BQ500414Q Datasheet, PDF (10/34 Pages) Texas Instruments – Qi Compliant Wireless Power Transmitter Manager

bq500414Q
SLUSBE4B – JANUARY 2014 – REVISED JUNE 2014
www.ti.com
8.3 Feature Description
8.3.1 A6 Coil Specification
bq500414Q supports WPC A6 transmitter type. The coil and matching capacitor specification for the A6
transmitter has been established by WPC standard. This is fixed and cannot be changed on the transmitter side.
The bq500414Q is primarily intended to drive a 3 coil array but it can also be used to drive a single coil or two
coils. For single coil operation, the other coils and associated electronics are simply omitted.
Schematics and BOM can be found on the product folder at www.ti.com.
For a current list of coil vendors please see:
• bqTESLA Transmitter Coil Vendors, SLUA649
8.3.2 EMI Shield
TI recommends using a PCB based Electromagnetic Interference (EMI) shield to improve the EMI performance.
The shield needs to be grounded. Pin 21 is used to indicate if EMI shield is in use. See product folder at
www.ti.com for additional information on reference designs and applications.
8.3.3 I²C Interface
The bq500414Q supports read and write commands via I²C, as well as firmware upgrade. This could help the
host controller monitor system information, control output power, and temporarily shift the Tx operating
frequency.
The slave address assigned to the bq500414Q has been hardcoded to 20 (decimal). The hardware can support
100-kHz, 400-kHz, or 1-MHz I²C operation. Contact Texas Instruments for additional information on I²C interface.
8.3.4 Active or Passive Wake-up State
At power up, the bq500414Q will read EN_PWR pin voltage. If it is low, the bq500414Q device will be in active
wake-up state. It will send a analog ping to detect if a compatible Rx is present and then sends a digital ping to
power up the Rx. If the EN_PWR pin voltage is high, the bq500414Q will be in a passive wake-up state and
considers that the SHUTDOWN command is issued. It will not send any analog ping or digital ping to detect the
presence Rx, until the SHUTDOWN command is disabled through I²C. Once the SHUTDOWN command is
disabled, the bq500414Q device will be in active wake-up state and send the analog ping to detect the Rx. At the
same time, it drives EN_PWR pin LOW to enable the SEPIC converter. This feature enables the use of a
customer defined proximity sensor.
8.3.5 Smart Key or Immobilizer Handling
The host controller may temporarily shift the bq500414Q operating frequency via I²C, when a smart key or an
immobilizer is being used to avoid the interference.
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