ATA5278-PKQI datasheet, PDF - EEWORLD Datasheet

Datasheet> All Categories > Other integrated circuit (IC)> Consumption circuit> ATA5278-PKQI

ATA5278-PKQI: CategoryOther integrated circuit (IC) Consumption circuit; File Size412KB，35 Pages; ManufacturerAtmel (Microchip); Environmental Compliance

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Parameter Name	Attribute value
Is it Rohs certified?	conform to
Maker	Atmel (Microchip)
Parts packaging code	QFN
package instruction	HVQCCN,
Contacts	28
Reach Compliance Code	unknown
ECCN code	EAR99
Commercial integrated circuit types	CONSUMER CIRCUIT
JESD-30 code	S-XQCC-N28
JESD-609 code	e3
length	7 mm
Humidity sensitivity level	2
Number of functions	1
Number of terminals	28
Maximum operating temperature	105 °C
Minimum operating temperature	-40 °C
Package body material	UNSPECIFIED
encapsulated code	HVQCCN
Package shape	SQUARE
Package form	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
Certification status	Not Qualified
Maximum seat height	1 mm
Maximum supply voltage (Vsup)	16.5 V
Minimum supply voltage (Vsup)	7.5 V
surface mount	YES
technology	BCDMOS
Temperature level	INDUSTRIAL
Terminal surface	Matte Tin (Sn) - annealed
Terminal form	NO LEAD
Terminal pitch	0.8 mm
Terminal location	QUAD
width	7 mm

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Features

•

SPI for Microcontroller Connection with Up to 1 Mbit/s

Internal Data Buffer for Timing-independent Data Transmission

Programmable Driver Current Regulation

One-chip Antenna Driver Stage for 1A Peak Current

LF Baud Rates Between 1 kbaud and 4 kbaud

Quick Start Control (QSC) for Fast Oscillation Build-up and Decay Timing

Integrated Oscillator for Ceramic Resonators

Power Supply Range from 7.5V to 16V Direct Battery Input

(Up to 28V With Limited Function Range)

Amplitude Shift Keying (ASK) Modulation

Phase Shift Keying (PSK) Modulation

Carrier Frequency Range from 100 kHz to 150 kHz

Operational Temperature –40°C to +105°C

EMI and ESD According to Automotive Requirements

Highly Integrated — Less External Components Required

Stand-alone

Antenna Driver

ATA5278

Applications

•

Hands-free Car Access (Passive Entry/Go)

Tire Pressure Measurement

Home Access Control

Care Watch Systems

Benefits

•

Diagnosis Function and Overtemperature Protection

•

Load Dump Protection Up to 45V for 12V Boards

•

Power-down Mode for Minimum Power Consumption

1. Description

The ATA5278 device is an integrated BCDMOS antenna driver IC dedicated as a

transmitter for Passive Entry/Go (PEG) car applications and for other hands-free

access control applications.

It includes the full functionality of generating a magnetic LF field in conjunction with an

antenna coil to transmit data to a receiver in a key fob, card or transponder. A micro-

controller can access the chip via a bi-directional serial interface.

4832D–RKE–12/07

3. Functional Description

3.1

General Description

The IC contains a half-bridge coil driver stage with a special driver voltage regulator and control

logic with diagnosis circuitry. It is controllable by a serial programming interface (SPI).

In combination with an LC antenna circuitry, the IC generates an electromagnetic LF field. The

carrier frequency for the antenna is generated by the oscillator and a pre-scaler logic.

The LF field can be modulated to transmit data to a suitable receiver. Two modulation modes

are available: Amplitude Shift Keying (ASK) and 180° Phase Shift Keying (PSK). The transmis-

sion data has to be stored in the internal data buffer.

The IC consists of two main functional blocks:

• The SPI with the data buffer, the control registers and the oscillator

• The driver stage with its control logic and the power supply stage

A boost converter is used to supply the driver half-bridge with a high voltage and a regulated

current even if the battery voltage is low. The antenna current is programmable in 16 steps to

support a transmission with various field strengths.

The driver circuitry is protected against short-circuits and overload.

3.2

Operational States

After power-on-reset, the ATA5278 is in power-down mode. To achieve minimum power con-

sumption, only the internal 5-V supply and the control registers are active. The IC can only be

activated by the external control unit via the serial interface (i.e., the chip select line is enabled).

Once activated, the chip keeps the oscillator active and waits for commands on the serial bus.

This state can be described as standby mode. Only upon an external reset or on command fol-

lowed by disabling the chip select line, the power-down mode is re-invoked.

The modulator stage, together with the antenna driver and the power supply, is activated as

soon as LF data is written into the buffer and remains in this state until all data has been sent, a

stop command has been given via the SPI or a fault occurred. The data modulation is running

independently of the SPI activity and can be monitored with the MODACTIVE pin.

3.3

Power-down Mode

The ATA5278 should be kept in power-down mode as long as the LF channel is not used,

because not only is the current consumption minimal, but the internal logic is also reset. The

antenna driver stage is in high impedance mode. To power-up the chip, the chip-select line

(S_CS) has to be activated for an appropriate time. The SPI then starts the internal oscillator

which is necessary for proper operation. Only after a certain oscillation build-up time, is full func-

tionality available. The microcontroller can check out the state of the IC with two state bits

automatically returned by any SPI command.

ATA5278

4832D–RKE–12/07

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