Atmel ATA5283 User Manual

Features  
Wake-up Function for a Microcontroller with Preamble Detection  
1 mVrms Sensitivity  
1 µA Standby Current  
Power Supply: 2V to 3.8V  
Baud Rate: up to 4 kbps (ASK Modulation)  
Operation Temperature: up to 125°C  
Withstands +175°C  
Few External Components  
Interface IC for  
125 kHz  
Application  
Tire Pressure Monitoring (TPM)  
Wake-up  
Function  
1. Description  
The ATA5283 is a 125 kHz ultra-low power receiver used for the wake-up function of  
Tire Pressure Monitoring (TPM) application. The sensitive input stage of the IC ampli-  
fies and demodulates the carrier signal from the antenna coil to a digital output signal  
for a microcontroller. During the standby mode the preamble detection unit monitors  
the incoming signal and activates the wake-up output and the data output, if the IC  
receives a proper 125 kHz carrier signal.  
ATA5283  
By combining the IC with an antenna coil, a microcontroller, an RF transmitter/trans-  
ceiver, a battery, temperature- and pressure sensor, it is possible to design a  
complete Tire Pressure Monitoring system (TPM).  
Figure 1-1. Block Diagram  
Battery  
VDD  
ATA5283  
Lx  
Amplifier  
with AGC  
COIL  
RESET  
Vref  
N_WAKEUP  
N_DATA  
Condi-  
tioner  
Preamble  
check  
TST1  
TST2  
GND  
4598H–AUTO–03/07  
ATA5283  
3. Functional Description  
The ATA5283 is an ultra-low power ASK receiver. Without a carrier signal it operates in the  
standby listen mode. In this mode it monitors the coil input with a very low current consumption.  
To activate the IC and the connected control unit, the transmitting stage must send the preamble  
carrier burst. After a preamble is detected the IC is activated. It adapts the gain of the input stage  
and enables the wake-up and the data output. The first gap at the end of the preamble gener-  
ates a wake-up signal for the microcontroller. After that the receiver outputs the data signal at  
N_DATA. To return the IC into the standby listen mode it must be reset via the RESET input.  
3.1  
3.2  
AGC Amplifier  
The input stage contains an Automatic Gain Control (AGC) amplifier to amplify the input signal  
from the coil. The gain is adjusted by the automatic gain control circuit if a preamble signal is  
detected. The high dynamic range of the AGC enables the IC to operate with input signals from  
1 mVrms to 1.1Vrms. After the AGC settling time the amplifier output delivers a 125 kHz signal with  
an amplitude adjusted for the following evaluation circuits’ preamble detection, signal condi-  
tioner, wake-up.  
Preamble Detection  
Before data transmission the IC stays in standby listen mode. To prevent the circuit from unin-  
tended operations in a noisy environment the preamble detection circuit checks the input signal.  
A valid signal is detected by a counter after 192 carrier periods without interrupts. Short inter-  
rupts which are suppressed by the signal conditioner are tolerated. When a valid carrier  
(preamble) is found the circuit starts the automatic gain control. It requires up to 512 carrier peri-  
ods to settling. The complete preamble should have 704 carrier periods minimum. The preamble  
is terminated and the data transfer is started with the first gap (Start Gap) in the carrier (see Fig-  
ure 3-1).  
Figure 3-1. Communication Protocol  
Preamble  
Start  
gap  
Procedure  
> 5.64 ms  
Data  
192 Periods  
of LF  
> 512 Periods  
of LF  
Signal  
N_DATA  
N_WAKEUP  
RESET  
Gain  
control  
No gain  
control  
AGC  
adjustment  
Gain control  
active  
No gain  
control  
Current  
profile  
2 µA  
0.5 µA  
1 µA  
3
4598H–AUTO–03/07  
 
3.3  
Automatic Gain Control  
For a correct demodulation the signal conditioner needs appropriate internal signal amplitude.  
To control the input signal the ATA5283 has a build in digital AGC. The gain control circuit regu-  
lates the internal signal amplitude to the reference value (Ref2, Figure 3-2). It decreases the  
gain by one step if the internal signal exceeds the reference level for two periods and it  
increases the gain by one step if eight periods do not achieve the reference level. In the standby  
listen mode the gain is reset to the maximum value. If a valid preamble signal (192 valid carrier  
clocks) is detected the automatic gain control is activated.  
Note:  
With the variation of the gain the coil input impedance changes from high impedance to minimal  
143 kbecause of the internal regulator circuit (see Figure 3-8 on page 8).  
Figure 3-2. Automatic Gain Control  
Transmitted  
signal  
Coil  
input  
Gain control  
reference  
Ref. 2  
Gap detection Ref. 1  
reference  
100%  
50%  
Gain controlled  
signal  
Internal comparator  
signal  
N_DATA  
4
ATA5283  
4598H–AUTO–03/07  
 
