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Read / Write Base Station IC
U2270B
Description
IC for IDIC® *) read-write base stations
The U2270B is a bipolar integrated circuit for read-write
base stations in contactless identification and immo-
bilizer systems.
The IC incorporates the energy transfer circuit to supply
the transponder. It consists of an on-chip power supply, an
oscillator, and a coil driver optimized for automotive-
specific distances. It also includes all signal-processing
circuits which are necessary to form the small input signal
into a microcontroller-compatible signal.
The U2270B is well suitable to perform read operations
with e5530-GT and TK5530-PP transponders and also
performs read-write operations with TK5550-PP and
TK5560-PP transponders.
Features
D Carrier frequency fosc 100 KHz – 150 KHz
D Typical data rate up to 5 Kbaud at 125 KHz
D Suitable for Manchester and Bi-phase modulation
D Power supply from the car battery or from
5-V regulated voltage
D Optimized for car immobilizer applications
D Tuning capability
D Microcontroller-compatible interface
D Low power consumption in standby mode
D Power supply output for microcontroller
Applications
D Car immobilizers
D Animal identification
D Access control
D Process control
D Further industrial applications
Case: SO16 U2270B-FP
Transponder / TAG
Read / write base station
Transp.
IC
e5530
e5550
e5560
RF– Field
typ. 125 kHz
Osc
U2270B
NF read channel
Carrier
enable
Data
output
MCU
Unlock
System
TK5530-PP
e5530-GT
TK5550-PP
TK5560-PP
Figure 1.
*) IDIC® stands for IDentification Integrated Circuit and is a trademark of TEMIC.
9300
TELEFUNKEN Semiconductors
Rev. A3, 13-Dec-96
1 (13)

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U2270B
Pin Description
GND 1
16 HIPASS
Output 2
15 RF
OE 3
14 VS
Input 4
13 Standby
MS 5
CFE 6
DGND 7
12 VBatt
11 DVS
10 VEXT
COIL2 8
9844
Figure 2. Pinning
9 COIL1
Block Diagram
DVS
VEXT
Pin Symbol
Function
1 GND Ground
2 Output Data output
3 OE Data output enable
4 Input Data input
5 MS Mode select coil 1: Common
mode / Differential mode
6 CFE Carrier frequency enable
7 DGND Driver ground
8 COIL 2 Coil driver 2
9 COIL 1 Coil driver 1
10 VEXT External power supply
11 DVS Driver supply voltage
12 VBatt Battery voltage
13 Standby Standby input
14 VS Internal power supply (5 V)
15 RF Frequency adjustment
16 HIPASS DC decoupling
VS VBatt
COIL1
Power supply
=1
COIL2
DGND
Driver
Input
Low pass filter
&
Oscillator
Amplifier
HIPASS
Schmitt trigger
GND
OE
Figure 3.
&
Frequency
adjustment
Standby
MS
CFE
RF
Output
9692
2 (13)
TELEFUNKEN Semiconductors
Rev. A3, 13-Dec-96

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Functional Description
Power Supply (PS)
DVS
VEXT
V S V Batt
internal supply
U2270B
Standby
9 V 25 kW
COILx
6 V 6 V 18 V
PS
12 kW
DRV
DGND
Figure 4. Equivalent circuit of power supply and antenna driver
11413
The U2270 can be operated with one external supply
voltage or with two externally-stabilized supply voltages
for an extended driver output voltage or from the 12-V
battery voltage of a vehicle. The 12-V supply capability
is achieved via the on-chip power supply (see figure 4).
The power supply provides two different output voltages,
VS and VEXT.
VS is the internal power supply voltage except for the
driver circuit. Pin VS is used to connect a block capacitor.
VS can be switched off by the pin STANDBY. In standby
mode, the chip’s power consumption is very low. VEXT is
the supply voltage of the antenna’s pre-driver. This
voltage can also be used to operate external circuits, i.e.,
a microcontroller. In conjunction with an external NPN
transistor, it also establishes the supply voltage of the
antenna coil driver, DVS.
TELEFUNKEN Semiconductors
Rev. A3, 13-Dec-96
3 (13)