ATA5279-PLQW Atmel, ATA5279-PLQW Datasheet

RF Wireless Misc High-end multiple antenna driver IC

ATA5279-PLQW

Manufacturer Part Number
ATA5279-PLQW
Description
RF Wireless Misc High-end multiple antenna driver IC
Manufacturer
Atmel
Datasheet

Specifications of ATA5279-PLQW

Package / Case
VQFN-48
Mounting Style
SMD/SMT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
1. Description
The Atmel
tems. It can drive up to six low-frequency-antennas (i.e., coils) to provide a wake-up
and initialization channel to the key fob.
Figure 1-1.
S_CLK
OSCO
NRES
MACT
BCNT
S_CS
MOSI
MISO
OSCI
Six Connections for Series-resonant LF Coil Antennas
Drives up to 1A Peak Current on the First Three Channels and up to 700mA Peak on the
Second Three, Largely Independent of the Battery Voltage
On-off-keyed Data Modulation with up to 5.7kbit/s (Manchester Coded)
Sinusoidal-like Output Signal for Superior EMC Behavior
20 Selectable Steps for Current Regulation for Field Strength Measurement (RSSI)
Output Driver Stages are Protected Against Electrical and Thermal Overload
Very Low Power-down Current Consumption
SPI Interface for Easy Microcontroller Bus Connection
LF Data Buffer to Minimize Microcontroller’s CPU Load During a Data Transmission
Small Outline Package: QFN48, 7mm
IRQ
VIF
®
Oscillator
ATA5279 is an LF coil driver IC intended for passive entry/-go (PEG) sys-
AGND
SPI
Protocol Handling
Block Diagram
Communication
Control Logic
POR, BG, UV/OV
Internal Supply
VS
LF Data Buffer
Driver Stage
Reference
Control
RGND
VCC
7mm
VL
Sine Wave
Generator
Controller
Integrator
and Hold
Sample
Boost
DC
DC
PGND
CINT
VSHS
Return Line
Zero Cross
Detector
HP 1-3
LP 1-3
Driver
VDS
A1P
A2P
A3P
A4P
A5P
A6P
A1N
A2N
A3N
A4N
A5N
A6N
VSHF
Atmel ATA5279
Atmel ATA5279C
Antenna Driver
for Multiple
Antennas
9125L–RKE–03/11

Related parts for ATA5279-PLQW

ATA5279-PLQW Summary of contents

Page 1

... LF Data Buffer to Minimize Microcontroller’s CPU Load During a Data Transmission • Small Outline Package: QFN48, 7mm 1. Description ® The Atmel ATA5279 coil driver IC intended for passive entry/-go (PEG) sys- tems. It can drive up to six low-frequency-antennas (i.e., coils) to provide a wake-up and initialization channel to the key fob. Figure 1-1. Block Diagram VS ...

Page 2

... Coil 3 negative connection line pin 2 16 A5N1 Coil 5 negative connection line pin 1 17 A5N2 Coil 5 negative connection line pin 2 18 VSHF2 Shunt resistor driving pin 2 19 A2N1 Coil 2 negative connection line pin 1 20 A2N2 Coil 2 negative connection line pin 2 Atmel ATA5279 RGND 2 CINT 3 ...

Page 3

... PGND2 Boost converter low-side switch output 2 46 VL2 Boost converter low-side switch input 2 47 PGND3 Boost converter low-side switch output 3 48 VL3 Boost converter low-side switch input 3 9125L–RKE–03/11 Atmel ATA5279 Pin Group DS LRL LRL HRL HRL HDL DS - LDL HDL ...

Page 4

... DC-DC converter is also operating connection failure (short circuit on any of the coil connection lines) is detected, the ATA5279 enters the shutdown mode to protect itself from damage. In this mode, the interface operates in idle mode but with all power stages shutdown and no LF transmission command processing ...

Page 5

... VDS potential. The same applies to the return line inputs AxN. These mea- sures ensure minimum parasitic currents in the disabled coils while the selected coil is operating. 9125L–RKE–03/11 Principle Driver Stage Setup VDS mirr VSin_pre P mirr1 P mirr2 Internal nodes GND Atmel ATA5279 I HSDiag Diag Enable AxP Ax_State N pwr Diag Enable I LS LSDiag 5 ...

