min Load Detect feature is enabled after the power-up routine. This block is enabled in the main loop routine only if the TERMINATION_ENABLE pin is externally pulled high (to DVCC). The termination condition is detected if the BQ25046 output current, measured at ISET_SCALE pin, drops below either VISET_SCALE_TERM_HI_THRESHOLD or VISET_SCALE_TERM_LO_THRESHOLD threshold. On detecting a valid termination condition, an end power transfer packet (message 0x01) is sent to the transmitter either after 3 minutes or 5 seconds, depending on if the voltage at ISET_SCALE dropped below VISET_SCALE_TERM_HI_THRESHOLD or VISET_SCALE_TERM_LO_THRESHOLD threshold, respectively. Overcurrent Detect This block detects an overcurrent condition when the analog voltage at ISET_SENSE (with a 470-Ω resistor connected between this pin and ground), which represents the BQ25046 output current, exceeds the VOVER_CURRENT_THRESHOLD. If a lower BQ25046 current limit is desired, a second resistor can be connected from this pin to the ISET pin on the BQ25046. The transimpedance gain at this pin is 1.31 V/A. On detecting an overcurrent condition, an end power transfer packet (message 0x05) is sent to the transmitter, and the transmitter turns off the wireless power. This feature is always enabled in the main loop routine. 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 (message 0x03) is sent to the transmitter, and the transmitter turns off the wireless power. Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): MSP430BQ1010 13 PRODUCT PREVIEW Termination Detect MSP430BQ1010 SLAS696 – DECEMBER 2010 www.ti.com EPT Generator This block generates end power transfer packets with appropriate messages that are sent to the transmitter. Table 3 shows packet information for the end power transfer packet. Table 3. EPT Packet HEADER 0x02 PACKET TYPE MSG SIZE End power transfer 1 MESSAGE Byte0 See Table 4 On receiving the end power transfer packet, the transmitter removes the power signal within tterminate ms. Table 4 shows the various error messages sent during different conditions. Table 4. EPT Error Messages EPT CONDITION EPT MESSAGE Overcurrent detect 0x05 Adapter detect 0x01 Termination detect 0x01 Wireless disable 0x03 PRODUCT PREVIEW NOTE End power transfer can be the first packet that is sent to the transmitter if an external adapter is detected during the power-up routine. Control Error Packet and Power Packet Generator This block computes the control error and actual power for the control error packet and power packet messages respectively. The control error is calculated as a percentage difference between the rectifier voltage measured at VIN_DIV and the target or desired rectifier voltage (see Equation 1). ControlError = 100 × Vdesired – Vrect Vdesired (1) Where, Vrect is the rectifier voltage that is measured VIN_DIV input pin. Vdesired is the desired rectifier voltage that is dynamically selected depending on the BQ25046 output current that is measured at the ISET_SCALE input pin. The control error packet is transmitted every 32 ms or 250 ms depending on if the control error calculated was a large error or a small error, respectively. Control error is identified as a large error if the percentage difference is greater than 5% when the BQ25046 charge is not enabled (that is, BQ25046_EN1 = 1 BQ25046_EN2 = 1) or greater than 20% when the BQ25046 charge is enabled (that is, BQ25046_EN1 = 1 BQ25046_EN2 = 0). The maximum control error percentage is saturated to ±30%. The actual power is calculated as a percentage relative to 5 W (see Equation 2). The maximum power that can be sent is 100%. Actual Power = 100 × Vrect × IOUT % 5W (2) Where, Vrect is the rectifier voltage that is measured VIN_DIV input pin. IOUT is the BQ25046 current output that is measured at the ISET_SCALE pin. 14 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): MSP430BQ1010 MSP430BQ1010 www.ti.com SLAS696 – DECEMBER 2010 COMM and BQ25046 Current Mode Controller This block receives the control error, actual power, and end power transfer packets from the control error packet and power packet generator block and from the EPT generator block. It performs the WPC-compliant bit, byte, and packet encoding that is required to transmit the packet information over the COMM_DRIVE pin. This block also controls the BQ25046 current modes via the BQ25046_EN1 and BQ25046_EN2 pins. During the power-up routine, the BQ25046_EN1 and BQ25046_EN2 pins are set high and the BQ25046 is turned off. In the main loop routine, the BQ25046 is turned on only when a large negative control error (that is, the control error greater than -5% with BQ25046_EN1= BQ25046_EN2 =1) is detected for four consecutive iterations or a small control error (that is, the control error is less than ±5%) is detected the first time. Depending on the status of the user-configurable COMM_ILIM_DISABLE pin, the current limit of the BQ25046 is enabled or disabled during communication. See the BQ25046 Current Limit During Communication section for more details regarding the COMM_ILIM_DISABLE