1
Features
4-bit HARVARD Architecture
4 k
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 A at 2 V and 1 MHz System Clock Frequency
(2 s Instruction Cycle)
Power-down Mode < 1 A
Supply Voltage 2.0 V to 6.5 V
High-level Language Programming in qFORTH
Operating Speed: 1 s to 10 s Instruction Cycle (2 s at V
DD
= 2 V)
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
Preliminary
Rev. 4591ARFID03/03
2
U9280M-H
4591ARFID03/03
Figure 1. Block Diagram
Pin Configuration
Figure 2. Pinning SSO20
Damping
stage
512-bit
EEPROM
memory
U9280M-H transponder interface
COIL1
COIL2
V
SS
ATAR092 microcontroller
OSC2
OSC1/ROSC
BP60/T3O
RAM
Rectifier
VDD
Field/GAP
detect
VBATT
MOD
NGAP
BP42/
T2O
BP63/T3I
BP23
BP53/INT1
BP40/
SC/INT3
BP50/INT6
BP41/
VMI/
T2I
BP43/
SD/INT3
Timer/
counter
C
Biphase
modulator
ROM
voltage monitor
Reset
BP20/NTE
Serial
interface
Clock
extractor
FC
Power
management
4-bit CPU core
MCL
I/O-Ports
Serial
interface
Modulator/
demodulator
Oscillators
clock management
1
VDD
BP40/SC/INT3
BP50/INT6
BP53/INT1
OSC1/ROSC
OSC2
BP60/T3O
BP41/VMI
BP43/SD/INT3
BP42/T2O
VSS
BP63/T3I/INT5
BP20/NTE
BP23
COIL1
VBATT
MOD
COIL2
NGAP
U9280M-H
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
FC
3
U9280M-H
4591ARFID03/03
Pin Description
Pin
Symbol
Function
1
COIL1
Coil input 1, Pin to connect an LC antenna for communication and field supply
2
COIL2
Coil input 2, Pin to connect an LC antenna for communication and field supply
3
VBATT
Power-supply voltage input to connect a battery
4
VDD
Power-supply voltage for the microcontroller and EEPROM. At this pin a capacitor (0.5 F to 10 F)
must be connected to buffer the voltage during field supply and to block the V
DD
of the
microcontroller.
5
BP40/SC/INT3
I/O-port line/serial clock line/INT3 input (falling edge sensitive)
6
BP53/INT3
I/O-port line/INT3 interrupt input (falling or rising edge sensitive)
7
BP50/INT6
I/O-port line/INT6 interrupt input (falling or rising edge sensitive)
8
OSC1/ROSC
Oscillator- or external system-clock input/input for RC-oscillator resistor
9
OSC2
Oscillator output
10
BP60/T3O
Bi-directional I/O-line/Timer 3 output/modulator output
11
BP63/T3I/INT5
I/O-port line/INT5 interrupt input/Timer 3 input/demodulator input
12
BP20/NTE
BP20-I/O-port line/test mode input. This input is used to control the test modes. During POR it must
not be connected with a low impedance to V
DD.
13
BP23
I/O-port line
14
BP41/VMI
I/O-port line/Voltage monitor input/Timer 2 input
15
BP42/T2O
I/O-port line/Timer 2 output/modulator output
16
BP43/SD/INT3
I/O-port line/serial data line/INT3 input (falling edge sensitive)
17
VSS
Circuit ground
18
FC
Field clock output of the clock extractor
19
MOD
Modulation input - front end. Must be connected to the modulator output T2O.
20
NGAP
Gap detect output - front end. Must be connected to the demodulator input T3I.
4
U9280M-H
4591ARFID03/03
Functional
Description
The U9280M-H multi-chip module contains a microcontroller and a transponder IC
mounted in a single package. Everything necessary for remote control and wireless
identifcation systems is integrated: Inputs to connect keys, outputs to control an IR- or
RF transmitter and to drive indicator LEDs, an EEPROM to store key code and identifi-
ers, and an interface for contactless communication and a power supply.
