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Teilenummer | U9280M-H |
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Beschreibung | Microcontroller | |
Hersteller | ATMEL Corporation | |
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Gesamt 24 Seiten www.DataSheet4U.com
Features
• 4-bit HARVARD Architecture
• 4k × 8-bit Application ROM
• 256 × 4-bit RAM
• 32 × 16-bit EEPROM
• 10 Bi-directional I/Os
• 4 External Interrupt Inputs (SSO20)
• 8 Interrupt Levels
• 2 × 8-bit Multifunction Timer/Counter
• Interval Timer with Watchdog
• Two-Wire Interface (TWI)
• Voltage Supervisor
• On-chip RC Oscillator
• On-chip Crystal Oscillator
Benefits
• Contactless Power Supply and Communication Interface
• Power Management for Contactless and Battery Power Supply
• Shift-register-supported Modulator and Demodulator Stages
• Low Power Consumption
• Active Mode < 300 µA at 2V and 1 MHz System Clock Frequency
(2 µs Instruction Cycle)
• Power-down Mode < 1 µA
• Supply Voltage 2.0V to 6.5V
• High-level Language Programming in qFORTH
• Operating Speed: 1 µs to 10 µs Instruction Cycle (2 µs at VDD = 2V)
1. Description
The U9280M-H IC is a multi-chip module for remote control and contactless ID sys-
tems. It consists of the ATAR092 microcontroller and U3280M transponder interface
circuit with EEPROM. A coil connected to the transponder interface serves as a wire-
less bi-directional communication interface as well as a power supply for the
microcontroller and the interface. As a transponder, the device is supplied by a mag-
netic RF field applied at the coil. For IR- or RF-transmitter applications, it can be
supplied by a battery. The microcontroller supports, with its built-in timers, a wide
range of IR- and RF-transmission modes such as burst-modulation modes, PWM-,
NRZ-, Manchester- and Bi-phase coding.
Microcontroller
with
Transponder
Interface
U9280M-H
Rev. 4591B–RFID–09/05
For the storage of data such as key codes, identifiers and configuration bits, a 512-bit EEPROM
w w w . D a t a S ish aevaeilat b4leUon. thceochmip. It can be read and written to by the microcontroller via a TWI-compatible
two-wire serial interface. The serial interface, the EEPROM and the microcontroller are supplied
with the voltage at the VDD pin. That means the microcontroller can read and write to the
EEPROM if the supply voltage is in the operating range.
The U3280M contains additional operating modes to support a wide range of applications.
These modes can be controlled via the serial interface. The power management can be
switched off by software to disable the automatic switching between battery and field. This sup-
ports applications with battery supply only.
There is an on-chip Bi-phase and Manchester modulator. It can be selected and controlled via
the serial interface with a special mode control byte. If this modulator is used the external con-
nection to the modulator input is not necessary.
3.3 Modulation
The transponder interface can modulate the magnetic field by a modulator to transmit data to a
base station. It modulates the coil voltage by varying the coil‘s load. The modulator can be con-
trolled via the MOD pin. A high level 1 increases the current into the coil inputs and damps the
coil voltage. A low level 0 decreases the current and increases the coil voltage. The modulator
generates a voltage stroke of about 2 Vpp at the coil. A high level at the MOD input makes the
maximum of the field energy available at VDD. During a reset a high level at the MOD input
causes the optimum conditions for starting the device and charging the capacitor at VDD after the
field is applied at the coil.
3.3.1
Digital Input to Control the Damping Stage (MOD)
Mod = 0: coil undamped
VCOIL_peak = VDD × 2 + VCMS = VCU
Mod = 1: coil damped
VCOIL_peak = VDD × 2 = VCD
VCMS = VCID: modulation voltage stroke at coil inputs
Note: If the automatic power management is disabled the internal front end VDD is limited at VDDC. In this
case the value VDDC must be used in the formula above.
3.4 Field Clock
The field clock extractor of the interface makes the field clock available for the microcontroller. It
can be used to supply timer inputs to synchronize modulation and demodulation with the field
clock.
6 U9280M-H
4591B–RFID–09/05
6 Page 3.10.3 Acknowledge Polling
www.DataSheet4U.com If the EEPROM is busy with an internal write cycle, all inputs are disabled and the EEPROM will
not acknowledge until the write cycle is finished. This can be used to detect the end of the write
cycle. The master must perform acknowledge polling by sending a start condition followed by
the control byte. If the device is still busy with the write cycle, it will not return an acknowledge
and the master has to generate a stop condition or perform further acknowledge polling
sequences. If the cycle is complete, it returns an acknowledge and the master can proceed with
the next read or write cycle.
Write One Data Byte
Start
Control byte A Data byte 1
Write Two Data Bytes
Start
Control byte A Data byte 1
Write Control Byte Only
Start
Control byte A
Stop
Note: A = acknowledge
A Stop
A Data byte 2
A Stop
3.10.4 Write Control Bytes
Write low byte first
MSB
LSB
A4 A3 A2 A1 A0 C1 C0 R/W
Row address
010
Byte order
LB(R)
HB(R)
MSB
LSB
Write high byte first A4 A3 A2 A1 A0 C1 C0 R/W
Row address
100
Byte order
HB(R)
LB(R)
Note: HB: high byte; LB: low byte; R: row address
12 U9280M-H
4591B–RFID–09/05
12 Page | ||
Seiten | Gesamt 24 Seiten | |
PDF Download | [ U9280M-H Schematic.PDF ] |
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