Page 6

... The output signal itself has a DC offset close to the half of the supply voltage, and the maxi- mum possible amplitude has about 3V distance to each of the supplies. this. Figure 3-2. Atmel ATA5279 6 Shutdown Mode Idle Mode Fault has detected ...

Page 7

... VL There is no dedicated temperature monitoring for the boost converter low-side switch. For fur- ther details, please refer to Section 4.1 “Application Hints” on page . CINT,max Atmel ATA5279 Shunt is the on-resistance of the DSon,HRS/LRS Section 8. “Functional Parameters” on page 27). are measured to shut down the VDS 28 ...

Page 8

... SPI commands, so that the microcontroller can be programmed to detect most of the possible faults, for example, shorts between different coil connection lines and multiple shorts in one pair of lines. Atmel ATA5279 8 later in this document result, transmission on ® ATA5279 has implemented test structures that can be activated and read Section 3.9.2 “Gen- 9125L–RKE–03/11 ...

Page 9

... AxP c0 bit S_LxP c0 = '0' AGND Section 3.9.2 “General Command Description” on page 21 Atmel ATA5279 VDS S_HxN c1 = '1' AxN S_LxN c1 = '0' AGND Latch Driver x select c0, 1 bits ® ATA5279. As soon and c are taken from the coil current selection this document). c1 bit 9 ...

Page 10

... The final diagnosis can be identified by changing both channels to the high-side switches (S_H1P and S_H2P). In this case, the two status lines both return 1s – which eliminates the possibility of two short-circuits to ground. Table 3-2 Atmel ATA5279 10 Example 1, Using the Diagnosis Mode S_H1P A1P ...

Page 11

... I 01101000 – 68h Reads back active driver info: O 00000010 – 02h Channel 2 active and A2P returns ant = ----------------------------------------------------- - 300 µA 21. Atmel ATA5279 S_L2P and S_H2N are then open S_H2P and S_H2N are then open Figure 3-4 on page 10 Section 3.9.2 “General Command 11 ...

Page 12

... The precise fault cannot be found though. The diagnosis result would be the same both for the above shown cir- cuit and for the A4N line being directly shorted to VS (without the failure in the coil module, here R Atmel ATA5279 12 Example 2, Using the Diagnosis Mode R ...

Page 13

... To exit the diagnosis mode correctly, two SPI commands have to be sent: the first is the Select Driver command with the DM bit set to 0 and the second is a Reset Fault Status command. See also SPI Command Description. and Figure 3-8 illustrate this. Atmel ATA5279 S_H4P and S_L4N are open then S_H4P and S_H4N are open then 13 ...

Page 14

... S_CLK MISO Z X MOSI Figure 3-7. SPI Operation in POL = 0 and PHA = 0 Mode Sample S_CS S_CLK MISO Z MOSI X LSB Figure 3-8. SPI Operation in POL = 1 and PHA = 0 Mode Sample S_CS S_CLK MISO Z MOSI X LSB Atmel ATA5279 14 Sample LSB Setup Setup MSB MSB Z MSB ...

Page 15

... The diagram above is using POL = 0 and PHA = setup for the SPI. The values are also valid for the other three configurations. The limits for the timing values shown above can be found in Section 8. “Functional Parameters” on page Atmel ATA5279 MSB 21). Note that after power- reset, the IC is ...

Page 16

... The buffer can store up to 128bits, organized in 16 words, each eight bit in size. Hence, each data word from the SPI that contains a control command for the driver stages (i.e., select a certain driver, select a certain current, transmit LF-data bits and transmit a constant wave) is stored in a buffer word. Atmel ATA5279 16 Operation/ Transmission Mode ...

Page 17

... Send LF-data and the Send Carrier command. Refer also to the tion 3.9.1 “Modulator Stage” on page 18 9125L–RKE–03/ Data Selector General Command 4 7 Processing for further details. Atmel ATA5279 Write Pointer Read Pointer Modulator Stage 8 Sec- 17 ...

