AS3901 Просмотр технического описания (PDF) - austriamicrosystems AG

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AS3901

ISM 433/315 MHz FSK/ASK Transmitter

austriamicrosystems AG 

ISM 433/315 MHz FSK/ASK Transmitter – Data Sheet

AS3901

AS3901

uC

STDBY I

DATA I

TX/ASK I

NRES O

CLK O

10k

SW

Transmit

switch

O STDBY

O DATA

O TX/ASK

I RESET

I CLK

Figure 2:

Interconnection of the AS3901 with a typical µC.

Note:

At room temperature, resistor values of ≈10 kΩ are suggested for the µC interface.

For other temperatures to be calculated from figure 5.

TX/ASK

CLK

NRES

STDBY

XTon

standby

reset

uC

init PLLon

TX on

transmitting

3 clocks standby

Figure 3:

µC interface timing for a transmission cycle.

Note:

Activating the transmit switch results in a „weak L state“ at TX/ASK. It can be overridden by the

microcontroller so that the transmission cycle remains unaffected by the duration the switch is pressed. The STDBY and

TX/ASK inputs have internal pullup resistors of ~100kΩ

Rev. 6, August 2000

Page 6 of 18

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