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PDF ATA5277 Data sheet ( Hoja de datos )
| Número de pieza | ATA5277 | |
| Descripción | STAND-ALONE ANTENNA DRIVER | |
| Fabricantes | ATMEL Corporation | |
| Logotipo |  |
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Features
• Programmable Driver Current Regulation
• Antenna Driver Stage for 1 A Peak Current
• LF Baudrates between 1 kbaud to 8 kbaud
• Integrated Oscillator for Ceramic Resonators
• Two Inputs for Push-button Switches
• Bi-directional Single-wire Interface
• Diagnosis Function and Overtemperature Protection
• Quick Start Control (QSC) for Fast Oscillation Build-up and Decay Timing
• Operation Temperature -40°C to +85°C
• Carrier Frequency Range from 100 kHz to 150 kHz
• Amplitude Shift Keying (ASK) Modulation
• Phase Shift Keying (PSK) Modulation
• Power Supply Range 7 V to 16 V Direct Battery Input (6 V and 28 V with Limited
Function Range)
• EMI and ESD According to Automotive Requirements
• Highly Integrated — Less External Components Required
Applications
• Car Access
Benefits
• Dedicated for Decentralized Systems
• Constant Magnetic Field Strength
Electrostatic sensitive device.
Observewww.DataSheet4U.com precautions for handling.
Stand-alone
Antenna Driver
ATA5277
Preliminary
Description
The circuit is an integrated BCDMOS antenna driver IC dedicated as a transmitter for
Passive Entry/Go (PEG) car applications and for other handsfree access control
applications.
It includes the full functionality to generate a magnetic LF field in conjunction with an
antenna coil to transmit data to a receiver in a key fob, card or transponder. The trans-
mission can be controlled via an one wire I/O interface (DIO) by an external control
unit.
Rev. 4669B–RKE–10/03
1 page  
4669B–RKE–10/03
ATA5277 [Preliminary]
Figure 3. Wake-up by External Switch
Ext. switch
DIO line
Carrier state
t deb
t wake
In Figure 3, the IC is woken up by an external switch (pulled to ground). After a
debouncing time tdeb, the IC leaves sleep mode and sends a wake-up impulse to a con-
nected microcontroller via the DIO line. Note that this impulse is already the start bit of
the first command. After that, the ATA5277 waits for a control or status command from
the microcontroller. The carrier remains off as the configuration bit M_Wake (see control
command 2) is '0'.
Figure 4. Wake-up by External Switch, Automatic Field Generation
Ext. switch
DIO line
Carrier state
tdeb t wake
The wake-up event as shown in Figure 4 is the same as in Figure 3, except for the con-
figuration bit M_Wake which is '1'. The driver stage will start operation after the wake-up
command has been confirmed. This behaviour can be used to build up an LF field inde-
pendently of the connected microcontroller.
Figure 5. Wake-up by Connected Microcontroller, Automatic Field Generation
Ext. switch
DIO line
Carrier state
t deb
t wake
Figure 5 shows a wake-up event triggered by the connected microcontroller, which now
pulls the DIO line to ground. To prevent the ATA5277 from waking up due to noise on
the DIO line, there is also a debouncing time before it will start operation. In this exam-
ple, M_Wake is again '1', so the driver stage starts operation after the wake-up event
has been confirmed.
5
5 Page 
Modulation
QSC Feature
4669B–RKE–10/03
ATA5277 [Preliminary]
After the IC has woken up and a command has been received, the DIO line is used for
LF modulation. The IC has two modulation modes, ASK and PSK. The mode can be
selected with the control command '0', bit 2. If ASK modulation mode is selected
(NASK_PSK = 0), the IC switches the carrier on and off, depending on the state of the
DIO line ('1' is on, '0' is off). Note that, depending on the quality of the connected LF
antenna and on the desired LF data rate, the usage of the QSC transistor T1 (see typi-
cal applications section) is neccessary. If PSK mode is selected (NASK_PSK = 1), the
phase of the carrier is shifted by 180° on any change of the DIO line. Here, the QSC
transistor must be used.
Figure 9. Modulation Modes
D_IO
Coil Voltage
(ASK Mode)
Coil Voltage
(PSK Mode)
Modulation after Setup
Switch Off
Cycle
Standby
The IC switches from modulation mode to command mode if the DIO-line has not been
changed for a time peraiod longer than tmodsel.
The Quick Start Control (QSC) feature supports a short oscillation build up and decay
timing during LF data modulation. An external high-voltage MOS transistor is used as a
switch to close and open the current loop of the antenna. By synchronizing this switch to
the zero-crossing events of the antenna current, very short build-up and decay times for
the LF-field and hence high data baud rates can be achieved.
Figure 10. QSC Operation
DIO
QSC
Coil
with QSC transistor
ASK Modulation
PSK Modulation
The external transistor (T1 in the typical applications section) is driven by the QSC pin. It
provides a fast and synchronized gate-driver signal.
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet ATA5277.PDF ] | |
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