9860 VBatt Enable COIL1 Driver Oscillator

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9860 VBatt Enable COIL1 Driver Oscillator

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Reader U2270B
9860
VBatt
Enable
COIL1
Driver
Oscillator
Power supply
Standby
COIL2
U2270B
Output Input read channel CODE
GAIN
Ouput Enable
U2270B serves interface between transponder microcontroller that compares received data. This interface operates bidirectional. direction energy transfer from reader transponder. reader creates magnetic field reader coil. This coil operated special driver circuit. driver consists output stages that operated common differential mode Using this feature, user flexible design antenna. driver controlled on-chip oscillator. operating frequency programmed external resistor. This enables user externally adjust frequency relevant circumstances. This feature important compensate frequency tolerances antenna transponder. oscillator disabled through enable read-write operation.
other direction data transfer from transponder microcontroller. transponder modulates magnetic field with internal data. This leads tiny voltage modulation reader coil. rectifier, this signal into input reader read channel amplifies conditions signal convert appropriate digital output data. gain amplifier programmed through GAIN adopt relevant reading distance. opencollector output serves interface connected controller. With logic signal data output disabled. reader also incorporates internal power supply. This enables user operate system from 12-V supply also from existing supply rail. Standby, U2270B power-down mode where supply current very low.
10.00
Extended Reading Range with Large Reader Antennas with U2270B
Theoretical coupling factor reading distance, optimized reader antenna diameter
(mm) (mm)
k(%)
x/2)
(mm)
Figure Coupling factor coil radius distance
Example Reader antenna: Measured coupling factor, with (test transponder coil)
0.45 0.40 0.35 0.30 k(%) 0.25 0.20 0.15 0.10 0.05 0.00 [center reader coil middle TTC]
Figure Coupling factor reader coil
Calculation Maximal U2270B output current (see chapter "Antenna Design Hints") VEXT DRVpp 14.8 DRVss DRVpp 18.8 VEXT DRVpp 14.8 DRVss DRVpp 18.8
DRVss mAss
10.00
VDRVss
VRss IDRVss
VEXT Vss, mVss reading distance 1450 VEXT Vss, mVss reading distance Application U2270B demo board, 12-V application with diode feedback, differential output mode, rail operation (driver voltage VDVS application suitable mentioned conditions only (transponder frequency tolerance base station). TK5561 multistep frequency self adaption already implemented. TK5530 TK5551, additional multistep frequency self adaption implemented base station. Refering chapter "Electronic Immobilizers Automotive Industry", figure frequency self adaption should realized extended application.
Test conditions Reader antenna: radius 32), 1450
Results Reading distance Atmel Wireless Microcontrollers' TK5530 transponder kHz, rf/32), reader resonance frequency tuned transponder resonance frequency (total frequency tolerance max. 1%). 2.35 VEXT Vss, mVss reading distance
C_15
7808
VEXT VBATT STANDBY COIL2 OUTPUT
STBY
COIL2
100n
COIL1
COIL1 INPUT
DGND GAIN
1N4148 680p 100k 1N4148 1N4148
1N4148 1N4148
470k
VC_15 VDVS
Figure Application schematic
10.00
Distance Measurements Using Application TMEB8704
(Best case results degrees) Transponder Type Reading Distance without Autotuning RF/32 TK5530 TK5551 TK5552 TK5561 RF/64 with Autotuning RF/32 RF/64 Writing Distance
Order address transceiver coil: Part V-31013-30001
Company Wagner Elektrogeraete GmbH Sulzbacher Str. 71577 Grosserlach Germany
TMEB8704 Description
TK5552A-PP TK5551A-PP TK5561A-PP Windows Same READ WRITE distance WRITE distance Extended READ distance
10.00
Programmable Transponder with Interface Active RF/IR Channel
this offering, Atmel Wireless Microcontrollers added U9280M, device with intelligent power management, integrating 4-bit microcontroller incl. EEPROM transponder front end. This fully programmable device combines transponder remote control functions, offering highest flexibility market implementing transponder algorithms IR/RF protocols. U9280M provides extremely power consumption: typ. active mode, power-down mode. Applications U9280M: immobilizer Access control alarm technics Telemetery wireless sensor
System Solution Immobilizer Combination with
"Super-het" U2741B U9280M "Super-het" U2270B M44C892 Alarm U3741BM T5743N Door locks Trunk Decoder control
Lights
DA5209/ DA5276 Ultrasonic alarm
10.00

9860 VBatt Enable COIL1 Driver Oscillator

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