AX8052F131 datasheet(24/29 Pages) ONSEMI

24 / 29 page

AX8052F131

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APPLICATION INFORMATION

Typical Application Diagrams

Connecting to Debug Adapter

Figure 9. Typical Application Diagram with Connection to the Debug Adapter

CLK16P

CLK16N

VDDA

GND

ANTP

ANTN

GND

DBG_EN

PB7

PB4

VDDA

PB3

AX8052F131

100pF

4.7uF

DBG_EN

DBG_RT_N

GND

DBG_CLK

DBG_DATA

GND

DBG_VDD

Jumper JP1

32 kHz XTAL

Debug adapter

connector

1uF

16 MHz

XTAL

Short Jumper JP1−1 if it is desired to supply the target

board from the Debug Adapter (50 mA max). Connect the

bottom exposed pad of the AX8052F131 to ground.

If the debugger is not running, PB6 and PB7 are not driven

by the Debug Adapter. If the debugger is running, the PB6

and PB7 values that the software reads may be set using the

Pin Emulation feature of the debugger.

PB3 is driven by the debugger only to bring the

AX8052F131 out of Deep Sleep. It is high impedance

otherwise.

The 32 kHz crystal is optional, the fast crystal at pins

CLK16N and CLK16P is used as reference frequency for the

RF RX/TX. Crystal load capacitances should be chosen

according to the crystal’s datasheet. At pins CLK16N and

CLK16P they the internal programmable capacitors may be

used, at pins PA3 and PA4 capacitors must be connected

externally.

It is mandatory to add 1

mF (low ESR) between VREG and

GND. Decoupling capacitors are not all drawn. It is

recommended to add 100 nF decoupling capacitor for every

VDDA and VDD_IO pin. In order to reduce noise on the

antenna inputs it is recommended to add 27 pF on the VDD

pins close to the antenna interface.

The AX8052F131 has an integrated voltage regulator for

the analog supply voltages, which generates a stable supply

voltage VREG from the voltage applied at VDD_IO. Use

VREG to supply all the VDDA supply pins and also to DC

power to the pins ANTP and ANTN.

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