ATA5283  
3.4  
Signal Conditioner  
The signal conditioner demodulates the amplifier output signal and converts it to a binary signal.  
It compares the carrier signal with the 50% reference level (see Ref1 in Figure 3-3) and delivers  
a logical 1, if the carrier signal stays below the reference and a logical 0, if it exceeds the refer-  
ence level. A smoothing filter suppress the space between the half-waves as well as a few  
missing periods in the carrier and glitches during the gaps.  
The output signal of the signal conditioner is used as the internal data signal for the data output,  
the wake-up logic and the preamble detection.  
The timing of the demodulated data signal is delayed related to the signal at the transmitting  
end. This delay is a function of the carrier frequency, the behavior of the smoothing filter and the  
antenna Q-factor. The smoothing filter causes a delay of 3 to 6 periods (see tb and td in Figure  
3-3). The rest of the delay is caused by the build-up time of the antenna signal and is condi-  
tioned on the Q-factor (see ta and tc in Figure 3-3).  
Figure 3-3. Output Timing  
Ref.2  
100%  
50%  
Ref.1  
Coil  
input  
Comparator  
output  
N_DATA  
t
t
c
b
t
t
a
d
t
t
OFF  
ON  
The following diagrams show the delay of the data signal as a function of the antenna Q-factor.  
Figure 3-4. Turn On Delay Time (tON) versus Antenna Q-Factor  
250  
f
= 125 kHz  
field  
200  
150  
typ.  
max.  
min.  
100  
50  
0
0
10  
20  
30  
40  
50  
Q-factor  
5
4598H–AUTO–03/07  
 
Figure 3-5. Turn Off Delay Time (toff) versus Antenna Q-Factor  
200  
180  
160  
140  
120  
f
= 125 kHz  
field  
typ.  
max.  
100  
80  
60  
min.  
40  
20  
0
0
10  
20  
30  
40  
50  
Q-factor  
3.5  
3.6  
3.7  
Data Output  
The data output N_DATA outputs the demodulated and digitized LF signal according to the  
envelope of the antenna input signal. In the standby mode the N_DATA output is disabled and  
set to level 1. It is enabled by the wake-up signal and it outputs 1 level if the IC detects the car-  
rier signal and a 0 level during the gaps (see Figure 3-1 on page 3).  
As the circuit does not check the received data (except the preamble), it is up to the user to  
choose the kind of encoding (pulse distance, Manchester, bi-phase...) wanted.  
Wake-up Signal  
ble signal and has left the standby mode. It can be used as a wake-up or a chip select signal for  
an external device (see Figure 3-1 on page 3).  
After a preamble is detected the first valid gap (Start Gap) sets the N_WAKEUP output to low  
and enables the data output N_DATA. The N_WAKEUP holds the low level until the IC is reset  
to the standby mode by a reset signal.  
Reset  
The IC is reset either by the internal POR circuit during a power on sequence or by a high pulse  
at the RESET pin. After the reset all internal counters are in the initial state and the IC is in the  
standby listen mode.  
The POR circuit generates a reset while the supply voltage VDD is below the power on reset  
threshold VPOR and release the function of the IC if VDD exceeds this threshold.  
A high signal at the RESET pin resets the complete circuit. If the IC is activated a reset signal is  
necessary to activate the standby listen mode.  
The RESET pin can also be used to hold the IC in a power down state. In this state the IC is out  
of operation and the current consumption is below the standby current.  
Note:  
The RESET pin is high impedance CMOS input. To avoid floating effects like undefined input  
states and malfunctions it should not be open.  
6
ATA5283  
4598H–AUTO–03/07  
ATA5283  
3.8  
3.9  
Standby Listen Mode  
In the standby listen mode the IC monitors the coil input with a very low current consumption.  
The automatic gain control is switched off and the gain is set to the maximum value. The  
N_DATA and the N_WAKEUP output are set to a high level.  
Before the controller enters its standby mode after the communication, it should activate the  
standby listen mode of the ATA5283 with a reset signal. This measure ensures that the IC  
enters the power saving standby mode and that the IC wakes the controller correctly with the  
next preamble signal.  
Applications  
Figure 3-6 shows a typical TPM application of the ATA5283. Combined with the antenna reso-  
nant circuit the ATA5283 is used as wake-up receiver for the microcontroller and the connected  
temperature- and pressure-sensor.  
Note:  
To avoid supply voltage ripples to affect the microcontroller, an RC filter (R1 = 100, C1 = 10 nF)  
is recommended.  
Figure 3-6. Application  
R1  
C1  
125 kHz  
8
ATA5283  
Temp.  
sensor  
Amplifier  
with  
RESET  
5
AGC  
LA  
CA  
Central  
board  
Antenna  
driver  
1
Micro  
controller  
N_WAKEUP  
N_DATA  
7
6
controller  
ATA5275  
Pressure  
sensor  
Vref  
2
3
4
UHF Rx  
T5743  
UHF Tx  
433 kHz  
ATAR862  
7
4598H–AUTO–03/07  
 