The U3280M is a transponder interface consisting of an analog front end for contactless
data communication and power supply, and a serial 512-bit EEPROM. In addition, it
includes power management to switch the battery or magnetic-field power supply. For
modulation and demodulation of the magnetic field, the device has input and output pins
to connect the microcontroller. The MOD, NGAP and FC Pins can be connected exter-
nally to the modulator, demodulator and timer I/O pins of the microcontroller. Access to
the EEPROM is possible via a two-wire serial interface. The ATAR092 microcontrollers
are equipped with compatible two-wire serial interface to communicate with the
U3280M. In the U9280M-H the serial interfaces of the transponder interface and the
microcontroller are linked internally.
ATAR092
The ATAR092 microcontroller is a member of the Atmel's 4-bit single-chip microcontrol-
ler family. It is especially designed for remote-control applications. It consists of an
advanced stack-based 4-bit CPU core with 4 K ROM, 256 nibble of RAM and on-chip
peripherals. The CPU is based on the HARVARD architecture and contains an interrupt
controller with 8 prioritized interrupt levels.
The peripherals include parallel I/O ports, two 8-bit programmable multifunction
timer/counters, a two-wire serial interface, an interval timer with watchdog function and
a voltage supervisor. The serial interface supports, together with the timers, a modulator
and demodulator stage for Manchester, Bi-phase and pulse-width modulation and
demodulation. The integrated clock generator contains a RC-, a 32-kHz crystal, a
4-MHz crystal oscillator and a programmable input to use an external clock.
Note:
In the U9280M-H not all I/O pins of the ATAR092 are available (see "Pin Description").
The microcontroller is fully described in the MARC4 ATAR092 data sheet.
5
U9280M-H
4591ARFID03/03
Figure 3. Block Diagram ATAR092
The U3280M
Transponder Interface
The transponder interface contains a rectifier stage to rectify the AC from the coil inputs
and to supply itself and an additional microcontroller device with power from an LC-res-
onant circuit at the coil inputs. It is also possible to supply the device via the V
Batt
-input
with DC from a battery. The built-in power management switches automatically between
battery supply (V
Batt
pin) and coil supply. It switches to coil supply if a field is applied at
the coil and switches back to battery if the field is removed.
The voltage from the coil or the V
Batt
pin is output at the V
DD
pin to supply the microcon-
troller device. At the V
DD
pin a capacitor must be connected to smooth and buffer the
supply voltage for the transponder interface and the microcontroller. This capacitor is
also used to buffer the supply voltage during communication (damping and gaps in the
field).
For communication, a damping-stage and a gap-detect circuitry is on the chip. By
means of the damping stage the coil voltage can be modulated to transmit data via the
field. It can be controlled with the modulator input (MOD pin) via the microcontroller. The
gap detection circuitry detects gaps in the field and outputs the gap/field signal at the
gap detect output (NGAP pin). It can be used to receive data via a modulated field and
to check if a field is applied at the coil.
For the storage of data such as key codes, identifiers and configuration bits, a 512-bit
EEPROM is available on the chip. 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 V
DD
pin. That means the microcon-
troller can read and write to the EEPROM if the supply voltage is in the operating range.
Voltage monitor
External input
MARC4
UTCM
OSC1 OSC2
I/O bus
ROM
RAM
4-bit CPU core
256 x 4 bit
V DD
V SS
Data direction +
alternate function
Data direction +
interrupt control
Port 4
Port 5
Data dir. +
alt. function
Port 6
Timer 3
Brown-out protect
RESET
Clock management
Timer 1
watchdog timer
Timer 2
Serial interface
Port 1
P
o
r
t
2
D
a
t
a
d
i
r
e
c
t
i
o
n
T2O
SD
SC
T3O
T3I
BP10
BP13
BP20/NTE
BP21
BP22
BP23
BP40
INT3
SC BP41
VMI
T2I
BP42
T2O BP43
INT3
SD
BP50
INT6
BP51
INT6
BP52
INT1
BP53
INT1
BP60
T3O
BP63
T3I
RC
oscillators
Crystal
oscillators
4 K x 8-bit
VMI
with modulator
SSI
External
clock input
interval- and
8/12-bit timer
8-bit
timer / counter
with modulator
and demodulator
T2I
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