ATA6622-PGQW datasheet, PDF - EEWORLD Datasheet

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ATA6622-PGQW: DescriptionIC TXRX LIN W/REG WDT 20QFN; Categorysemiconductor Analog mixed-signal IC; File Size1023KB，31 Pages; ManufacturerMicrochip; Websitehttps://www.microchip.com; Environmental Compliance

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ATA6622-PGQW Overview

IC TXRX LIN W/REG WDT 20QFN

ATA6622-PGQW Parametric

Parameter Name	Attribute value
type	transceiver
protocol	LINbus
Number of drivers/receivers	1/1
duplex	-
data rate	-
Voltage - Power	5 V ~ 27 V
Operating temperature	-
Installation type	surface mount
Package/casing	20-VQFN Exposed Pad
Supplier device packaging	20-QFN（5x5）

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Features

•

Master and Slave Operation Possible

Supply Voltage up to 40V

Operating voltage V

= 5V to 27V

Typically 10µA Supply Current During Sleep Mode

Typically 57µA Supply Current in Silent Mode

Linear Low-drop Voltage Regulator, 85mA Current Capability:

– Normal, Fail-safe, and Silent Mode

– Atmel ATA6622 V

= 3.3V ±2%

– Atmel ATA6624 V

= 5.0V ±2%

– Atmel ATA6626 V

= 5.0V ±2%, TXD Time-out Timer Disabled

– In Sleep Mode V

is Switched Off

VCC- Undervoltage Detection (4ms Reset Time) and Watchdog Reset Logical

Combined at Open Drain Output NRES

Negative Trigger Input for Watchdog

Boosting the Voltage Regulator Possible with an External NPN Transistor

LIN Physical Layer According to LIN 2.0, 2.1 and SAEJ2602-2

Wake-up Capability via LIN-bus, Wake Pin, or Kl_15 Pin

INH Output to Control an External Voltage Regulator or to Switch off the Master Pull Up

Resistor

TXD Time-out Timer; Atmel ATA6626: TXD Time-out Timer Is Disabled

Bus Pin is Overtemperature and Short Circuit Protected versus GND and Battery

Adjustable Watchdog Time via External Resistor

Advanced EMC and ESD Performance

Fulfills the OEM “Hardware Requirements for LIN in automotive Applications Rev.1.0”

Interference and Damage Protection According ISO7637

Package: QFN 5mm

5mm with 20 Pins

•

LIN Bus

Transceiver

with 3.3V (5V)

Regulator and

Watchdog

ATA6622

ATA6624

ATA6626

ATA6622C

ATA6624C

ATA6626C

1. Description

The Atmel

ATA6622 is a fully integrated LIN transceiver, which complies with the LIN

2.0, 2.1 and SAEJ2602-2 specifications. It has a low-drop voltage regulator for

3.3V/85mA output and a window watchdog. The Atmel ATA6624 has the same func-

tionality as the Atmel ATA6622; however, it uses a 5V/85mA regulator. The Atmel

ATA6626 has the same functionality as Atmel ATA6624 without a TXD time-out timer.

The voltage regulator is able to source 85mA, but the output current can be boosted

by using an external NPN transistor. This chip combination makes it possible to

develop inexpensive, simple, yet powerful slave and master nodes for LIN-bus sys-

tems. Atmel ATA6622/ATA6624/ATA6626 are designed to handle the low-speed data

communication in vehicles, e.g., in convenience electronics. Improved slope control at

the LIN-driver ensures secure data communication up to 20kBaud. Sleep Mode and

Silent Mode guarantee very low current consumption. The Atmel ATA6626 is able to

switch the LIN unlimited to dominant level via TXD for low data rates.

4986J–AUTO–03/11

3. Functional Description

3.1

Physical Layer Compatibility

Since the LIN physical layer is independent from higher LIN layers (e.g., the LIN protocol

layer), all nodes with a LIN physical layer according to revision 2.x can be mixed with LIN

physical layer nodes, which, according to older versions (i.e., LIN 1.0, LIN 1.1, LIN 1.2, LIN

1.3), are without any restrictions.

3.2

Supply Pin (VS)

The LIN operating voltage is V

= 5V to 27V. An undervoltage detection is implemented to

disable data transmission if V

falls below VS

< 4V in order to avoid false bus messages.

After switching on VS, the IC starts in Fail-safe Mode, and the voltage regulator is switched on.

The supply current is typically 10µA in Sleep Mode and 57µA in Silent Mode.

3.3

Ground Pin (GND)

The IC does not affect the LIN Bus in the event of GND disconnection. It is able to handle a

ground shift up to 11.5% of VS. The mandatory system ground is pin 5.

