STPMC1 datasheet(38/77 Pages) STMICROELECTRONICS

部件名	STPMC1

功能描述	Programmable poly-phase energy calculator IC

PDF	77 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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38 / 77 page

Theory of operation

STPMC1

38/77

Doc ID 15728 Rev 6

The ACR, ACS and ACT registers (bits [7:0], see paragraph 9.17.7) holds the information

needed for this calculation.

Let us indicate tRS, tST, tTR, the delays between R, S and T phases. It is:

Equation 1

tRS + tST + tTR = T = 1 /

Concatenating ACT[7:0], ACS[7:0], ACR[7:0] bytes, two 12 bits vectors defined as below are

obtained:

ACT[7:0], ACS[7:0], ACR[7:0] = Asr[12, 10:0], Art[12, 10:0]

The delay times are calculated with the following formulas:

Equation 2

Equation 3

From

Equation 1, Equation 2 and Equation 3 it is possible to retrieve phase delays tRS, tST

and tTR.

Figure 13.

Phase delay

tRS

tST

tTR

[]

() []

MCLK

Asr

time

⋅

⎟

⎠

⎞

⎜

⎝

⎛

−

[]

() []

MCLK

Art

time

⋅

⎟

⎠

⎞

⎜

⎝

⎛

−

STPMC1 数据表(PDF) 38 Page - STMicroelectronics

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