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PCF7991AT の電気的特性と機能

PCF7991ATのメーカーはPhilipsです、この部品の機能は「Advanced Basesation IC」です。


製品の詳細 ( Datasheet PDF )

部品番号 PCF7991AT
部品説明 Advanced Basesation IC
メーカ Philips
ロゴ Philips ロゴ 




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PCF7991AT Datasheet, PCF7991AT PDF,ピン配置, 機能
INTEGRATED CIRCUITS
DATA SHEET
PCF7991AT
Advanced Basestation IC
Product Specification (Rev. 1998 Apr 20)
printed 1998 Apr 20

1 Page





PCF7991AT pdf, ピン配列
Philips Semiconductors
Advanced Basestation IC
Product Specification (Rev. 1998 Apr 20)
PCF7991AT
1 FEATURES
Fully integrated single chip basestation
Compatible with PCF79xx transponder family
Robust antenna coil power driver stage with modulator
High performance adaptive sampling time AM/PM
demodulator (patent pending)
Read and write function
Programmable modulator/demodulator characteristics
On-chip clock oscillator and divider in the case of
external clock reference
Antenna rupture and short circuit detection
Low power consumption
Very low power stand-by mode
Low external component count
Small package (SO14).
2 GENERAL DESCRIPTION
The PCF7991AT is a fully integrated Advanced
Basestation IC, ABIC, designed for car immobilizer
systems providing read and write access to an
identification transponder. The device is intended for use
with the Philips transponder family (PCF79xx) as well as
other transponder types operating at 125 kHz and
employing ASK, Amplitude Shift Keying for write and
AM/PM for the read operation. The receiver characteristics
(amplifier gain, filter cutoff frequencies) can be optimized
to system and transponder requirements. The
PCF7991AT IC is designed for easy integration into
immobilizer read/write and read-only systems featuring a
high degree of integration and very low external
component count. The device integrates a powerful
antenna driver/modulator, a low-noise adaptive sampling
time demodulator, programmable filters/amplifier and
digitizer, required to design high-performance
basestations. A three wire microcontroller interface is
provided for programming the PCF7991AT as well as for
the bidirectional communication with the transponder. The
three-wire interface can be configured for two wire
operation by connecting the data input and the data
output.
The device employs a unique Adaptive Sampling Time
(AST) demodulation technique, that extends the system
operation range and eliminates the effect of a zero
amplitude modulation response from the transponder, as a
result of resonance frequency tolerances.
3 ORDERING INFORMATION
EXTENDED
TYPE NUMBER
PCF7991AT/1081
PACKAGE
NAME
DESCRIPTION
SO14 plastic small outline package; 14 leads
VERSION
SOT108-1
TEMPERATURE
RANGE (°C)
40 to +85
printed 1998 Apr 20
3


3Pages


PCF7991AT 電子部品, 半導体
Philips Semiconductors
Advanced Basestation IC
Product Specification (Rev. 1998 Apr 20)
PCF7991AT
7 MINIMUM APPLICATION CIRCUITRY
The following figure shows a minimal application circuitry for the PCF7991AT. The antenna coil La together with the
capacitor Ca form a series resonant LC circuit (f = 125 kHz). The antenna tap voltage is attenuated by RV and the input
impedance of the RX-pin. The capacitors at XTAL1 and XTAL2 are selected according to the crystal or ceramic resonator
specification. In the case of an external clock reference they may be omitted. The capacitors at QGND and CEXT are for
device internal biasing and decoupling purposes.
VDD
10 µF
+
100nF
La
Ca
Rv
TX1 VDD XTAL1
TX2 XTAL2
DIN
RX DOUT
SCLK
QGND
CEXT
VSS MODE
100nF
100nF
TO
MICRO-
PROCESSOR
Fig.3 Minimum application circuitry
printed 1998 Apr 20
6

6 Page



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部品番号部品説明メーカ
PCF7991AT

Advanced Basesation IC

Philips
Philips


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