pin and enabling current limit on BQ25046 during communication. BQ25046 Current Limit During Communication This feature enables or disables the current limit on the BQ25046 during communication via the COMM_ILIM_DISABLE pin. With COMM_ILIM_DISABLE pin externally pulled low (to VSS), the current limit on BQ25046 is enabled during communication. Depending on if the BQ25046 output current, measured at ISET_SCALE, is greater than or less than VISET-SCALE-COMM-ILIM-THRESHOLD, the 500-mA (BQ25046_EN1 = 0 and BQ25046_EN2 =1 ) or 100-mA (BQ25046_EN1 = 0 and BQ25046_EN2 = 0) current limit modes of BQ25046 are selected, respectively. With the COMM_ILIM_DISABLE pin pulled low, the current limit mode of the BQ25046 is selected only during communication; once the communication is complete, the BQ25046 is configured in the ISET mode with BQ25046_EN1 = 1 and BQ25046_EN2 =0. This feature is enabled only when the BQ25046 is turned ON. Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): MSP430BQ1010 15 PRODUCT PREVIEW With the COMM_ILIM_DISABLE pin externally pulled high (to DVCC), the current limit on the BQ25046 during communication is disabled; that is, the MSP430BQ1010 does not change the BQ25046 current mode during communication. MSP430BQ1010 SLAS696 – DECEMBER 2010 www.ti.com APPLICATION INFORMATION General Overview of a Wireless Power System Figure 8 shows a block diagram of a wireless power system, which consists of a transmitter and receiver. The transmitter consists of an ac-dc power stage, followed by a transmitter coil driver, coil voltage, and coil current sensing block, and a wireless power controller (BQ500110). The receiver consists of a receiver coil, rectifier, BQ25046 voltage regulation circuit, and MSP430BQ1010 wireless power controller. The output of the system is the BQ25046 5-V regulated output voltage that is used as a power supply to the charger in a cellular phone or other mobile device. The system shown in Figure 8 implements wireless power transfer via inductive coupling between the transmitter and receiver. In this system, the transmitter drives a transmit coil with a frequency between 100 and 200 kHz, and the receiver coil, which is in close proximity to the transmitter coil, rectifies the received voltage to power the BQ25046. In addition, the receiver continuously monitors its operating point (coil voltage and coil current) and communicates correction packets to the transmitter via backscatter modulation. Power AC to DC Drivers Rectification Voltage Conditioning Communication PRODUCT PREVIEW Controller V/I Sense Load (Battery or Phone) bq2504x Controller MSP430 bq50k Transmitter Receiver Figure 8. Wireless Power System Using MSP430BQ1010 in a Wireless Power System Figure 9 shows the MSP430BQ1010 used in a wireless power receiver solution. In this application, a receiver coil connects to a half-synchronous rectifier that includes a rectifier filter capacitor. The rectifier voltage is connected directly to the IN pin of the BQ25046, and the BQ25046 generates a 3.3-V LDO output that is used to power the MSP430BQ1010 wireless power supply controller. The MSP430BQ1010 monitors the rectifier voltage and output current and communicates to the transmitter via the communication modulator to optimize the power delivered to a mobile device. The OUT pin of the BQ25046 delivers 5-V to a mobile device at power levels up to 5 W. 16 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): MSP430BQ1010 MSP430BQ1010 www.ti.com Resonant RX Coil Capacitors SLAS696 – DECEMBER 2010 Discrete Rectifier IN 20 pF 5-V Output OUT ISET EN1 VDD13 EN2 BQ25046 ISET_SCALE EN1 VIN_DIV EN2 COMM DISABLE_ COMM_ILIM HI LO PRODUCT PREVIEW MSP430BQ1010 Communication Modulator Figure 9. MSP430BQ1010 in a Wireless Power Receiver Selection of Components See the bq25046EVM-687 User’s Guide (SLVU420) for suggested component values. Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): MSP430BQ1010 17 PACKAGE OPTION ADDENDUM www.ti.com 20-Dec-2010 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Qty Eco Plan (2) Lead/ Ball Finish MSL Peak Temp (3) Samples (Requires Login) MSP430BQ1010IRTVR ACTIVE QFN RTV 32 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR Purchase Samples MSP430BQ1010IRTVT ACTIVE QFN RTV 32 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR Purchase Samples (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. 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Addendum-Page 1 PACKAGE MATERIALS INFORMATION www.ti.com 9-Dec-2010 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant MSP430BQ1010IRTVR QFN RTV 32 3000 330.0 12.4 5.3 5.3 1.5 8.0 12.0 Q2 MSP430BQ1010IRTVT QFN RTV 32 250 180.0 12.4 5.3 5.3 1.5 8.0 12.0 Q2 Pack Materials-Page 1 PACKAGE MATERIALS INFORMATION www.ti.com 9-Dec-2010 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) MSP430BQ1010IRTVR QFN RTV 32 3000 346.0 346.0 29.0 MSP430BQ1010IRTVT QFN RTV 32 250 190.5 212.7 31.8 Pack Materials-Page 2 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. 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