19/35

L4969

2

CONTROL AND STATUS REGISTERS

The functionality of the device can be observed and controlled through a set of registers which are read and

writable by the serial interface.

2.1

ADR 0: VRCR Voltage Regulator Control Register

Figure 11.

Note, that when using the Undervoltage-detection, EUV2 and EUV3 have to be activated AFTER V2 or V3 have

been turned on and settled (t > 1ms). Otherwise unwanted undervoltage can be detectected during turn on of

the corresponding voltage regulator.

TRC

Disable all Regulators (Go to Sleep)

Enable Regulator #3 .

V3 will be activated by either setting ENV3 or

upon enabling of the CAN Lineinterface

Enable Regulator #2.

Enable Regulator #2 tracking option

RES

to have V2 following V1 with constant offset

RTC0

Set reset threshold value to 4.0V

Default value is ‘0’ (4.5V)

EUV2

EUV3

ENV3

ENV2

DISAR

Has to be

Default value is ‘0’ (disabled)

Default value is ‘0’ (disabled)

This bit will be automatically reset upon

Overtemperature from CANIF or Regulator #3

Default value is ‘0’ (disabled)

This bit will be automatically reset upon

Overtemperature at Regulator #2.

D7

D0

DISAR

V1

V3

(DISAR & ENV3 |

ACT) & TSDV3

TRC

V2

DISAR & ENV2

Note, that at least one Wakeup Source

to enable access.

This bit will be automatically set upon

the system failures Overtemperature V1

Enable undervoltage

detection on

Regulator #2 and #3

REF

(see note below)

Note, that due to the large initial charging current of the output capacitors,

the activation of V2 AND V3 within the same command is not recommended

written as ‘0’.

without a pending wakeup is required

or watchdog startup failure.

DISAR will be cleared upon a valid

wakeup signal which is either defined

in GIEN or is forced to WAKE or CAN

after a system failure

V3 will be activated upon VRCR.ENV3 or

CCTR.ACT without pending thermal shutdown

Note, that no reset will be generated

from low V1 during Sleep mode transition

The Reset line has to be forced low

externally, or through a window failure

also leaving ENV2 or ENV3 set when setting DISAR can therefor not be

recommended (after wakeup V1 AND V2 or V3 would be turned on)