ATA5771.pdf 데이터시트 (총 30 페이지) - 파일 다운로드 ATA5771 데이타시트 다운로드

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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/

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Figure 1-1. ASK System Block Diagram
UHF ASK/FSK
Remote Control Transmitter
S1 PXY
S1 PXY
S1 PXY
PXY
PXY
PXY
PXY
ATA5771/73/74
ATtiny44V
VDD
GND
PXY
PXY
PXY
PXY
PXY
VS
T5750
T5753
T5754
Power
up/down
f/4 PLL
CLK
XTO
VCO
PA
ENABLE
GND_RF
VCC_RF
VS
PA_ENABLE
ANT2
ANT1
Antenna
Loop
Antenna
UHF ASK/FSK
Remote Control Receiver
ATA5760
ATA5761
ATA5723
ATA5724
ATA5728
ATA5745
ATA5746
Demod
Control
PLL XTO
LNA
VCO
1 to 6 Micro-
controller
VS
2 ATA5771/ATA5773/ATA5774
9137B–RKE–02/09
Free Datasheet http://www.datasheet4u.com/

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ATA5771/ATA5773/ATA5774
Figure 1-2. FSK System Block Diagram
UHF ASK/FSK
Remote Control Transmitter
S1 PXY
S1 PXY
S1 PXY
PXY
PXY
PXY
PXY
ATA5771/73/74
ATtiny44V
VDD
GND
PXY
PXY
PXY
PXY
PXY
VS
T5750
T5753
T5754
Power
up/down
f/4 PLL
CLK
XTO
VCO
PA
ENABLE
GND_RF
VCC_RF
VS
PA_ENABLE
ANT2
ANT1
Antenna
Loop
Antenna
UHF ASK/FSK
Remote Control Receiver
ATA5760
ATA5761
ATA5723
ATA5724
ATA5728
ATA5745
ATA5746
Demod
Control
PLL XTO
LNA VCO
1 to 6 Micro-
controller
VS
9137B–RKE–02/09
3
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2. Pin Configuration
Figure 2-1. Pinning QFN24 5 mm x 5 mm
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 Function
VCC
Microcontroller supply voltage
PB0 Port B is a 4-bit bi-directional I/O port with internal pull-up resistor
PB1 Port B is a 4-bit bi-directional I/O port with internal pull-up resistor
PB3/RESET Port B is a 4-bit bi-directional I/O port with internal pull-up resistor/reset input
PB2 Port B is a 4-bit bi-directional I/O port with internal pull-up resistor
PA7 Port A is a 4-bit bi-directional I/O port with internal pull-up resistor
PA6 / MOSI Port A is a 4-bit bi-directional I/O port with internal pull-up resistor
CLK
Clock output signal for microcontroller. The clock output frequency is set by the crystal to fXTAL/4
PA_ENABLE Switches on power amplifier, used for ASK modulation
ANT2
Emitter of antenna output stage
ANT1
Open collector antenna output
GND
Ground
PA5/MISO Port A is a 4-bit bi-directional I/O port with internal pull-up resistor
PA4/SCK Port A is a 4-bit bi-directional I/O port with internal pull-up resistor
PA3/T0 Port A is a 4-bit bi-directional I/O port with internal pull-up resistor
PA2 Port A is a 4-bit bi-directional I/O port with internal pull-up resistor
PA1 Port A is a 4-bit bi-directional I/O port with internal pull-up resistor
PA0 Port A is a 4-bit bi-directional I/O port with internal pull-up resistor
GND
Microcontroller ground
XTAL
Connection for crystal
VS_RF Transmitter supply voltage
GND_RF Transmitter ground
ENABLE Enable input
GND
Ground
GND
Ground/backplane (exposed die pad)
4 ATA5771/ATA5773/ATA5774
9137B–RKE–02/09
Free Datasheet http://www.datasheet4u.com/

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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
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