STPM32 datasheet(16/89 Pages) STMICROELECTRONICS

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Terminology

6.1

Conventions

The lowest analog and digital power supply voltage is named GND and represents the system ground. All voltage

specifications for digital input/output pins are referred to GND. The highest power supply voltage is named VCC.

The highest core power supply is internally generated and is named VDDA. Positive currents flow to a pin. Sinking

current means that the current is flowing to the pin and it is positive. Sourcing current means that the current is

flowing out of the pin and it is negative. A positive logic convention is used in all equations.

Table 7. Convention table

Type

Convention

Example

Pins

All capitals

VDDA

Internal signal

All capitals are italic

VDDA

Configuration bit

All capitals are underlined

ROC1

All capitals are bold

DSP_CR1

6.2

Measurement error

The power measurement error is defined by the following equation:

(1)

e% =measuredpower−truepower

truepower

All measurements come from the comparison with a higher class power (0.02% error) meter reference. Output

bitstream of modulator is indicated as bsV and bsC for voltage and current channel respectively.

6.3

ADC offset error

This is the error due to DC component associated with the analog inputs of the A/D converters. Due to the internal

automatic DC offset cancellation, the STPM3x measurement is not affected by DC components in voltage and

current channel. DC offset cancellation is implemented in DSP thanks to a dedicated HPF.

6.4

Gain error

The gain error is due to the signal channel gain amplifiers.This is the difference between the measured ADC code

and the ideal output code. The difference is expressed as percentage of the ideal code.

STPM32, STPM33, STPM34

Terminology

DS10272 - Rev 13

page 16/89

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