STPM32 datasheet(26/121 Pages) STMICROELECTRONICS

26 / 121 page

Terminology

STPM32, STPM33, STPM34

26/121

DS10272 Rev 8

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.

6.2

Measurement error

The power measurement error is defined by the following equation:

Equation 1

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.

Table 8. 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

measuredpower truepower

–

truepower

-----------------------------------------------------------------------------------

STPM32 Datasheet(PDF) 26 Page - STMicroelectronics

STPM32 Datasheet(HTML) 26 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL