NXQ1TXA5_SDS Datasheet, PDF (5/15 Pages) NXP Semiconductors – One-chip 5 V Qi wireless transmitter

NXP Semiconductors
NXQ1TXA5
One-chip 5 V Qi wireless transmitter
Table 4. Pin description^[1] …continued
Symbol Pin Type Description
VDDP2 15, 16 P power supply pin 2
OUT2
17, 18 O transmitter output 2
GNDP^[1]
19, 20, P
21, 22
power ground
OUT1
23, 24 O transmitter output 1
VDDP1 25, 26 P power supply pin 1
GNDD^[1] 27
P
digital ground
CDEC
28
P
decoupling connection for internal LDO
XTAL_IN 29
I
crystal input
XTAL_OUT 30
O crystal output
TEST
31
I/O test pin; connect to ground
NFC_DIS 32
O NFC disable function
[1] For enhanced thermal and electrical performance, the exposed die-pad, and pins GNDP. GNDD must be
connected to top layer board ground. The exposed die-pad must also be connected to bottom layer board
ground with plated-through vias (see Section 12.4).
8. Functional description
8.1 Device operation
The NXQ1TXA5 is a 5 V wireless charger with an integrated full-bridge power stage. It
integrates all the functions required to control the power transfer between a
WPC-compliant Qi transmitter and a WPC-compliant Qi receiver efficiently. It can deliver
up to 8 W continuous power into the WPC-compliant Qi type A5, A11, A12 or A16
transmitter coil.
A block diagram of the NXQ1TXA5 is shown in Figure 1. It is operational when a 5 V
supply is connected and pin STBY is LOW. Internal 1.8 V biasing is activated and the
NXQ1TXA5 starts checking for a device on the transmitter base station. Power
consumption is extremely low (typically 10 mW) during this phase. When a device is
detected, the low-power DSP core starts up and sets up communications with the
detected device. Power transfer is initiated if the device is identified as a WPC-compliant
Qi receiver. The NXQ1TXA5 ensures that the correct power transfer level is maintained
with frequency and duty cycle control according to the WPC Qi specifications.
The power transfer can be monitored via the LED and BUZZER outputs. The external
temperature can be monitored via the NTC input to protect the application from
overheating when charging Qi-V1.0 receivers that do not support Foreign Object
Detection (FOD).
Additional inputs are provided to select the LED mode, configure FOD according to the
application design and coil/capacitor selection, set the SPR level and enable/disable SPL.
NXQ1TXA5_SDS
Product short data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1.2 — 10 September 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
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