STPM098C datasheet(50/110 Pages) STMICROELECTRONICS

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Symbol

Parameter

Test condition

Min Typ Max Unit

Notes

IIN_adc_lsb

IIN ADC LSB

CLK_SSM_EN = 0

53.2

μV

Application

information

ADC input accuracy

IIN_adc_gain_err

IIN ADC gain error

-3

IIN_adc_offset_err IIN ADC input referred offset error

-1

mV -

IIN_adc_tot_err

IIN ADC total error

mV See note

ADC input dynamic characteristics

IIN_adc_in_sr

IIN ADC sample rate

MHz

Application

information

IIN_adc_latency

IIN ADC conversion latency

CLK_SSM_EN = 0

100

μs

Application

information

Note:

IIN_ADC conversion total error can be calculated as follows:

IIN_adc_tot_err = IIN_adc_gain_err * (POWERIN_P - POWERIN_N) + IIN_adc_offset_err

Example:

•

| POWERIN_P-POWERIN_N | = 10 mV

•

Total ADC conversion error = ±1 mV ±(3% * 10 mV) = ±1 mV ±0.3 mV

•

The value read by PMBus™ has a range between 10 mV - (1 mV + 0.3 mV) and 10 mV + (1 mV + 0.3

mV)

3.11.2.1

Input current monitor (IIN monitor)

Input current level is monitored by means of dedicated OC diagnosis based on IIN conversion. A hysteresis on

thresholds and filtering time is implemented.

If POWERIN_P- POWERIN_N ≥ IIN_off_th occurs for an interval longer than T_iin_mon_detect_dly, the fault is

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

If POWERIN_P- POWERIN_N ≤ IIN_on_th occurs for an interval longer than T_iin_mon_detect_dly, the IIN_ OC

fault is released. IIN_OC clearing depends on FHC configuration.

The reference thresholds for the IIN monitor unit IIN_off_th and IIN_on_th can be separately configured through a

dedicated PMBus™ register as follows:

IINOFFTH=IINMONtℎlsb×IINOFFTH9:0

(6)

IINONTH=IINMONtℎlsb×IINONTH9:0

(7)

Where:

IIN_MON_th_lsb is the minimum voltage step [53.2 µV].

IIN_OFF_TH/IIN_ON_TH [9:0] are the dedicated PMBus configuration bits [53.2 µV ~ 54.4 mV].

The default value is IIN_OFF_TH =0x11A (15 mV) and IIN_ON_TH = 0x0E1 (12 mV).

In case IIN_OFF_TH = 0x000 the input current monitor function is disabled, and no OC detection is performed.

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

IIN_adc_latency.

STPM098C

Functional description

DS14440 - Rev 1

page 50/110

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