L9679E datasheet(114/127 Pages) STMICROELECTRONICS

114 / 127 page

Symbol

Parameter

Comments / Conditions

Min

Typ

Max

Unit

Intra-queue settling time

3.5

µs

Post-ADC

Post- ADC settling time

3.44

µs

ADC conversion time - voltage

4x sampling for each of the 4 conversions in the

queue Design info

54.75

µs

ADC conversion time – current and voltage

8x sampling for DCS, temperature and squib/

pyroswitch loop resistance measurements + 4x

sampling for remaining 2 conversions in the queue

Design info

51.25

µs

1. LSB = (2.5 V / 1024) = 2.44 mV

13.12

Voltage diagnostics (Analog MUX)

All electrical characteristics are valid for the following conditions unless otherwise noted:

-40 °C ≤ Tamb ≤ +105 °C

VSAT_ON(max) ≤ VSAT ≤ 17.5 V

Table 37. Voltage diagnostics (Analog MUX)

Symbol

Parameter

Comments / Conditions

Min Typ Max Units

Ratio_1

Divider ratios

VIN_RANGE_1 = 0.1 V … 2.5 V

V/V

Ratio_4

Divider ratios

VINPUT_RANGE_4 = 1 V … 5.5 V

-3%

+3%

V/V

Ratio_7

Divider ratios

VINPUT_RANGE_7 = 1.5 V … 17.5 V

-3%

+3%

V/V

Ratio_10

Divider ratios

VINPUT_RANGE_10 = 2 V … 25 V

-3% 10 +3%

V/V

Ratio_15

Divider ratios

VINPUT_RANGE_15 = 3 V … 35 V

-3% 15 +3%

V/V

Offset

Divider offset

High impedance

-10

RRATIO_4

Multiplexer input resistance

Multiplexer input to GNDA

kΩ

RRATIO_7

Multiplexer input resistance

Multiplexer input to GNDA

120

kΩ

RRATIO_10

Multiplexer input resistance

Multiplexer input to GNDA

160

kΩ

RRATIO_15

Multiplexer input resistance

Multiplexer input to GNDA

200

kΩ

ILEAK_MUX_ON

Additional multiplexer ON-state input

leakage current

For all divider ratio expect Ratio_1

µA

VMEAS_ACC

Voltage measurement accuracy

ADC total error (±15LSB) plus analog divider error (±3%)

13.13

Temperature sensor

All electrical characteristics are valid for the following conditions unless otherwise noted:

-40 °C ≤ Tamb ≤ +105 °C

VSAT_ON(max) ≤ VSAT ≤ 17.5 V

Table 38. Temperature sensor specifications

Symbol

Parameter

Comments / Conditions

Min

Typ

Max

Unit

TMON_RANGE

Monitoring temperature range

-40

150

°C

TMON_ACC

Monitoring temperature accuracy

-15

°C

L9679E

Electrical characteristics

DS12485 - Rev 8

page 114/127

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