L99DZ320 datasheet(47/146 Pages) STMICROELECTRONICS

47 / 146 page

Bits FORCED_SLEEP_TSD2_V1SC (SR8) and V1FAIL (SR7) are set.

In the case of a V2 short to GND failure, the V2SC (SR7) and V1FAIL (SR7) bits are set.

Once the output voltage of the corresponding regulator V1 (V2) has exceeded the V1fail (V2fail) threshold, the

short to ground detection is disabled. In case of a short to ground condition, the regulator is switched off due to

thermal shutdown. V1 is switched off at TSD2, V2 is switched off at TSD1.

3.2.5

Voltage regulator behavior

Figure 15. Voltage regulator behavior and diagnosis during supply voltage ramp-up/ramp-down

conditions

Vsreg [ V ]

V1 [ V ]

Nreset

output

VPOR

VRTH

High

Low

V1fail

If t > tv1short

V1 short detected

è VBAT_standby

t > tV1fail

V1FAIL bit is set

t < tUV1

trr

t > tUV1

No Reset generated

t > tUV1

tRD

VSregUV

tV1FS

specific Control Registers are set to default values

High Z Grounded

VSregUV:

Vsreg under-voltage

VPOR_R/F:

Vsreg power-on reset voltage

(rising/falling)

VRTx:

V1 reset threshold voltage

V1FAIL:

V1 fail threshold voltage

tUV1:

V1 under-voltage filter time

tV1fail:

V1 fail filter time

trr:

reset pulse reaction time

tRD

reset pulse duration

tV1short:

V1 short filter time

tV1FS:

V1 fail safe filter time

tOVUV_filt:

Vsreg over-/undervoltage filter time

Control

Registers

set to default

at VPOR_F

If t1 >tV1FS

100us

RSTB bit is set and registers

(filter time tOVUV_filt )

VSREGUV bit is set

are set to default at VPOR_R

L99DZ320

Functional description

DS14235 - Rev 5

page 47/146

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