STPM098C datasheet(45/110 Pages) STMICROELECTRONICS

45 / 110 page

Symbol

Parameter

Test condition

Min

Typ

Max Unit

Notes

ADC input Resolution

OTM_readout_red OTM resolution

bits Design information

OTM_readout_lsb OTM LSB

1.378

°C

Design information

ADC input accuracy

OTM_acc

OTM ADC conversion

accuracy

-10

°C

Temperature Read out

accuracy

ADC input dynamic characteristics

OTM_sr

OTM ADC sample rate

CLK_SSM_EN = 0

kHz Application information

OTM_latency

OTM ADC conversion latency CLK_SSM_EN = 0

0.205

ms Application information

3.10

Auxiliary voltage monitor (AVM)

STPM098C implements a general-purpose voltage monitor through pin AUX_SENSEs to allow a dedicated UV

and OV diagnosis for external voltage references. Hysteresis on thresholds and filtering time are implemented.

The digitized voltage information is compared with a selectable threshold based on the following scheme:

If AUX_SENSE ≤ AUX_SENSE_uv_th occurs for an interval longer than T_avm_detect_dly, fault is asserted and

the AUX_SENSE_UV flag is set. Fault pins are asserted LOW according to FHC configuration and FOR table.

If AUX_SENSE ≥ AUX_SENSE_ov_th occurs for an interval longer than T_avm_detect_dly, fault is asserted and

the AUX_SENSE_OV flag is set. Fault pins are asserted LOW according to FHC configuration and FOR table.

The reference thresholds for the AVM monitor unit AUX_SENSE_uv_th and AUX_SENSE_ov_th can be

separately configured through a dedicated PMBus™ register as follows:

AUXSENSEUVTH+AVMtℎℎyst=AVMtℎlsb×AUXSENSEUVTH2:0+OFS

(3)

AUXSENSEOVTH+AVMtℎℎyst=AVMtℎlsb×AUXSENSEOVTH2:0+OFS

Where:

AVM_adc_lsb is the minimum voltage step [131 mV = 7 * AVM_adc_lsb].

AUX_SENSE_uv_th [2:0] are the dedicated PMBus™ configuration bits [0.486 V ~ 1.402 V].

AUX_SENSE_ov_th [2:0] are the dedicated PMBus™ configuration bits [0.617 V ~ 1.533 V].

OFS is the starting value [486 mV = 26 * AVM_adc_lsb].

The default value is AUX_SENSE_uv_th =0x0 and AUX_SENSE_ov_th = 0x0.

In case AUX_SENSE_uv_th = 0x0 the AVM UV function is disabled and no UV detection is performed.

In case AUX_SENSE_ov_th = 0x0 the AVM OV function is disabled and no OV detection is performed.

The absolute value of the maximum input voltage slew rate detectable by IIN monitor is given by AVM_adc_lsb/

AVM_adc_latency.

STPM098C

Functional description

DS14440 - Rev 1

page 45/110

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