L99LD21 datasheet(41/73 Pages) STMICROELECTRONICS

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DS11130 Rev 5

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L99LD21

SPI functional description

SR#2: Status Register 2

Address:

0x06h

Type:

R, R/C

9876

543210

Unused

R/C

Table 23. SR#2: Status Register 2

Bit

Default

Name

Description

Access

OVT2

Overtemperature for Buck2 (set when Tj ≥ TTSD for more than

tOVT );

if this bit is set Buck2 is latched OFF; reset is performed by a

R&C command, which will be successful only if

Tj < TTSD - TTSD_HYS. Then Buck2 is allowed to turn on again.

R/C

TW22

Thermal warning 2 for Buck2.

This bit is set if Tj ≥ TW2.

This is a read only and real time bit.

When Buck2 temperature decreases under a second threshold

(Tj < TW2 - TW2_HYS), this bit is cleared.

TW21

Thermal warning 1 for Buck2.

This bit is set if Tj ≥ TW1.

This is a read only and real time bit.

When Buck2 temperature decreases under a second threshold

(TW1 - TW1_HYS), this bit is cleared.

TON_MAX_OP1

Operation at maximum on-time for Buck1.

This bit is set when Buck1 runs at an on-time equal to

tON_MAX_BUCK for two consecutive cycles.

Every time this event occurs, Buck1 is temporarily switched off

for a tTON_MAX_OFF time, then is enabled to switch on again.

Instead, TON_MAX_OP1 bit will be latched until a R&C.

In LHM, an auto restart procedure cyclically clears this bit with

a period equal to tAUTORESTART.

R/C

TON_MAX_OP2

Operation at maximum on-time for Buck2.

This bit is set when Buck2 runs at an on-time equal to

tON_MAX_BUCK for two consecutive cycles.

Every time this event occurs, Buck2 is temporarily switched off

for a tTON_MAX_OFF time, then is enabled to switch on again.

Instead, TON_MAX_OP2 bit will be latched until a R&C.

R/C

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