STPM098C datasheet(14/110 Pages) STMICROELECTRONICS

14 / 110 page

3.1.2.1

VREF1 voltage monitor

VREF1 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_DIG (digital power-on reset) event that consequently sends

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

If VREF1 ≤ VREF1_uv_th occurs for an interval longer than T_por_htol_flt, POR_DIG is asserted low and internal

reset is triggered. After POR_DIG is deasserted, the INT_RST flag is by default set to 1 and then flag can be

cleared by VR1_EN or VR2_EN rising edge detection. The failure condition can be removed also by PMBus™

command CLEAR_FAULTS or by dedicated commands.

If VREF1 ≥ VREF1_ov_th occurs for an interval longer than T_por_htol_flt, POR_DIG is asserted low and internal

reset is triggered. After POR_DIG is deasserted, the INT_RST flag is by default set to 1 and then flag can be

cleared by VR1_EN or VR2_EN rising edge detection. The failure condition can be removed by also PMBus™

command CLEAR_FAULTS or by dedicated commands.

VREF1 monitor is safety relevant and then a self-check procedure is implemented.

Table 9. VREF1 monitor electrical characteristics

Symbol

Parameter

Test

condition

Min Typ Max Unit

Notes

VREF1_uv_th

VREF1 undervoltage threshold

1.4 1.5

1.6

Comparator output low to high

VREF1_uv_hys VREF1 undervoltage hysteresis

50 105 150

mV -

VREF1_ov_th

VREF1 overvoltage threshold

1.9

2.1

Comparator output low to high

VREF1_ov_hys VREF1 overvoltage hysteresis

100

mV -

T_dpor_ltoh_flt POR DIG Low to high state filter time

3.5 5.5

7.5

μs

Analog filter

T_dpor_htol_flt POR DIG high to Low state filter time

μs

Analog filter

Figure 8. VREF1 power supply operative range

VREF1

VREF1_TH_OV

VREF1_OV_HYST

VREF1 _OV

(Internal signal)

OPERATIVE

POR_DIG

OPERATIVE

VREF1_UV

(Internal signal)

T_dpor_ltoh_flt

INT_RST

(PMBus Flag)

VRn_EN Toggling

T_dpor_htol_flt

VREF1_UV_HYST

VREF1_UV_TH

VRn_EN Toggling

T_dpor_ltoh_flt

T_dpor_htol_flt

T_dpor_ltoh_flt

T_dpor_htol_flt

STPM098C

Functional description

DS14440 - Rev 1

page 14/110

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