Figure 3-7. Pin Connection and Pin Protection  
ATA5283  
COIL_X  
TST1  
TST2  
VSS  
1
2
3
4
8
7
6
5
VDD  
Divider impedance  
143 kto 5 MΩ  
VDD  
VDD  
N_WAKEUP  
N_DATA  
RESET  
2 kΩ  
2 kΩ  
1 kΩ  
VDD  
VDD  
VDD  
VDD  
Figure 3-8. Coil Input Impedance  
10000  
max.  
typ.  
min.  
1000  
100  
1
10  
100  
1000  
10000  
Coil Input Signal (mVpp  
)
8
ATA5283  
4598H–AUTO–03/07  
 
ATA5283  
4. Absolute Maximum Ratings  
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating  
only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this  
specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.  
Parameters  
Symbol  
VDD  
VIN  
Value  
Unit  
V
Power supply  
–0.3 to +6.5  
Input voltage (except coil inputs)  
Input current coil  
VSS – 0.3 < VIN < VDD + 0.3  
V
ICI  
10  
mA  
V
Input voltage coil  
VCI  
VDD – 3.5 < VCI < VDD + 3.5  
ESD protection (human body)  
Operating temperature range  
Withstanding 175°C  
Storage temperature range  
Soldering temperature  
VESD  
Tamb  
tTEMP  
Tstg  
4
kV  
°C  
min.  
°C  
°C  
–40 to +125  
30  
–40 to +150  
260  
Tsld  
5. Thermal Resistance  
Parameters  
Symbol  
Value  
Unit  
Thermal resistance junction ambient  
RthJA  
210  
K/W  
6. Operating Range  
Parameters  
Symbol  
VDD  
Value  
2 to 3.8  
Unit  
V
Power supply range  
Operating temperature range  
TOP  
–40 to +125  
°C  
9
4598H–AUTO–03/07  
7. Electrical Characteristics  
VSS = 0V, VDD = 2V to 3.8V, Tamb = –40°C to +105°C, characterized up to 125°C, unless other specified  
No. Parameters  
Test Conditions  
Pin  
Symbol  
Min.  
Typ.  
Max.  
Unit  
Type*  
1
Power Supply and Coil Limiter  
1.1  
Power supply  
8
VDD  
2
3.2  
3.8  
0.8  
0.8  
0.8  
1.0  
1.5  
V
A
A
A
C
A
C
Reset supply current –40  
Reset supply current +25  
Reset supply current +85  
Reset supply current +105  
Reset supply current +125  
µA  
µA  
µA  
µA  
µA  
1, 2, 3,  
8
1.2  
IDDR  
0.4  
Supply current  
(standby listen mode) –40  
1.4  
1.5  
1.6  
1.6  
1.7  
4.0  
4.1  
4.2  
4.2  
4.2  
µA  
µA  
µA  
µA  
µA  
µA  
µA  
µA  
µA  
µA  
Vp  
Vp  
Vp  
A
A
C
A
C
A
A
C
A
C
A
A
A
Supply current  
(standby listen mode) +25  
Supply current  
(standby listen mode) +85  
1, 2, 3,  
8
1.3  
IDDL  
1.1  
Supply current  
(standby listen mode) +105  
Supply current  
(standby listen mode) +125  
Supply current with carrier  
(AGC active) –40  
Supply current with carrier  
(AGC active) +25  
Supply current with carrier  
(AGC active) +85  
1,2, 3,  
8
1.4  
IDD  
2
Supply current with carrier  
(AGC active) +105  
Supply current with carrier  
(AGC active) +125  
ICI  
VDD = 2V  
ICI 1 mA  
VDD = 3.2V  
ICI 1 mA  
=
1 mA  
1.4  
1.6  
1.8  
Coil input voltage referred to  
VDD (Input coil limiter for  
channels X, Y, Z)  
=
1.5  
1-3  
VC  
=
VDD = 3.8V  
2
Amplifiers  
2.1  
2.2  
2.3  
2.4  
2.5  
Wake-up sensitivity  
Bandwidth  
125 kHz input signal  
Without coil  
7
6
6
6
1
VSENS  
BW  
fu  
1
2.2  
mVrms  
kHz  
kHz  
kHz  
kΩ  
A
C
C
C
A
150  
180  
30  
Upper corner frequency  
Lower corner frequency  
Input impedance  
Without coil  
Without coil  
fo  
f = 125 kHz  
RIN  
143  
VIN 1 mVrms at  
125 kHz  
2.6  
Input capacitance  
1
CIN  
10  
pF  
C
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter  
10  
ATA5283  
4598H–AUTO–03/07  
