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

ASCell3911

Rev. A, February 2000

Page 2 of 13

Austria Mikro Systeme International AG

Key Features

• Supports triple band operation: Europe 868 MHz and 433 MHz-, US and Japan 315 MHz ISM

band.

• Designed to be conform to EN 300 220, and FCC 47 CFR Ch.1 par.15 requirements.

• Provides highly reliable packet oriented data transmission in blocks of 128 bit.

• Event oriented single message transmission and status oriented and continuous message

transmission supported.

• Special transmission protocol for high reliability even in presence of burst interferer (e.g.

GSM) implemented.

• Supports clock for an external µC and allows clock free total shut down of the whole system.

• Wide supply range between 2,2 to 3,5 V.

• Low TX current, typical 8,5 mA @ 2,2 V.

• Low standby current, typical 0,5 µA.

• Wide operating temperature range from –40 °C to +85 °C.

• Only a low cost XTAL for 25 ppm (868 MHz) or 50 ppm (433 and 315 MHz) reference fre-

quency tolerance required.

• Typically only 1 XTAL, 4 capacitors and 2 inductors externally required.

General Description

The ASCell3911 is a low power, triple ISM band (868 / 433 / 315 MHz), single channel FSK

transmitter designed to work in a remote control link together with the SC3912 receiver system

cell.

The ASCell3911 performs packet oriented data transmission, in a single message- or continuos-

message mode using a special protocol to ensure high reliability even in presence of strong

pulsed interferers in close adjacent bands like e.g. GSM.

It contains a general bi-directional five line micro-controller (µC) interface to support the µC with

clock- and reset- signal and to operate the highly efficient power up/down management includ-

ing. This allows e.g. a clock-free total shut-down of the whole transmitter system.

As external components the ASCell3911 need only a reference XTAL, 4 capacitors and up to 2

inductors.

Applications

• Key-less car entry systems.

• Short-range packet oriented data transmission.

• Security applications and alarm systems.

• Domestic remote control systems.

• Industrial remote control systems.

• Remote metering.

TSSOP-14

D_EN

11

WAKEUP

10

µC_CLK

9

GND

8

D_CLK

12

DATA

13

VDD

14

RF+

1

RF-

2

PAGND

3

RESET/TEST

4

XTAL

5

VDDSYN

6

GNDSYN

7

This pin-out is preliminary and will change for the real implementation!