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PDF ATA5283 Data sheet ( Hoja de datos )
| Número de pieza | ATA5283 | |
| Descripción | Interface IC for 125 kHz Wake-up Function | |
| Fabricantes | ATMEL Corporation | |
| Logotipo |  |
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Features
• Wake-up Function for a Microcontroller with Preamble Detection
• 1 mVrms Sensitivity
• 1 µA Standby Current
• Power Supply: 2 V to 3.8 V
• Baud Rate: up to 4 kbps (ASK Modulation)
• Operation Temperature: up to 125°C
• Withstands +175°C
• Few External Components
Application
• Tire Pressure Monitoring (TPM)
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.
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. Block Diagram
Interface IC for
125 kHz
Wake-up
Function
ATA5283
Preliminary
Battery
Lx
Amplifier
with AGC
COIL
VDD
ATA5283
RESET
Vref
TST1
TST2
Condi-
tioner
Preamble
check
N_WAKEUP
N_DATA
GND
Rev. 4598D–AUTO–03/04
1 page  
Signal Conditioner
ATA5283 [Preliminary]
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 5) and delivers a logical 1, if the carrier signal stays below the reference and a
logical 0, if it exceeds the reference level. A smoothing filter suppress the space
between the half-waves as well as a few missing periods in the carrier and glitches dur-
ing 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 trans-
mitting 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 5). The rest of the delay is caused by the build-up time
of the antenna signal and is conditioned on the Q-factor (see ta and tc in Figure 5).
Figure 5. Output Timing
Ref.2
100%
Ref.1
Coil
input
50%
Comparator
output
N_DATA
ta tb
tON
tc td
tOFF
4598D–AUTO–03/04
5
5 Page 
ATA5283 [Preliminary]
Electrical Characteristics (Continued)
VSS = 0 V, VDD = 2 V to 3.8 V, Tamb = -40° C to +105°C, characterized up to 125°C, unless other specified
No. Parameters
Test Conditions
Pin Symbol Min. Typ. Max.
Unit
4 Interface
4.1 Reset input level high
4.1.1 Reset pulse width
4.2 Reset input level low
VRESET = VDD
4.3
Reset input leakage current
low
VRESET = VSS
5
VHRESET
0.8 ×
VDD
5
tRESET
20
5 VLRESET 0
5 IIL -0.2
VDD
0.2 ×
VDD
0
V
µs
V
µA
4.4
Reset input leakage current
high
VRESET = VDD
5 IIH 0
0.2 µA
4.5
N_WAKEUP output level
high
INWAKEUP = -100 µA
4.6 N_WAKEUP output level low INWAKEUP = 100 µA
4.7 N_DATA output level high
IN_DATA = -100 µA
4.8 N_DATA output level low
5 Power Supply and Reset
IN_DATA = 100 µA
7
VHNWAKE
0.8 ×
VDD
7 VLNWAKE 0
6
VHNDATA
0.8 ×
VDD
6 VLNDATA 0
VDD
0.2 ×
VDD
VDD
0.2 ×
VDD
V
V
V
V
5.1
VDD power on reset
threshold
VPOR
1 1.5 1.9
V
5.2 Power-up time
Switch on VDD to
circuit active
tPON
100 ms
5.3
RESET reactivation caused
by negative spikes on VDD
tBDN = 500 ns
7
tRST
10
200 µs
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Type*
A
A
C
A
A
A
A
A
A
A
C
C
4598D–AUTO–03/04
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet ATA5283.PDF ] | |
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