Rainbow-electronics ATA6630 Uživatelský manuál stáhnout pdf (Strana 9)

9117C–AUTO–10/09

ATA6628/ATA6630 [Preliminary]

4.1 Normal Mode

This is the normal transmitting and receiving mode. The voltage regulator is active and can

source up to 50 mA. The undervoltage detection is activated. The watchdog needs a trigger sig-

nal from NTRIG to avoid resets at NRES. If NRES is switched to low, the IC changes its state to

Fail-safe Mode.

4.2 Silent Mode

A falling edge at EN when TXD is high switches the IC into Silent Mode. The TXD Signal has to

be logic high during the Mode Select window (see Figure 4-2 on page 9). The transmission path

is disabled in Silent Mode. The INH output is switched off and the voltage divider is enabled. The

overall supply current from V

Batt

is a combination of the I

VSsi

= 40 µA plus the VCC regulator out-

put current I

VCC

The 3.3V/5V regulator with 2% tolerance can source up to 50 mA. The internal slave termination

between the LIN pin and the VS pin is disabled in Silent Mode to minimize the current consump-

tion in the event that the LIN pin is short-circuited to GND. Only a weak pull-up current (typically

10 µA) between the LIN pin and the VS pin is present. Silent Mode can be activated indepen-

dently from the actual level on the LIN, WAKE, or KL_15 pins. If an undervoltage condition

occurs, NRES is switched to low, and the IC changes its state to Fail-safe Mode.

A voltage less than the LIN Pre_Wake detection VLINL at the LIN pin activates the internal LIN

receiver and starts the wake-up detection timer.

Figure 4-2. Switch to Silent Mode

Delay time silent mode

_silent = maximum 20 µs

Mode select window

LIN switches directly to recessive mode

= 3.2 µs

LIN

VCC

NRES

TXD

Normal Mode

Silent Mode

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Rainbow-electronics ATA6630 Uživatelský manuál Strana 9