STPM098C datasheet(20/110 Pages) STMICROELECTRONICS

20 / 110 page

Note:

1. OFF STATE

Internal supply and reference voltage/currents levels are degraded or shutdown.

The main logic is under reset.

All functions are disabled:

–

Input/output telemetry and monitoring units are disabled;

–

Control loop is disabled and PWMn outputs are in HIZ;

–

PMBus™ read/write operations are not available.

The device persists in this state if POR_DIG=’0’ (internal signal).

2. WAIT POR_ANA RELEASE STATE

Internal supply and reference voltage/currents levels are degraded or shutdown.

All functions are disabled:

–

Input/output telemetry and monitoring units are disabled;

–

Control loop is disabled and PWMn outputs are in HIZ;

–

PMBus™ read/write operations are not available.

The device persists in this state if POR_ANA = ’0’ (internal signal).

3. NVM DOWNLOAD STATE

Internal supply and reference voltage/currents are available possibly exceeding spec parametrical ranges.

Main functions are disabled:

–

Input/output telemetry and monitoring units are disabled;

–

Control loop is disabled and PWMn outputs are in HIZ;

–

PMBus™ read/write operations are not available.

In this mode a CRC check on NVM data is first performed:

–

If no CRC error is detected the NVM content is deployed into the main logic register and the next state

is BIST STATE;

–

If a CRC error is detected the related main logic registers are reset to default values (all ‘0’) and the

NVM_CRC_FAIL flag is set to ‘1’ and the next state is LOCKUP STATE;

–

The device persists in this state until the download procedure and CRC check process ends.

4. BIST STATE

Internal supply and reference voltage/currents are available and within spec ranges.

All functions are disabled:

–

Input/output telemetry and monitoring units are disabled;

–

Control loop is disabled and PWMn outputs are in HIZ;

–

PMBus™ read/write operations are not available.

In this mode the following mechanisms are enabled:

–

ABIST and LBIST:

◦

If it fails the next state is SAFE STATE;

◦

If it does not fail the next state is SAFE STATE;

–

MBIST:

◦

If it fails the next state is LOCKUP STATE;

◦

If it does not fail the next state is SAFE STATE;

The device persists in this state until all checks end.

5. LOCKUP STATE

All functions are disabled:

–

Input/output telemetry and monitoring units are disabled;

–

Control loop is disabled and PWMn outputs are in HIZ;

–

PMBus™ read/write operations are not available.

System reboot is needed.

6. SAFE STATE MODE

Internal supply and reference voltage/currents are available and within spec ranges.

Main functions:

–

Input/output telemetry and monitoring units is partially enabled;

–

Control loop is disabled and PWMn outputs are in HIZ;

STPM098C

Functional description

DS14440 - Rev 1

page 20/110

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