Page 18

... Table 3-5. Command Select Driver Select Coil Curr. Send LF Data Send LF Carrier Note: Atmel ATA5279 18 lists the timings for the driver-related commands. Execution Durations of Driver-related Commands Dur. [LF per.] Comment During the first 32 periods, the actual driver is stopped in order to decay any oscillation in the coil. Then the switching itself is ...

Page 19

... Figure 3-12. Example for OOK-data Modulation with Atmel ATA5279 Coils with high Q values need more periods to reach the desired field strength and hence appropriate detection level thresholds in the receiver ...

Page 20

... Transmitter Coil Current The MACT signal can be used to start a timer whereas BCNT can be used as input signal to a counter. Note that for carrier transmissions, only the MACT signal is active. There are not any pulses on the BCNT line. Atmel ATA5279 20 First Command Modulator Data ...

Page 21

... The FIFO buffer fill state exceeds the upper limit of 16 bytes The FIFO buffer fill state drops to 25% or below, i.e., only 4 words are left Chip overtemperature indicator LF modulator speed mode indicator LF driver stage operability indicator Atmel ATA5279 Output Word (MISO Data ...

Page 22

... Otherwise, the internal logic might get corrupted and must then be reset with a negative pulse on the NRES line. Note that this command is also required to bring the Atmel ATA5279 back into operation mode once the diagnosis mode was active and was then cleared by a Select Driver command. • ...

Page 23

... Send LF Data: This command must be used to start an LF data telegram on the selected coil. The bits N ATA5279. This amount has to be coded as follows: N Hence, a maximum of 16 nibbles or eight words and a minimum of one nibble can be written into the buffer using one command. ...

Page 24

... Send LF Carrier: This command should be used when a carrier shall be transmitted on the LF channel via the selected coil. The current will be regulated by ATA5279 to the value selected with the last Select Coil Current command (resp. the default value of 50mA). See also “Coil Current Sensing (Zero Cross, Sample and Hold, Integrator)” on page 7 details ...

Page 25

... This bit indicates a missing return line signal during modulation. That means that the : This bit indicates an excessive positive voltage on the VSHS pin. In normal : This bit indicates an excessive current through the high-side transistor that drives the : This bit indicates an excessive current through the low-side transistor that drives the Atmel ATA5279 ...

Page 26

... Furthermore, the driver supply voltage present on the VDSx pins is also monitored. If the level falls below V the Status Register) and driver-related commands cannot be processed. Once the voltage level is valid again, the Op bit is set again, and operability is restored. Atmel ATA5279 26 , the operability flag of the chip is cleared (bit Op in VDS,min ...

Page 27

... A negative current on pin MISO that causes the voltage to drop below –0.6V with respect to ground might lead to a chip reset, comparable to a logic low on the NRES pin. 2. For applications with > 6 antennas please refer to the application note “Atmel ATA5279 Antenna Driver Extension”. ...

Page 28

... DC-DC converter. Background information, design hints and an example are given in the application note “LF Antenna Driver ATA5279 – Thermal Considerations and PCB Design Hints” strongly recommended to measure the power dissipation in the target application during the design phase to verify the system's thermal budget ...

Page 29

... If the VDS output voltage regulation fails due to too high input currents or too high output volt- age, the power dissipation increases the DC resistance, regarding the freewheeling diode important. The devices' names refer to the application schematic (see 3 27). Atmel ATA5279 Z(Ant) = 12.5Ω I(Ant) = 1000 mAp 11.0 12.0 13.0 14.0 15 ...

Page 30

... Under worst case conditions, e.g., low supply voltage and high antenna impedance, the maxi- mum antenna current might not be reached. A “static” operation of ATA5279 is not allowed for typical transmit currents of several hundreds of mAs. Typical applications are operated with a temporary LF field, resulting in an on/off oper- ation mode of the chip ...

Page 31

... VS V VDS,max V AxP,max V VSHF,max V AxNx,max V DIGSUP,max V GND,max V IO,max V CINT,max V ESD T j.max Symbol R thJC (1) R thJA Symbol T j Atmel ATA5279 Min. Max. –0.3 40 –0.3 46 –0 0.3 VDS – 0.3 VCC V – 0.3 46 VSHF –0.3 +5.5 –0.3 +0.3 –0 0.3 VIF –0 0.3 ...

