BQ500414Q Datasheet, PDF (21/34 Pages) Texas Instruments – Qi Compliant Wireless Power Transmitter Manager

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bq500414Q
SLUSBE4B – JANUARY 2014 – REVISED JUNE 2014
Typical Application (continued)
9.2.1.5 Input Power Requirements
The design works with 6-V to 16-V input voltage. A6 Tx type requires 12-V system voltage. A SEPIC converter
TPS40210 is included in the design to work with 6-V to 16-V input voltage for automotive application.
9.2.2 Detailed Design Procedure
To begin the design process a few parameters must be decided upon. The design needs to know the following:
• Active or Passive Wake-up State
• EMI Shield
• LED Mode
• Number of Tx coils (1, 2, or 3)
9.2.2.1 Active or Passive Wake-up State
bq500414Q detects the pin 18 ~EN_PWR voltage at power up. If it's high, the bq500414Q will not send any
analog ping to detect the Rx, until SHUTDOWN command is disabled through I²C. A proximity sensor could be
used with this feature.
9.2.2.2 EMI Shield
EMI shield can help improve EMI performance. Pin 21 EMI_SHIELD is used to indicate if EMI shield is in use.
9.2.2.3 LED mode
bq500414Q can directly drive three LED outputs (pin 7 LED_A, pin 8 LED_B, and pin 9 LED_C). Select one of
the desired LED indication schemes by choosing the selection resistor connected between pin 44 LED_MODE
and GND.
9.2.2.4 Number of Transmitter Coils
bq500414Q supports 1, 2, or 3 coils. Please refer to the product folder on www.ti.com for more information on
the 3-coil design.
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