Datasheet

STPMC1 Terminology

Doc ID 15728 Rev 7 15/77

7 Terminology

7.1 Measurement error

The error associated with the energy measured by the STPMC1 is defined as:

7.2 Conventions

The lowest analog and digital power supply voltage is called V

which represents the

system ground (GND). All voltage specifications for digital input/output pins are referred to

GND.

Positive currents flow into a pin. “Sinking current” is the current flowing into the pin, and so it

is positive. “Sourcing current” is the current flowing out of the pin, and so it is negative.

Signal timing specifications treated by a digital control part are relative to XTAL1. This signal

is provided from the crystal oscillator or from an external source as specified in paragraph

9.4

Signal timing specifications of the SPI interface are relative to the SCLNLC. There is no

direct relationship between the clock (SCLNLC) of the SPI interface and the clock of the

DSP block (XTAL1).

A positive logic convention is used in all equations.

EnergyTrue

EnergyTrue)reading(1SPMC

ErrorPercentage

−