3.4

Voltage Regulator Output Pin (VCC)

The internal 3.3V/5V voltage regulator is capable of driving loads up to 85mA. It is able to sup-

ply the microcontroller and other ICs on the PCB and is protected against overloads by means

of current limitation and overtemperature shut-down. Furthermore, the output voltage is moni-

tored and will cause a reset signal at the NRES output pin if it drops below a defined threshold

thun

. To boost up the maximum load current, an external NPN transistor may be used, with its

base connected to the VCC pin and its emitter connected to PVCC.

3.5

Voltage Regulator Sense Pin (PVCC)

The PVCC is the sense input pin of the 3.3V/5V voltage regulator. For normal applications

(i.e., when only using the internal output transistor), this pin is connected to the VCC pin. If an

external boosting transistor is used, the PVCC pin must be connected to the output of this

transistor, i.e., its emitter terminal.

3.6

Bus Pin (LIN)

A low-side driver with internal current limitation and thermal shutdown and an internal pull-up

resistor compliant with the LIN 2.x specification are implemented. The allowed voltage range

is between –27V and +40V. Reverse currents from the LIN bus to VS are suppressed, even in

the event of GND shifts or battery disconnection. LIN receiver thresholds are compatible with

the LIN protocol specification. The fall time from recessive to dominant bus state and the rise

time from dominant to recessive bus state are slope controlled.

Atmel ATA6622/ATA6624/ATA6626

4986J–AUTO–03/11

Atmel ATA6622/ATA6624/ATA6626

3.7

Input/Output Pin (TXD)

In Normal Mode the TXD pin is the microcontroller interface used to control the state of the LIN

output. TXD must be pulled to ground in order to have a low LIN-bus. If TXD is high or uncon-

nected (internal pull-up resistor), the LIN output transistor is turned off, and the bus is in

recessive state. During Fail-safe Mode, this pin is used as output. It is current-limited to <

8mA. and is latched to low if the last wake-up event was from pin WAKE or KL_15.

3.8

TXD Dominant Time-out Function

The TXD input has an internal pull-up resistor. An internal timer prevents the bus line from

being driven permanently in dominant state. If TXD is forced to low for longer than t

DOM

> 6ms,

the LIN-bus driver is switched to recessive state.

To reactivate the LIN bus driver, switch TXD to high (> 10µs).

The time-out function is disabled in the ATA6626. Switching to dominant level on the LIN bus

occurs without any time limitations.

3.9

Output Pin (RXD)

This output pin reports the state of the LIN-bus to the microcontroller. LIN high (recessive

state) is reported by a high level at RXD; LIN low (dominant state) is reported by a low level at

RXD. The output has an internal pull-up resistor with typically 5kΩ to VCC. The AC character-

istics can be defined with an external load capacitor of 20pF.

The output is short-circuit protected. RXD is switched off in Unpowered Mode (i.e., V

= 0V).

3.10

Enable Input Pin (EN)

The Enable Input pin controls the operation mode of the device. If EN is high, the circuit is in

Normal Mode, with transmission paths from TXD to LIN and from LIN to RXD both active. The

VCC voltage regulator operates with 3.3V/5V/85mA output capability.

If EN is switched to low while TXD is still high, the device is forced to Silent Mode. No data

transmission is then possible, and the current consumption is reduced to I

typ. 57µA. The

VCC regulator has its full functionality.

If EN is switched to low while TXD is low, the device is forced to Sleep Mode. No data trans-

mission is possible, and the voltage regulator is switched off.

3.11

Wake Input Pin (WAKE)

The Wake Input pin is a high-voltage input used to wake up the device from Sleep Mode or

Silent Mode. It is usually connected to an external switch in the application to generate a local

wake-up. A pull-up current source, typically 10µA, is implemented.

If a local wake-up is not needed in the application, connect the Wake pin directly to the VS pin.

3.12

Mode Input Pin (MODE)

Connect the MODE pin directly or via an external resistor to GND for normal watchdog opera-

tion. To debug the software of the connected microcontroller, connect MODE pin to 3.3V/5V

and the watchdog is switched off.

4986J–AUTO–03/11

ATA6622-PGQW Related Products

	ATA6622-PGQW	ATA6624-PGQW 19
Description	IC TXRX LIN W/REG WDT 20QFN	IC TXRX LIN W/REG WDT 20QFN
type	transceiver	transceiver
protocol	LINbus	LINbus
Number of drivers/receivers	1/1	1/1
Voltage - Power	5 V ~ 27 V	5 V ~ 27 V
Installation type	surface mount	surface mount
Package/casing	20-VQFN Exposed Pad	20-VQFN Exposed Pad
Supplier device packaging	20-QFN（5x5）	20-QFN-EP（5x5）

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