ATA5283  
7. Electrical Characteristics (Continued)  
VSS = 0V, VDD = 2V to 3.8V, Tamb = –40°C to +105°C, characterized up to 125°C, unless other specified  
No. Parameters  
Test Conditions  
Pin  
Symbol  
Min.  
Typ.  
Max.  
Unit  
Type*  
3
Automatic Gain Control  
VIN 3 mVrms at  
3.1  
Preamble detection time  
AGC adjustment time  
tDAGC  
192  
Periods  
B
125 kHz  
f = 125 kHz  
VIN = 1 mVrms  
tAGC  
tAGC  
tAGC  
tAGC  
tAGC  
0
48  
220  
292  
450  
3.2  
VIN = 3 mVrms  
VIN = 30 mVrms  
VIN = 100 mVrms  
VIN = 1Vrms  
Periods  
C
512  
20  
Signal change rate  
(gap detection)  
Coil input signal 100%  
to 37% (τ)  
3.3  
3.4  
1
1
1
tEOS  
tCORR  
tCORR  
Periods  
Periods  
Periods  
C
C
C
Coil input signal:  
50 to 100% changing  
52  
AGC correction time  
(no gap detection)  
Coil input signal:  
100 to 50% changing  
208  
3.5  
3.6  
3.7  
4
Data rate (Q < 20)  
125 kHz ASK  
DR  
tON  
4
Kb/s  
µs  
A
A
A
Delay time RF signal to data 125 kHz ASK  
Delay time RF signal to data 125 kHz ASK  
Interface  
40  
40  
tOFF  
µs  
0.8 ×  
4.1  
Reset input level high  
5
5
5
VHRESET  
tRESET  
VDD  
V
µs  
V
A
A
C
VDD  
4.1.1 Reset pulse width  
VRESET = VDD  
20  
0.2 ×  
VDD  
4.2  
4.3  
4.4  
Reset input level low  
VLRESET  
0
Reset input leakage current  
low  
V
RESET = VSS  
RESET = VDD  
5
5
IIL  
-0.2  
0
0
µA  
µA  
A
A
Reset input leakage current  
high  
V
IIH  
0.2  
0.8 ×  
4.5  
4.6  
4.7  
N_WAKEUP output level high INWAKEUP = –100 µA  
N_WAKEUP output level low INWAKEUP = 100 µA  
7
7
6
6
VHNWAKE  
VLNWAKE  
VHNDATA  
VLNDATA  
VDD  
V
V
V
V
A
A
A
A
VDD  
0
0.2 × VDD  
VDD  
0.8 ×  
VDD  
N_DATA output level high  
IN_DATA = –100 µA  
IN_DATA = 100 µA  
4.8  
5
N_DATA output level low  
0
0.2 × VDD  
Power Supply and Reset  
5.1  
V
DD power on reset threshold  
VPOR  
tPON  
TSbydel  
tRST  
1
1.5  
1.9  
V
A
C
Switch on VDD to circuit  
active  
5.2  
5.2.1  
5.3  
Power-up time  
100  
ms  
Standby reactivation delay  
after pulse reset  
f = 125 kHz  
800  
200  
µs  
µs  
C
C
RESET reactivation caused by  
negative spikes on VDD  
tBDN = 500 ns  
7
10  
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter  
11  
4598H–AUTO–03/07  
8. Ordering Information  
Extended Type Number  
Package  
TSSOP8L  
TSSOP8L  
Remarks  
ATA5283P-6AQJ  
5000 pieces, taped and reeled, Pb-free  
500 pieces, taped and reeled, Pb-free  
ATA5283P-6APJ  
9. Package Information  
Package: TSSOP 8L  
Dimensions in mm  
3 0.1  
3 0.1  
+0.06  
3.8 0.3  
4.9 0.1  
0.31-0.07  
0.65 nom.  
3 x 0.65 = 1.95 nom.  
8
5
4
technical drawings  
according to DIN  
specifications  
1
Drawing-No.: 6.543-5083.01-4  
Issue: 2; 15.03.04  
12  
ATA5283  
4598H–AUTO–03/07  
ATA5283  
10. 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.  
History  
4598H-AUTO-03/07  
Number 5.2.1 in section 7 “Electrical Characteristics” on page 11 added  
Put datasheet in a new template  
Pb-free logo on page 1 deleted  
4598G-AUTO-01/07  
4598F-AUTO-09/05  
Put datasheet in a new template  
Pb-free logo on page 1 added  
Heading Rows on Table “Absolute Maximum Ratings” on page 9 added  
Ordering Information on page 12 changed  
13  
4598H–AUTO–03/07  
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4598H–AUTO–03/07  

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