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PDF ATA5774 Data sheet ( Hoja de datos )
| Número de pieza | ATA5774 | |
| Descripción | (ATA5771 - ATA5774) Microcontroller | |
| Fabricantes | ATMEL Corporation | |
| Logotipo |  |
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General Features
• Complete Key Fob IC Consisting of an AVR® Microcontroller and RF Transmitter PLL in
a Single QFN24 5 mm × 5 mm Package (Pitch 0.65 mm)
– f0 = 310 MHz to 350 MHz (ATA5773)
– f0 = 429 MHz to 439 MHz (ATA5774)
– f0 = 868 MHz to 928 MHz (ATA5771)
• Automotive Qualified
• Temperature Range –40° C to +85° C
• ESD Protection: HBM 2500V, MM 100V, CDM 1000V
• Supply voltage 2.0V to 4.0V for Single Li-cell Power Supply
• Low Power Consumption
– Active Mode: Typical 9.8 mA at 3.0V and 4 MHz Microcontroller-clock
– Power-down Mode: Typical 200 nA at 3.0V
• Modulation Scheme ASK/FSK
• Integrated PLL Loop Filter
• High Output Power (8 dBm at 315 MHz/7.5 dBm at 433 MHz/ 5.5 dBm at 868 MHz)
• High Performance, Low Power AVR 8-bit Microcontroller
• Advanced RISC Architecture
• Non-volatile Program and Data Memories
– 4 KByte of In-system Programmable Program Memory Flash
– 256 Bytes In-system Programmable EEPROM
– 256 Bytes Internal SRAM
• Peripheral Features
– Two Timer/Counter, 8- and 16-bit Counters with Two PWM Channels on Both
– 10-bit ADC
– Programmable Watchdog Timer with Separate On-chip Oscillator
– Universal Serial Interface (USI)
• 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
Microcontroller
with
UHF ASK/FSK
Transmitter
ATA5771
ATA5773
ATA5774
1. General Description
The ATA5771/ATA5773/ATA5774 is a single key fob IC containing the AVR microcon-
troller ATtiny44V and the UHF PLL transmitters T5750/53/54 build-up using a stacked
die technique supplied in a QFN24 5 mm × 5 mm package. These devices have been
specially developed for the demands of RF low-cost data transmission systems with
data rates of up to 32 kBit/s. Its main applications are in the areas of Remote Key-
less-Entry (RKE), Passive Entry Go (PEG), and Remote Start. It can be used in the
frequency range of f0 = 310 MHz to 350 MHz, f0 = 429 MHz to 439 MHz or
f0 = 868 MHz to 928 MHz for ASK or FSK data transmission.
9137B–RKE–02/09
Free Datasheet http://www.datasheet4u.com/
1 page  
ATA5771/ATA5773/ATA5774
3. Functional Description
For a typical key fob application 3-4 interconnections between the microcontroller and the trans-
mitter are required (see Figure 1-1 on page 2 and Figure 1-2 on page 3). The CLK line is used to
allow the microcontroller to generate an XTAL-based transmitter signal. The ENABLE line is
used to start the XTO, PLL, and clock output of the transmitter. The PA_ENABLE line is used to
enable the power amplifier in ASK and FSK mode. In FSK mode a 4th line is necessary to modu-
late the load capacity of the XTAL. To wake-up the system from standby mode at least one key
input is required. After pressing the key, the microcontroller starts up with the internal RC oscilla-
tor. For TX operation user software must control ENABLE, PA_ENABLE and XTAL load
capacity as described in the following section.
If ENABLE = L and PA_ENABLE = L the transmitter and the microcontroller (MCU) are in
standby mode, reducing the power consumption so that a lithium cell can be used as power sup-
ply for several years.
If ENABLE = H and PA_ENABLE = L, the XTO, PLL and the CLK driver from the transmitter are
activated. The crystal oscillator together with the PLL from the RF transmitter typically requires
< 1 ms (ATA5773 < 3 ms) until the PLL is locked and the clock output (Pin 8) is stable.
If ENABLE = H and PA_ENABLE = H, the XTO, PLL, CLK driver and the Power Amplifier (PA)
are switched on. The ASK modulation is done by switching on/off the power amplifier via
PA_ENABLE. The FSK modulation is done by switching on/off an additional capacitor between
the XTAL load capacitor and GND, thus changing the reference frequency of the PLL. This is
done using a MOS switch controlled by a microcontroller output. The power amplifier is switched
on via PA_ENABLE = H.
The MCU has to wait at least > 1 ms ATA5774 (> 3 ms ATA5773, > 4 ms ATA5771) after setting
ENABLE = H, before the external clock can be used. The external clock is connected via the
timer0 input pin that clocks the USI from the MCU to achieve an accurate data transfer. The fre-
quency of the internal RC oscillator is affected by ambient temperature and operating voltage.
The USI provides 2 two serial synchronous data transfer modes, with different physical I/O ports
for the data output. The two wire mode is used for ASK and the three wire mode is used for FSK.
Table 3-1. Typical Current Consumption in Active Mode at 3.0V and 25°C
Type
Transmitter
Microcontroller (4 MHz
Internal RC Oscillator)
ATA5771
8.5 mA
0.8 mA
ATA5773
9.0 mA
0.8 mA
ATA5774
9.0 mA
0.8 mA
Total
9.3 mA
9.8 mA
9.8 mA
9137B–RKE–02/09
Table 3-2. Current Consumption in Power-down Mode at 3.0V and –40°C to +85°C
Type
Transmitter
Microcontroller
(Watchdog Timer
Disabled)
Total
ATA5771
ATA5773
ATA5774
Typ. < 10 nA
Max. 350 nA
Typ. 200 nA
Max. 24 µA(1)
Typ. < 210 nA
Max. 24.35 µA(1)
Note: 1. Maximum value measured in final test at 125°C. Value at 85°C: See Appendix 4, page 196,
Figure 23-12 “Power Down Supply Current versus VCC”
5
Free Datasheet http://www.datasheet4u.com/
5 Page 
ATA5771/ATA5773/ATA5774
Figure 6-2. Typical FSK Application ATA5771/ATA5773/ATA5774
VCC
68 nF
VCC
24 23 22 21 20 19
1
VCC
2
PB0
3
PB1
4
PB3/RESET
5
PB2
6
PA7
ATA577x
18
PA0
17
PA1
16
PA2
15
PA3/T0
14
PA4/SCK
13
PA5/MISO
SW1
SW2
SW3
7 8 9 10 11 12
RF Choke
VCC
9137B–RKE–02/09
11
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet ATA5774.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| ATA5771 | (ATA5771 - ATA5774) Microcontroller | ATMEL Corporation |
| ATA5771C | UHF ASK/FSK Transmitter | ATMEL Corporation |
| ATA5773 | (ATA5771 - ATA5774) Microcontroller | ATMEL Corporation |
| ATA5773C | UHF ASK/FSK Transmitter | ATMEL Corporation |
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