Page 32

... In this column, pin group names are given. Please refer to more details. 2. Operation of coils with higher impedance than the given value is possible but functional limitations might occur (inability to reach to configured coil current). Coils with lower impedance should not be used as they might be detected as faulty. Atmel ATA5279 32 105°C unless otherwise noted. a ...

Page 33

... HDL V AxPH,dile = ±200mA 30°C = 20V = –100µA HDL R AxPH,PU 30°C = 16.5V I PU,Diag = 0V = 16.5V I PD,Diag = 16.5V Section 2. “Pin Configuration” on page 2 Atmel ATA5279 Min. Typ. Max. Unit 1.8 4.4 0.9 2.2 1.8 4.4 220 360 0.45 0.55 VIF VIF 3 6 –1.7 –0.88 1 ...

Page 34

... In this column, pin group names are given. Please refer to more details. 2. Operation of coils with higher impedance than the given value is possible but functional limitations might occur (inability to reach to configured coil current). Coils with lower impedance should not be used as they might be detected as faulty. Atmel ATA5279 34 105°C unless otherwise noted. a ...

Page 35

... V REF, REF, REF, REF, REF, REF,S10 - V REF,S11 - V REF,S12 - V REF,S13 - V REF,S14 Section 2. “Pin Configuration” on page 2 Atmel ATA5279 Min. Typ. Max. Unit 100 µs –10 +10 mV 150 290 ns 830 970 mV 440 560 mV –2.5 +2.5 mV –20 –8 µ µA 3.15 3.45 V 49.5 54 ...

Page 36

... In this column, pin group names are given. Please refer to more details. 2. Operation of coils with higher impedance than the given value is possible but functional limitations might occur (inability to reach to configured coil current). Coils with lower impedance should not be used as they might be detected as faulty. Atmel ATA5279 36 105°C unless otherwise noted. a ...

Page 37

... Coils with lower impedance should not be used as they might be detected as faulty. 9125L–RKE–03/11 105°C unless otherwise noted. a Pin Symbol = 3. 3. NRES,min = 2.5V I L,max Section 2. “Pin Configuration” on page 2 Atmel ATA5279 Min. Typ. Max. Unit 0.48 0.64 V VIF 0.32 0.48 V VIF 100 ns 500 nA in this document for Type* A ...

Page 38

... ATA5279P-PLQW ATA5279P-PLPW ATA5279C-PLQW ATA5279C-PLPW 10. Package Information Package: VQFN_7 x 7_48L Exposed pad 4.5 x 4.5 Dimensions in mm Not indicated tolerances ±0.05 1 Pin 1 identification 12 Drawing-No.: 6.543-5137.01-4 Issue: 1; 19.10.06 Atmel ATA5279 38 Package VQFN48, 7mm 7mm VQFN48, 7mm 7mm VQFN48, 7mm 7mm VQFN48, 7mm 7mm Top 48 7 ...

Page 39

... Table 3-1 “States of Driver Outputs within Operation Modes” on page 6 added Table 3-4 “States of Control I/Os” on page 16 added Note 2 “For applications with 6 antennas ... “ on page 27 added Note “Application Note - LF Antenna Driver ATA5279P ... “ on page 30 added Section 5 “Absolute Maximum Ratings” part “Count of peaks over lifetime ... “ on page 31 changed Section 7 “ ...

Page 40

... Disclaimer: The information in this document is provided in connection with Atmel products. No license, express or implied, by estoppel or otherwise, to any intellec- tual property right is granted by this document or in connection with the sale of Atmel products. EXCEPT AS SET FORTH IN THE ATMEL TERMS AND CONDITIONS OF SALES LOCATED ON THE ATMEL WEBSITE, ATMEL ASSUMES NO LIABILITY WHATSOEVER AND DISCLAIMS ANY EXPRESS, IMPLIED OR STATUTORY WARRANTY RELATING TO ITS PRODUCTS INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICU- LAR PURPOSE, OR NON-INFRINGEMENT ...

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