ATA5795C - Summary

ATA5795C
Embedded AVR Microcontroller Including RF Transmitter
and Immobilizer LF Functionality for Remote Keyless
Entry
DATASHEET
Features
● System solution for immobilizer and remote keyless entry functionality
● Optional integrated open source immobilizer software stack supports automotive
immobilizer applications (CMMI certified)
● Integrated ultra-low power flash Atmel® AVR® (8-bit) microcontroller
● 2112-byte EEPROM
● 32-bit unique device identification number
● Available in small 5x5 QFN32 pin package
Contactless Transponder
● LF contactless transponder operation in passive and active modes
● Integrated codecs for enhanced LF communication range
● Ultra low-power AES-128 cryptographic engine for use of immobilizer and RKE
applications
● Access protected area for two 128-bit secret keys for device authentication
● Optional one 128-bit transport key for initial configuration
● LF receiver data integrity check (CRC-4/CRC-8)
RF Transmitter
● Fully integrated fractional-N PLL, VCO and loop filter covering 315MHz and
433MHz (software programmable)
● Output power programmable from –0.5 to +12.5dBm
● Supports ASK and FSK modulation with data rate up to 40Kbit/s
● Extended battery lifetime due to fast start-up time, low operating voltage and low
supply current
This is a summary document.
The complete document is
available under NDA. For more
information, please contact
your local Atmel sales office.
9182ES-RKE-11/14
Ultra-low-power AVR Microcontroller
● 8Kbyte flash program memory (including 2KB of immobilizer software stack)
● 2112-byte EEPROM – includes protected user data and device configuration data (64Bytes)
● Error correction code (ECC) engine protects flash and EEPROM
● 512Bytes of SRAM
● Four GP timers
●
●
●
●
T0: Flexible WD and interval timers
T1: 15-bit interval timer
T2: Asynchronous 8-bit timer/counter with output compare
T3: Asynchronous 8-bit timer/counter with output compare and input capture
● Power management unit
● System clock management and monitoring functions
● POR and brown-out detection
● Programmable voltage monitor
● RTC and two internal system clock RC oscillators with f1 = 125kHz, f2 = 4MHz
● SPI, TM/SSI, IR digital interfaces; dW 1-wire debug IF with AVR development tools
● Very low power consumption:
●
●
●
●
Active: 50µA (Sys_Clk at 125kHz)
Idle: < 70µA (Sys_Clk at 1MHz)
Power-down: 0.8µA
EE(wr): 50µA
● Wide battery voltage range from 1.9 to 3.6V (in contact mode)
● –40 to +85°C operation temperature
● Automotive grade C compiler
2
ATA5795C [DATASHEET]
9182ES–RKE–11/14
1.
Description
Atmel® ATA5795C is a smart remote keyless entry (RKE) device that includes an embedded ultra-low-power AVR® 8-bit
microcontroller, a fractional-N RF transmitter and an LF immobilizer interface in a single QFN32 package.
Furthermore, the device has an integrated AES-128 cryptography hardware engine, which is accessible by both the
immobilizer and the RKE unit. The immobilizer interface can run in contactless mode, allowing energy supply and data
transmission via the LF link.
The Atmel ATA5795C is designed for automotive applications that necessitate both immobilization and remote keyless entry
functions in one single key. It conforms to requirements of extremely low power consumption and provides all the necessary
circuitry for the entire application.
1.1
System Block Diagram
Figure 1-1. System Block Diagram
Key
Battery
Car
VBAT
RF
CBUF
AVR
T-Coil
16 15 14 13 12 11 10 9
17
8
18
7
19
6
RF-Receiver:
5
ATA5723/24/28
ATA5780
20
21
RFLoop antenna
ATA5795C
4
22
3
23
2
24
1
25 26 27 28 29 30 31 32
Transponder
Base Station:
U2270, ATA5272
ATA5795C [DATASHEET]
9182ES–RKE–11/14
3
1.2
Atmel ATA5795C Block Diagram
A4P
A4N
Power
Management
SPI
AFE
EEPROM/
2.1KB
Contactless
Interface/
Transponder
VSRF
VCC
VBAT
Figure 1-2. Atmel ATA5795C Block Diagram
ECIN
FRC-Oscillator
Clock
Management
and
Monitoring
RTC
XTO
XTO1
XTO2
Frac.-N
PLL
PC0
Watchdog
Oscillator
Volt. Monitor
PD7/TM3
RF-Transmitter
AVR-Core
VCO
PD6/TM2
PD5/TM1
Watchdog
Timer
IR-Driver
PD3
PD1/T3ICP
SRAM/512B
Flash/8KB
Timer Block
PD0/INT0
PB0/NSS
TME
PB1/SCK
PB7
IO-Ports
GND
PB2/MOSI
PB6
PB4/TM4
PB3/MISO
CRC-Module
XTO2
1.3
PB5/TM5
Crypto Unit
PB7
XTAL1
Digital
Control
DebugWIRE
PB6
XTAL2
Pin Configurations
PB2
PB1
ANT2
ANT1
PB0
Figure 1-3. Pin Out for QFN 32 Package
32 31 30 29 28 27 26 25
TME
1
24
PB3
XTO1
2
23
PD3
VSRF
3
22
PD4
GNDRF
4
21
PD5
NRESET
5
20
PD6
PC0
6
19
PD7
A4N
7
18
PB4
A4P
8
17
PB5
Atmel
ATA5795C
ATA5795C [DATASHEET]
9182ES–RKE–11/14
XTAL2
GND
VCC
XTAL1
PD2
PD1
PD0
VBAT
9 10 11 12 13 14 15 16
4
Power
Amplifier
POR/BOD
and
Reset
NRESET(DW)
PD2/TEI
GNDRF
PD4/ECIN0
ANT1
ANT2
Table 1-1.
