STPM098C datasheet(11/110 Pages) STMICROELECTRONICS

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Functional description

3.1

Internal supply

3.1.1

VCC power supply

The VCC power supply is the main power input of STPM098C. The VCC rail starts the power-up and the power-

down sequences by feeding the subsequent internal purpose circuitries (that is, bandgaps, monitoring units and

internal regulators control loops).

Starting form VCC pin the reference structures are replicated into two independent instances to avoid common-

cause failures (a main one and an auxiliary one).

Figure 5. Internal power supply simplified block diagram

Main

Bandgap

Reference

Auxiliary

Bandgap

Reference

VCC

Monitor

VBG

AUXILIARY

VBG

MAIN

BG AUX OK

VCC_OV

Auxiliary

Current

Reference

Main

Current

Reference

BG MAIN OK

GND

CFILT/VREF1

CFILT/VREF2

GND

VCC

Analog

Circuitry

GND

VREF1

Monitor

POR_DIG

CFILT/VREF1

VREF2

Monitor

VREF2 UV

VREF2 OV

CFILT/VREF2

VCC_UV

POR_ANA

3.1.1.1

VCC monitor

VCC voltage level is monitored by means of dedicated UV and an OV diagnosis. Abnormal behavior on the

internal supply level causes the generation of a POR_ANA (analog power-on reset) event that consequently

sends STPM098C into SAFE_HIZ state. Hysteresis on thresholds and filtering time are implemented.

If VCC ≤ VCC_uv_th occurs for an interval longer than T_vcc_uv_flt, VCC_UV flag is set, POR_ANA is asserted

low and SAFE_HIZ is established. The error flag remains set until the failure condition is removed and a rising

edge on VR1_EN or VR2_EN is detected. The failure condition can be removed also by PMBUS command

CLEAR_FAULTS or by dedicated commands (depending on PMBUS configurations).

If VCC ≥ VCC_ov_th occurs for an interval longer than T_vcc_ov_flt, VCC_OV flag is set, POR_ANA is asserted

low and SAFE_HIZ is established. The error flag remains set until the failure condition is removed and a rising

edge on VR1_EN or VR2_EN is detected. The failure condition can be removed also by PMBUS command

CLEAR_FAULTS or by dedicated commands (depending on PMBUS configurations).

VCC monitor is safety relevant and then a self-check procedure is implemented.

STPM098C

Functional description

DS14440 - Rev 1

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