NXQ1TXX5 I2C driver

Platform-independent I2C driver for the NXQ1TXX5 controller IC series for a 5 V Qi-certified/compliant low-power wireless charger. This driver facilitates communication between a microcontroller and the NXQ1TXX5, allowing developers to configure and monitor the IC's functionality easily.

Features

• Charge process ON/OFF control
• Partially possible to get the current device operation
• Digital supply voltage (Vddd) level control
• Supply voltage (Vdd) readings
• Temperature readings from the internal device sensor
• NTC pin voltage readings

Notes

Majority of device parameters are valid only if device is in charge mode (either Qi receiver is placed to the coil or device is in digital ping mode)

Quick start

• Mention the header:

#include "nxq1txx5.h"

• Declare the device handle:

nxq1txx5_t nxq;

• Initialize I2C interface:

I2Cx_Init();

• Provide platform depended implementations for functions below in the nxq1txx5_ifc.c:

/* Blocking */
nxq1txx5_ifc_status_t NXQ1TXX5_I2Cx_Receive(uint8_t regAddress, uint16_t *data);
nxq1txx5_ifc_status_t NXQ1TXX5_I2Cx_Transmit(uint8_t regAddress, uint16_t *data);

/* IT */
nxq1txx5_ifc_status_t NXQ1TXX5_I2Cx_Receive_IT(uint8_t regAddress, uint16_t *data);
nxq1txx5_ifc_status_t NXQ1TXX5_I2Cx_Transmit_IT(uint8_t regAddress, uint16_t *data);

/* DMA */
nxq1txx5_ifc_status_t NXQ1TXX5_I2Cx_Receive_DMA(uint8_t regAddress, uint16_t *data);
nxq1txx5_ifc_status_t NXQ1TXX5_I2Cx_Transmit_DMA(uint8_t regAddress, uint16_t *data);

• Use NXQ1TXX5_Link function to switch between data transfer modes:

/* Blocking */
NXQ1TXX5_Link(&nxq, NXQ1TXX5_I2Cx_Receive, NXQ1TXX5_I2Cx_Transmit);

/* IT */
NXQ1TXX5_Link(&nxq, NXQ1TXX5_I2Cx_Receive_IT, NXQ1TXX5_I2Cx_Transmit_IT);

/* DMA */
NXQ1TXX5_Link(&nxq, NXQ1TXX5_I2Cx_Receive_DMA, NXQ1TXX5_I2Cx_Transmit_DMA);

• Place driver callback in the RX and TX IRQs in case of non-blocking usage:

void I2C_TxCpltCallback()
{
    NXQ1TXX5_Callback(&nxq);
}

void I2C_RxCpltCallback()
{
    NXQ1TXX5_Callback(&nxq);
}

TODO

According to UM11152 it is also possible to request the following parameters from device:

• freq - Operating frequency (Hz) of the charger.
• dut - Duty cycle (%) of the full bridge in; generally, it is at 50 %.
• Icrms - RMS current (mA) through the coil. The calculation of this current is based on the voltage that is measured on pin VSEN.
• ptx - Input power (mW) of the full bridge. It excludes the dissipation in LEDs.
• prx - Received power (mW) that the receiver reports. This power is not the power received in the load, but the power received in the magnetic field.
• ppad - Calculated loss in the charger (mW). ppad = FOD_E * Icrms2 / 1000. When the value of FOD_E is not correct, the calculated loss is wrong.
• pfor - Calculated foreign power (mW). pfor = ptx ? ppad ? prx.
• qidata - <headerid> <data> <checksum>

Examples

• STM32