ASCELL3911 データシートの表示（PDF） - austriamicrosystems AG

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ASCELL3911

ISM 868 MHz, 433 MHz and 315 MHz FSK Transmitter

austriamicrosystems AG 

ISM 868 MHz, 433 MHz and 315 MHz FSK Transmitter – Preliminary Data Sheet

ASCell3911

Austria Mikro Systeme International AG

ASCell3911

DATA I

D_EN I

D_CLK I

WAKEUP I/O

µC_CLK I/O

µC

O SERIAL DATA OUT (P1)

O SERIAL DATA ENABLE (P2)

O SERIAL DATA CLOCK (P3)

10k

O STOP TRANSMIT (P4)

I NCLEAR

I CLK

10k

SW

Transmit

button

Figure 3:

Interconnection of the ASCell3911 with a typical µC with one button to wake up the whole

system (example).

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

open

SW

closed

µC_CLK

WAKEUP

P4

standby

startup 32 clocks

SC3911 reset µC

16 clocks

startup

µC

active/transmisson

µC SC3911

4 clocks standby

power

down µC

Figure 4:

µC interface timing for wake-up and power down control.

Note:

The dashed lines indicate w eak high or low state when the µC_CLK or WAKEUP output of the ASCell3911 is disabled

(in high-resistive Z state) and pulled ”H” or ”L” by the internal pull-up device or by the µC via a resistor. These weak

states can be overridden by the ASCell3911 if the respective outputs are enabled. Whenever a line is pulled via an ex-

ternal resistor, however, this should override the internal pull-up devices of the ASCell3911.

1.6.1 Interface Description

It is assumed that the µC remains in low power standby mode as long as the P4 pin is kept ”L”

and no clock cycles are applied.

Standby: During standby (default after VCC-on) the XTAL oscillator is turned off and ASCell3911

holds the µC in a reset state:

Rev. A, February 2000

Page 6 of 13

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