PCF7991AT NXP Semiconductors, PCF7991AT Datasheet
PCF7991AT
Manufacturer Part Number
PCF7991AT
Description
Manufacturer
NXP Semiconductors
Datasheet
1.PCF7991AT.pdf
(1 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
PCF7991AT
Manufacturer:
NXP/恩智浦
Quantity:
20 000
Part Number:
PCF7991AT/1081/M
Manufacturer:
NXP/恩智浦
Quantity:
20 000
Part Number:
PCF7991AT/1081/M,1
Manufacturer:
NXP/恩智浦
Quantity:
20 000
Philips Semiconductors
Product Profile
Advanced Basestation IC, ABIC
Features
Minimum Application Circuitry
May 1998
Extended system operating range due to powerful
AM/PM demodulation technique
Ideally suited for "Intelligent Antenna" and "Active
Antenna" architectures
High antenna drive capabilities, CW: 200mAp
Low antenna driver output resistance, 3.5
Excellent receiver sensitivity, 2mVpp
Large receiver dynamic range
Programmable clock divider, modulator, receiver
gain and filter characteristics
Fast "read after write" receiver settling
characteristics
On-chip receive EMI filter
Antenna failure mode detection
Few external components
Operating supply voltage: 4.5 to 5.5 V
Power down mode: 7 A @ 5.5 V
14-pin SO package
4.5 ... 5.5 V
TX1
TX2
RX
Antenna
Driver
Filter
EMI
QGND
Demodulator
Modulation
Pulse Gen.
Synchron
VDD
PCF 7991
Control
Unit
CEXT
Clk Divider
SC Filter
Amplifier
Timing
General Description
The PCF7991 is a highly integrated and powerful
advanced basestation IC, ABIC, ideally suited for
vehicle immobilisation applications. The device
incorporates all necessary functions to facilitate reading
and writing of transponders.
The ABIC, PCF7991 employs a unique AM/PM
demodulation technique that extends the system
operating range compared with simple envelope
detection.
Optimised to operate with the Philips transponder family
(PCF79xx), the ABIC can be used in combination with
commonly available transponder that employ ASK
modulation. ASK modulation and receive characteristics
are widely programmable for powerful system
adaptation. The ABIC fits "Intelligent Antenna" as well
as "Active Antenna" applications.
The carrier frequency can be derived from an on-chip
oscillator or an external clock source. A wide range of
clock frequencies can be applied due to the
programmable on-chip clock divider circuitry.
The device enables system diagnostic functions by
antenna fail detection features.
Communication with the device and the transponder is
provided via the serial microcontroller interface.
Employing CMOS technology, the device features low
power operation and supports Idle and Powerdown
modes.
XTAL1
Oscillator
Interface
Register
Serial
VSS
XTAL2
To microcontroller
PCF7991AT
DOUT
DIN
CLK
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