ams AG AS3932 Примітка до заявки - Сторінка 5

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Application Note AS3932 - Migration from ATA5283 (1-channel) to AS3932

Figure 2-3: Alternative application diagram of AS3932.

2.2

Oscillator frequency

The ATA5283 has no Real Time Clock (RTC), while the AS3932 has a RTC that either uses a crystal oscillator or

the fully integrated RC oscillator. In case a crystal oscillator is used, a 32768 Hz quartz and two capacitors

(specified by the crystal manufacturer) are needed for AS3932.

AS3932 also offers the possibility to define the oscillator frequency using the internal RC-oscillator. This oscillator

can be calibrated with the microcontroller (see p. 27 of AS3932 data sheet) in order to increase its precision. In

this case the XIN and XOUT have to be connected to the positive supply voltage, as shown in figure 2-4.

TRANSMITTER

Figure 2-4: Application diagram of AS3932 in case the RC-oscillator is used.

Version 1.0, Date: 20/02/2009

VCC

CBAT

VCC

XIN

CL_ DAT

XOUT

DAT

LF1P

WAKE

AS3932

LF2P

SCL

LF3P

SDO

LFN

SDI

VSS

GND

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