FAQ: What are the differences between AX5043 and AX5243?

The AX5243 is a miniaturized version of the AX5043.

The AX5043 comes in a QFN28 5x5 mm2 package, while the AX5243 comes in a QFN20 4x4 mm2, thus enclosing the same RF performance of the AX5043 in a 35% smaller package.

In order to fit the silicon chip in the AX5243 smaller package, some of the peripherals are not pinned out such as (differences highlighted in yellow):

  • ANTP1: single ended output of the transmitter Power Amplifier.
  • DATA and DCLK: general purpose I/O also connected to the encoder block allowing for Wire Mode, wired bidirectional communication via the data (DATA) and clock (DCLK) lines.
  • ANTSEL: general purpose I/O that can be used to control an external power amplifier.

Another difference is the naming of PWRAMP (pin 20 of AX5043) and TCXO_EN (pin 15 of AX5243) which are labelled differently, but are the same GPIO pad on the silicon.
In particular:

  • The AX5043 has five available GPIOs: DATA, DCLK, SYSCLK, IRQ, ANTSEL, PWRAMP. They can be used as general purpose I/O pins by programming pin configuration registers PINFUNCSYSCLK, PINFUNCDCLK, PINFUNCDATA, PINFUNCIRQ, PINFUNCNANTSEL, PINFUNCPWRAMP.

  • The AX5243 has three available GPIOs: SYSCLK, IRQ, TCXO_EN (a.k.a PWRAMP). They can be used as general purpose I/O pins by programming pin configuration registers PINFUNCSYSCLK, PINFUNCIRQ, PINFUNCPWRAMP.

More information on these devices can be found in the datasheets:

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