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ATA5771C/73C/74C
UHF ASK/FSK Transmitter with the Atmel AVR
Microcontroller
DATASHEET
General Features
Atmel® AVR® microcontroller and RF transmitter PLL in a single QFN24
5mm × 5mm package (pitch 0.65mm)
Operating frequency ranges 310MHz to 350MHz, 429MHz to 439MHz and
868MHz to 928MHz
Temperature range –40°C to +85°C
Supply voltage 2.0V to 3.6V allowing usage of single Li-cell power supply
Low power consumption
Active mode: typical 9.8mA at 3.0V and 4MHz microcontroller-clock
Power-down mode: Typical 200nA at 3.0V
Modulation scheme ASK/FSK
Integrated PLL loop filter
Output power of 8dBm at 315MHz / 7.5dBm at 433.92MHz / 5.5dBm at 868.3MHz
Easy to design-in due to excellent isolation of the PLL from the PA and power
supply
Single-ended antenna output with high efficient power amplifier
Very robust ESD protection: HBM 2500V, MM100V, CDM 1000V
High performance, low power AVR 8-bit microcontroller
Advanced RISC architecture
Non-volatile program and data memories
4Kbytes of in-system programmable program memory flash
256Bytes in-system programmable EEPROM
256Bytes internal SRAM
Programming lock for self-programming flash program and EEPROM data security
Peripheral features
Two timer/counter, 8- and 16-bit counters with two PWM channels on both
10-bit ADC
On-chip analog comparator
Programmable watchdog timer with separate on-chip oscillator
Universal serial interface (USI)
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Special microcontroller features
debugWIRE on-chip debug system
In-system programmable via SPI port
External and internal interrupt sources
Pin change interrupt on 12 pins
Enhanced power-on reset circuit
Programmable brown-out detection circuit
Internal calibrated oscillator
On-chip temperature sensor
12 programmable I/O lines
2 ATA5771C/73C/74C [DATASHEET]
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1. General Description
The Atmel® ATA5771C/73C/74C is a highly flexible programmable transmitter containing the Atmel AVR® microcontroller
Atmel ATtiny44V and the UHF PLL transmitters in a small QFN24 5mm × 5mm package. This device is a member of a
transmitter family covering several operating frequency ranges, which has been specifically developed for the demands of
RF low-cost data transmission systems with data rates up to 32kBit/s using ASK or FSK modulation. Its primary applications
are in the application of Remote Keyless-Entry (RKE), Passive Entry Go (PEG) System and Remote Start. The ATA5771 is
designed for 868MHz application, whereas ATA5773 for 315MHZ application and ATA5774 for 434MHz application.
Figure 1-1. ASK System Block Diagram
UHF ASK/FSK
Remote Control Transmitter
S1 PXY
S1 PXY
S1 PXY
PXY
PXY
PXY
PXY
Atmel ATA577x
VDD
GND
PXY
PXY
PXY
PXY
PXY
VS
Power
up/down
ENABLE
GND_RF
f/4 PLL
CLK
UHF ASK/FSK
Remote Control Receiver
Demod
Control
1 to 6 Micro-
controller
XTO
VCO
PA
VCC_RF
VS
PA_ENABLE
ANT2
ANT1
Antenna
Loop
Antenna
VS
LNA
PLL XTO
VCO
ATA5771C/73C/74C [DATASHEET]
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Figure 1-2. FSK System Block Diagram
UHF ASK/FSK
Remote Control Transmitter
S1 PXY
S1 PXY
S1 PXY
PXY
PXY
PXY
PXY
Atmel ATA577x
VDD
GND
PXY
PXY
PXY
PXY
PXY
VS
Power
up/down
ENABLE
GND_RF
f/4 PLL
CLK
UHF ASK/FSK
Remote Control Receiver
Demod
Control
1 to 6 Micro-
controller
XTO
VCO
PA
VCC_RF
VS
PA_ENABLE
ANT2
ANT1
Antenna
Loop
Antenna
LNA
PLL XTO
VCO
VS
4 ATA5771C/73C/74C [DATASHEET]
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2. Pin Configuration
Figure 2-1. Pinning QFN24 5mm × 5mm
VCC
PB0
PB1
PB3/RESET
PB2
PA7
24 23 22 21 20 19
1 18
2 17
3 16
4 15
5 14
6 13
7 8 9 10 11 12
PA0
PA1
PA2
PA3/T0
PA4/USCK
PA5/MISO
Table 2-1.
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Pin Description
Symbol
VCC
PB0
PB1
PB3/RESET
PB2
PA7
PA6 / MOSI
CLK
PA_ENABLE
ANT2
ANT1
GND
PA5/MISO
PA4/SCK
PA3/T0
PA2
PA1
PA0
GND
XTAL
VS_RF
GND_RF
ENABLE
GND
GND
Function
Microcontroller supply voltage
Port B is a 4-bit bi-directional I/O port with internal pull-up resistor
Port B is a 4-bit bi-directional I/O port with internal pull-up resistor
Port B is a 4-bit bi-directional I/O port with internal pull-up resistor/reset input
Port B is a 4-bit bi-directional I/O port with internal pull-up resistor
Port A is an 8-bit bi-directional I/O port with internal pull-up resistor
Port A is an 8-bit bi-directional I/O port with internal pull-up resistor
Clock output signal for microcontroller. The clock output frequency is set by the crystal to
fXTAL/4
Switches on power amplifier. Used for ASK modulation
Emitter of antenna output stage
Open collector antenna output
Ground
Port A is an 8-bit bi-directional I/O port with internal pull-up resistor
Port A is an 8-bit bi-directional I/O port with internal pull-up resistor
Port A is an 8-bit bi-directional I/O port with internal pull-up resistor
Port A is an 8-bit bi-directional I/O port with internal pull-up resistor
Port A is an 8-bit bi-directional I/O port with internal pull-up resistor
Port A is an 8-bit bi-directional I/O port with internal pull-up resistor
Microcontroller ground
Connection for crystal
Transmitter supply voltage
Transmitter ground
Enable input
Ground
Ground/backplane (exposed die pad)
ATA5771C/73C/74C [DATASHEET]
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