L9678P datasheet(162/203 Pages) STMICROELECTRONICS

162 / 203 page

System voltage diagnostics

L9678P, L9678P-S

162/203

DocID029274 Rev 3

For measurements other than voltage (current, resistance, temperature etc.) the ranges are

specified in the electrical parameters section of the relevant block.

13.1

Analog to digital algorithmic converter

The device hosts an integrated 10 bit Analog to Digital converter, running at a clock

frequency of 16MHz. The ADC output is processed by a D to D converter with the following

functions:



Use of trimming bits to recover ADC offset and gain errors;



Digital low-pass filtering;



Conversion from 12 to 10 bits.

10 bits data are filtered inside the digital section. The number of samples that are filtered

varies depending on the chosen conversion. As per Section 5.1.2: System configuration

temperature measurements defaults to 8. The number of samples for all other

measurements defaults to 4. The sample number can be configured by accessing the

SYS_CFG register. After low pass filter, the residual total error is ±4 LSB. This error figure

SFx

VRESDIAG

GPODx

GPOSx

VIN

VBATMON

WAKEUP

ISOK

VSUP

WDTDIS

RSUx

DCSx

VDDQ

VDD5

VDD3V3

VINT3V3

Bandgap (BGR/BGM)

TEMP

Table 12. Diagnostics divider ratios (continued)

Measurements

Divider Ratio

15:1

10:1

7.125:1

7:1

4:1

1:1

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