AS3900 datasheet(55/59 Pages) AMSCO

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AS3900

Data Sheet - Application Information

9 Application Information

The AS3900 is capable to operate with a few external components. The typical application circuit is shown in Figure 27. The system consists of

the AS3900 Block, the MCU and an antenna.

Figure 27. AS3900 Application diagram

9.1 Microcontroller

The integrated link manager takes over a huge workload for the RF communication. The microcontroller takes over the high level communication

like the control of the RF link. The SDI interface of the AS3900 allows connection of a standard 3-wire SPI interface. Only the SEN line needs to

be handled manually by a GPIO. The levels of the I/O lines of the MCU must match with the supply voltage range of the AS3900. Otherwise the

internal overvoltage protection circuit could get activated. As system frequency the MCU_CLK can be used, that reduces the BOM of the MCU.

An external interrupt input at the MCU is necessary in order to control the link manager.

GND

RF1_OUT

RF2_OUT

GND

RF1_IN

RF2_IN

GND

SDATAI

SCLK

SEN

SDATAO

MCU_CLK

IRQ

AS3900

C10

C11

C12

100n

C13

100p

100n

100p

VDD=3V

27.125MHz

12pF

32.768kHz

AS3900 Datasheet(PDF) 55 Page - ams AG