Pin Description
Pin
Number
Pin Name
Alternate
Function 1
Alternate
Function 2 Function
1
TME
-
-
Test mode enable
2
XTO1
-
-
Connection for RF crystal
RF - pin
3
VSRF
-
-
Power supply voltage RF
RF - pin
4
GNDRF
-
-
Power supply ground RF
RF - pin
5
NRESET
dW
-
Reset input / debugWire interface
6
PC0
-
-
I/O port
7
A4N
-
-
Input pin for transponder AFE
8
A4P
-
-
Input pin for transponder AFE
9
VBAT
-
-
Power supply voltage for battery
10
PD0
INT0
PCINT8
I/O port / external interrupt input 0
Port D0
11
PD1
T3ICP
PCINT9
I/O port / timer 3 external capture input
Port D1
12
PD2
TEI
PCINT10
I/O port / external timer input clock
Port D2
Comment
Port C0
13
VCC
-
-
Power supply voltage for the microcontroller.
A capacitor with capacitance CBUF must be
connected at this pin to buffer the voltage during
field supply and block the microcontroller VCC.
14
XTAL1
-
-
32kHz crystal oscillator input pin
15
GND
-
-
Power supply ground
16
XTAL2
-
-
32kHz crystal oscillator output pin
17
PB5
TM5
PCINT5
I/O port / timer modulator pin 5
Port B5
18
PB4
TM4
PCINT4
I/O port / timer modulator pin 4
Port B4
19
PD7
TM3
PCINT15
I/O port / timer modulator pin 3
Port D7
20
PD6
TM2
PCINT14
I/O port / timer modulator pin 2
Port D6
21
PD5
TM1
PCINT13
I/O port / timer modulator pin 1
Port D5
22
PD4
ECIN0
PCINT12
I/O port / external clock input 0
Port D4
23
PD3
-
PCINT11
I/O port
Port D3
24
PB3
MISO
PCINT3
I/O port / SPI
Port B3
25
PB2
MOSI
PCINT2
I/O port / SPI
Port B2
26
PB1
SCK
PCINT1
I/O port / SPI
Port B1
27
ANT2
-
-
RF antenna 2
RF - pin
28
ANT1
-
-
RF antenna 1
RF - pin
29
PB0
NSS
PCINT0
I/O port / SPI
Port B0
30
PB7
-
PCINT7
I/O port
Port B7
31
PB6
-
PCINT6
I/O port
Port B6
32
XTO2
-
-
Connection for RF crystal
RF - pin
ATA5795C [DATASHEET]
9182ES–RKE–11/14
5
2.
Ordering Information
Extended Type Number
Package
ATA5795C-PNQW
3.
Remarks
QFN32 - 5x5
Pb-free, 6k
Package Information
Top View
D
32
1
technical drawings
according to DIN
specifications
E
PIN 1 ID
8
A
Side View
A3
A1
Dimensions in mm
Bottom View
D2
9
16
17
E2
8
1
Z
24
32
e
25
COMMON DIMENSIONS
(Unit of Measure = mm)
L
Z 10:1
b
Symbol
MIN
NOM
MAX
A
0.8
0.85
0.9
A1
A3
0
0.16
0.035
0.21
0.05
0.26
D
4.9
5
5.1
D2
3.5
3.6
3.7
E
4.9
5
5.1
E2
3.5
3.6
3.7
L
0.35
0.4
0.45
b
e
0.2
0.25
0.5
0.3
NOTE
05/20/14
TITLE
Package Drawing Contact:
[email protected]
6
ATA5795C [DATASHEET]
9182ES–RKE–11/14
Package: QFN_5x5_32L
Exposed pad 3.6x3.6
GPC
DRAWING NO.
REV.
6.543-5203.01-4
1
4.
Revision History
Please note that the following page numbers referred to in this section refer to the specific revision mentioned, not to this
document.
Revision No.
9182ES-RKE-11/14
History
• Section 2 “Ordering Information” on page 6 updated
• Section 3 “Package Information” on page 6 updated
9182DS-RKE-04/14
• Put datasheet in the latest template
9182CS-RKE-11/11
• ATA5795 to ATA5795C renamed
9182BS-RKE-07/11
• Document completely redesigned
ATA5795C [DATASHEET]
9182ES–RKE–11/14
7
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© 2014 Atmel Corporation. / Rev.: 9182ES–RKE–11/14
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