AS8530A-ASOT datasheet(16/32 Pages) AMSCO

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AS8530

Datasheet - Detailed Descr i p ti on

7.8.4 Temporary Shutdown Mode

In this mode, the VCC is pulled down and the LDO is powered down. This mode is introduced to interface with other components which do not

have a pin for the reset functionality. This provides an alternative way to reset those components interfacing with AS8530. This mode is default

disabled but can be enabled by an OTP option. In this mode, all internal modules supplied by the LDO are disabled. Only the oscillator, control

registers are enabled. The VCC output can be temporarily switched off and pulled to VSS. EN signal, RX, TX is pulled low and LIN Transceiver

along with the LIN wake-up circuit is powered down. No remote wake-up functionality is possible. LIN bus enters into recessive state. The

system goes out of this mode to normal mode after the time-out of an internal counter delay (Tshd). Normal mode to temporary shutdown

transition will be controller by register bit in configuration register.

7.8.5 Thermal Shutdown State

If the junction temperature TJ is higher than Tsd, the AS8530 will be switched into the thermal shutdown mode. The transceiver is completely

disabled. No wake-up functionality is available. Window watchdog, TX timeout watchdog, and LDO are completely turned off. Only the over-

temperature monitor would be working. As soon as the temperature returns back to Tret, the system enters normal mode. For more information

on transition, see Table 3.

Note:

L = low state, H = high state, OT = Over-temperature Reset, Uvcc = Undervoltage VCC, Uvbat = Undervoltage VBAT, rwake =remote

wake, X = do not care.

Table 3. Transition Table

Transition

Interface

Reg.

0x05

Flags

Comments

From mode

To mode

LIN

rwake Uvbat

Uvcc

Normal

Mode

Stand-By

X-RS

X-H

H-L

inactive

TX is high for

TSTNDY_triggerr

Sleep

1. Chosen by factory programming option

X-RS

X-H

H-L

inactive

set

TX is high for

TSTNDY_triggerr

Temporary

Shutdown

X-RS

X-H

inactive

set

The Control Bit is set

through the 2-Wire SP

interface

Over-

Temperature

X-RS

X-H

set

Stand-By

Mode

Normal (LW)

H-X

L-H

inactive

Normal (RW)

H-X

set

inactive

Remote Wake up

Event occurred on LIN

Temporary

Shutdown

inactive

set

The Control Bit is set

through the 2-Wire SP

interface

Over-

Temperature

set

Temporary

Shutdown

Mode

Normal

RS-X

H-X

inactive

clear

Internal 128ms timer

expired

Sleep Mode

Normal

RS-X

H-X

set

inactive

clear

Remote Wake up

Event occurred on LIN

Over-

Temperature

2. Effect of Transition

set

hold

Temperature monitor

output asserted

(covered by scan)

All States

Power Off

XXXX

L-H

3. Cause for Transition

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