ISM 868 MHz, 433 MHz and 315 MHz FSK Transmitter – Preliminary Data Sheet
ASCell3911
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.
RF+
1
RF-
2
PAGND
3
RESET/TEST 4
XTAL
5
VDDSYN
6
GNDSYN
7
14
VDD
13
DATA
12
D_CLK
11
D_EN
10
WAKEUP
9
µC_CLK
8
GND
TSSOP-14
This pin-out is preliminary and will change for the real implementation!
Rev. A, February 2000
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