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PDF NX1A4WP Data sheet ( Hoja de datos )
| Número de pieza | NX1A4WP | |
| Descripción | A4WP compliant high frequency wireless charging receiver front end | |
| Fabricantes | NXP Semiconductors | |
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NX1A4WP
A4WP compliant high frequency wireless charging receiver
front end
Rev. 2 — 4 August 2015
Product short data sheet
1. General description
The NX1A4WP is an A4WP (Alliance for Wireless Power) compliant wireless power
receiver front end. It contains a high-voltage, highly efficient rectifier, integrated LDOs, a
D2C-to-DC converter, a multi-channel 12-bit ADC, four GPIOs and a Fast-Mode I2C-bus
interface. The integrated rectifier supports voltages of up to 20 V and is protected by an
integrated automatic clamping function and an automatic over-power protection function.
The DC-to-DC regulator delivers a nominal voltage of 5 V. The host microcontroller
configures the on-chip controller for automatic interrupt-driven system control.
The controller reads the rectifier output voltage, current level information, junction
temperature and external temperature sensor information from the ADC. It controls the
DC-to-DC converter as well as the GPIOs.
2. Features and benefits
25 V tolerant antenna input pins
Automatic over-voltage protection of the antenna inputs
6.78 MHz compatible integrated rectifier
High efficiency with an active rectifier and a DC-to-DC converter
Integrated LDOs (1.8 V and 3.3 V up to 100 mA) with auto enable and discharge path
Integrated DC-to-DC buck regulator with 5 V, 1.2 A output
Multi-channel 12-bit ADC subsystem
Temperature sensor (NTC) analog interface
USB bus power supply detection
400 kHz I2C-bus slave interface
Software and power-on reset of the on-chip digital controller
Programmable rectifier modes: active, half-active and passive
2 digital General Purpose Input and Output ports (GPIOs) with open-drain outputs and
up to 60 V tolerance for control and communication applications
2 digital General Purpose Input and Output ports (GPIOs) with open-drain outputs and
25 V tolerance for control and communication applications
Protection circuitry
Automatic over-power protection
Automatic AC short to ground for OVP option
Automatic DC-to-DC over-voltage protection lock out option
Over-temperature protection
Over-voltage protection
Under-voltage protection
1 page  
NXP Semiconductors
NX1A4WP
High frequency wireless charging receiver front end
temperature
VO(rect) (LDRECT)
set OTPx flag 125 °C
set OTRx flag 100 °C
set NTCU flag 60 °C
DC/DC
disable
set OVP flag
over-power set OVD flag
protection
20 V
19 V
18 V
17 V
Tth(high)NTC
12 V
6.5 V
AC-clamp
Vovp(en) to GND
Vovp(dis)
over-power
protection
Vovd(en)
Vovd(dis)
max DC/DC
converter range
nominal
range
DC/DC UVLO OFF
maximum
LDO range
set NTCL flag 10 °C
Tth(low)NTC
set BOD flag 5.0 V
DC/DC UVLO ON
INOK bit set 3.8 V
INOK bit clear 3.3 V
LDO UVLO OFF
LDO UVLO ON
Note: temperature protection is not set by default
Fig 3. Diagram of key voltage and temperature limits
aaa-018656
NX1A4WP_SDS
Product short data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 4 August 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
5 of 43
5 Page 
NXP Semiconductors
NX1A4WP
High frequency wireless charging receiver front end
7.3 On-chip over-temperature protection
On-chip temperature sensors are used to monitor the DC-to-DC converter and the active
rectifier for excessive heating. They are intrinsic p-n-junction diode references each
connected to a voltage comparator with their own voltage reference. The OTP1 or OTP2
flags in the status register are set to logic 1 whenever the diode voltage transitions above
the comparator reference voltage (125 C, typically). If this condition occurs, the
DC-to-DC converter can be disabled. The automatic disable mode is enabled when both
the DCTOE bit in the system control register and the corresponding OTPxIE bit in the
ICON register are set to logic 1.
When the temperature drops below 100C (typically), another interrupt is triggered and
the OTRx flag is set to logic 1. It indicates that the device has recovered from the
over-temperature condition and is ready to operate in a safe range again. The OTPx
and/or OTRx flags remain set to logic 1. The microcontroller can clear the flags.
Alternatively, the flags can be cleared by using the automatic clear function
(INTCL = logic 1) and reading the STATL register via the I2C bus.
The OTPx or OTRx flags trigger an interrupt service request (ISR) from the
microcontroller by setting the INT pin to logic 0. The microcontroller can measure the
voltages directly with the ADC. It makes the necessary adjustments either by disabling the
DC-to-DC converter or reducing the power of the transmitter. It can monitor the
temperature until it returns to a lower value before it re-enables the DC-to-DC converter.
7.4 Off-chip NTC over- and under-temperature protection
The NX1A4WP supports one external NTC temperature sensor. A constant and accurate
3.3 V voltage source is supplied from the VREF33 pin. The NTC voltage is input through
the TEMP pin and connected to two voltage comparators. The voltage comparators have
their voltage references Tth(high)NTC typically 60C, and Tth(low)NTC typically 10C.
Whenever the temperature is outside this range, either the NTCU flag or the NTCL flag is
set to logic 1 in the status register. If the corresponding interrupt enable bits are set to
logic 1 in the interrupt control register, the NTCU or NTCL flags trigger an interrupt service
request (ISR) from the microcontroller by setting the INT pin to logic 0. The microcontroller
can trigger an ADC scan cycle and directly measure the output voltage of the NTC
temperature sensor. For details refer to Figure 3, Figure 5 and Figure 8. (See also Table 4
and Section 7.10.4). By setting the DCNTE bit in the SYSCONL register to logic 1, the
DC-to-DC converter is disabled when the upper NTC temperature limit (Tth(high)NTC) is
exceeded.
Refer to Section 7.10.4.4 for further details.
NX1A4WP_SDS
Product short data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 4 August 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
11 of 43
11 Page | ||
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| PDF Descargar | [ Datasheet NX1A4WP.PDF ] | |
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