ata6285n ATMEL Corporation, ata6285n Datasheet - Page 10

• Manufacturer Part Number: ata6285n
• Description: Tpms Control And Transmitter Ic
• Manufacturer: ATMEL Corporation

4. UHF ASK/FSK Transmitter for ATA6285N/ATA6286N
4.1
4.2
4.3
Figure 4-1.
10
Features
Benefits
Description
1 Li cell
Keys
ATA6285N/ATA6286N [Preliminary]
System Block Diagram
ATARx9x
Encoder
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The ATA6285N/ATA6286N is a PLL transmitter part which has been developed for the demands
of RF low-cost transmission systems at data rates up to 20 Kbits/s Manchester coding and
40 Kbits/s NRZ coding. The transmitting frequency range is 313 MHz to 317 MHz (ATA6285N)
and 432 MHz to 448 MHz (ATA6286N), respectively. It can be used in both FSK and ASK sys-
tems. Due to its shorten crystal oscillator settling time it is well suited for Tire Pressure
Monitoring (TPMS) and for Passive Entry Go applications.
PLL Transmitter IC with Single-ended Output
High output Power (6 dBm) at 8.1 mA (315 MHz) and 8.5 mA (433 MHz) Typical Values
Divide by 24 (ATA6285N) and 32 (ATA6286N) Blocks for 13 MHz Crystal Frequencies and for Low
XTO Start-up Times
Modulation Scheme ASK/FSK with Internal FSK Switch
Up to 20 Kbits/s Manchester Coding, Up to 40 Kbits/s NRZ Coding
Power-down Idle and Power-up Modes to Adjust Corresponding Current Consumption through
ASK/FSK/Enable Input Pins
ENABLE Input for Parallel Usage of Controlling Pins in a 3-wire Bus System
CLK Output Switches ON if the Crystal Current Amplitude Has Reached 35% to 80% of its Final
Value
Crystal Oscillator Time until CLK Output Is Activated, Typically 0.6 ms
Low Parasitic FSK Switch Integrated
Very Short and Reproducible Time to Transmit Typically < 0.85 ms
13.125 MHz/13.56 MHz Crystals Give Opportunity for Small Package Sizes
UHF ASK/FSK TPM
Transmitter Part of
ATA6285/ATA6286
VCO
Power
VCO
amp.
PLL
Antenna
Antenna
Demodulator)
RF Receiver
(LNA, Mixer,
RSSI Amp.,
VCO, PLL,
IF Filter,
UHF ASK/FSK Receiver
Control
Digital
Logic
XTO
controller
Interface
Supply
Power
Micro-
4 to 8
4958BS–AUTO–01/09
controller
Micro-