AS8515 datasheet(15/65 Pages) AMSCO

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AS8515

Datasheet - AS8515 To p Die Overview

Note:

L = Low state, H = High state, OT = Over temperature Reset, UVCC = Under-voltage VCC, UVSENSE = Under-voltage VSENSE,

Rwake = Remote wake, X = don’t care.

7.10.1 Normal Mode

This is the mode after the power-up. In this mode, voltage regulator, LIN transceiver, window Watchdog is all active. The resistive divider can be

enabled through SPI. LIN transceiver is capable of sending the Tx data from microcontroller to the LIN bus at a maximum rate of 20Kbps.

7.10.2 Standby Mode

Standby Mode is a functional low power mode and is entered by pulling EN to ground. The LIN transceiver, resistive divider, window watchdog,

and Tx timeout watchdog circuits are disabled. But, it is possible to selectively enable the voltage and current measurement paths in this mode

using an externally generated measurement enable (MEN) signal on the MEN pin. The timeout Watchdog can be enabled in this mode to make

sure that the Microcontroller is active.

7.10.3 Temporary Shutdown Mode

In this mode, the regulator is powered down and the VCC is pulled down. This provides an alternative way to reset those components powered

by AS8515. The feature has to be enabled by the factory programming option and can be invoked through SPI. The LIN transceiver along with

the LIN wake-up circuits are powered down. No remote wake functionality possible. LIN bus enters into recessive state. The system goes out of

this mode to normal mode after the timeout of an internal timer.

7.10.4 Thermal Shutdown Mode

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

are completely disabled. Only the over-temperature monitor is active. As soon as the temperature returns back to TRET, the system enters

normal mode.

Table 15. Transition Table

Transition

Interface

Reg.

0x05

Flags

Comments

From Mode

To Mode

LIN

Rwake UVSENSE

UVCC

Normal Mode

Stand-By

X-RS X-H1

1. Effect of transition

2. Cause for transition

H-L

inactive inactive

Tx is high for

TSTNDY_trigger

Temporary

Shutdown

X-RS X-H1

inactive

set

The Control Bit is set

through the 4-Wire SPI

interface

Over-

Temperature

X-RS X-H1

set

Temperature monitor

output asserted

(covered by scan)

Standby Mode

Normal (LW)

H-X

L-H

inactive inactive

Normal (RW)

H-X

set

inactive inactive Remote Wake up Event

occurred on LIN

Temporary

Shutdown

inactive

set

The Control bit is set

through the 4-Wire SPI

interface

Over-

Temperature

set

Temperature monitor

output asserted

(covered by scan)

Temporary

Shutdown

Mode

Normal

RS-X H-X1

inactive

clear

Internal 128ms timer

expired

Over-

temperature

Mode

Normal

RS-X H-X1

clear

Temperature monitor

output de-asserted

(covered by scan)

All States

Power Off

L-H

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