ATA663201 datasheet(12/36 Pages) MICROCHIP

12 / 36 page

ATA663201/03/31/54

DS20006075D-page 12

 2018-2021 Microchip Technology Inc.

1.6

Pin Descriptions

The descriptions of the pins are listed in Table 1-4.

1.6.1

OUTPUT PIN (RXD) (SBC ONLY)

In Normal mode this pin reports the state of the LIN bus

to the microcontroller. LIN high (recessive state) is

indicated by a high level at RXD; LIN low (dominant

state) is indicated by a low level at RXD.

The output is a push-pull stage switching between VCC

and GND. The AC characteristics are measured by an

external load capacitor of 20 pF.

In Silent mode, the RXD output switches to high.

1.6.2

ENABLE INPUT PIN (EN)

(SBC ONLY)

The enable input pin controls the operating 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/85 mA 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 current consumption is reduced to

IVSsilent typical 47 µA. The VCC regulator retains its full

functionality.

If EN is switched to low while TXD is low, the device is

forced to Sleep mode. No data transmission is possible

and the voltage regulator is switched off.

The EN pin provides a pull-down resistor to force the

transceiver into Recessive mode if EN is disconnected.

1.6.3

UNDERVOLTAGE RESET OUTPUT

(NRES)

If the VCC voltage falls below the undervoltage

detection threshold VVCC_th_uv_down, NRES switches

to low after tres_f. The NRES stays low even if

VVCC = 0V because NRES is internally driven from the

VS voltage. If the VS voltage ramps down, NRES stays

low until VVS < 1.5V and then becomes highly

impedant.

The implemented undervoltage delay keeps NRES low

for tReset = 4 ms after VVCC reaches its nominal value.

TABLE 1-4:

PIN FUNCTION TABLE

ATA663201 ATA663203 ATA663231

ATA663254

Symbol

Description

3 x 3 VDFN

3x 3 VDFN/

SOIC

—

RXD

Receive Data Output

—

Enables Normal Mode if the Input is High

NRES

VCC Undervoltage Output, Open Drain, Low at

Reset

—

TXD

Transmit Data Input

GND

Ground

LIN

LIN Bus Line Input/Output

—

Supply Voltage

VCC

Output Voltage Regulator 3.3V/5V/85 mA

1,2,4,6

—

Not Connected

Exposed Thermal Pad, Internally Connected to

the GND pin (Note 1)

Note 1:

Only for the VDFN package.

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