AS8267 datasheet(65/136 Pages) AMSCO

Part #	AS8267

Description	Single-Phase 2-Current Energy Measurement Integrated Circuits with Microcontroller, RTC, Programmable Multi-Purpose I/Os

PDF	136 Pages

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Manufacturer	AMSCO [ams AG]

Direct Link	http://www.ams.com

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65 / 136 page

Data Sheet AS8267 / AS8268

Revision 1.0, 19-Jun-07

Page 65 of 136

Pulse Counter

A synchronous pulse counter is used. It is started after the COUNT bit has been set. The first led pulse is used

for synchronisation. The second led pulse starts counting the reference pulses from the specified I/O input.

Timing:

COUNT

led

Gate

refp

counted refp

CINT

Notes:

1) The COUNT signal is synchronized with ‘led’.

2) COUNT is reset and CINT is set using clk and checking for falling edge on Gate.

3) The PCNT register is only updated when counting is finished.

Example:

Select IO3 as the pulse reference input.

Meter is 220Vmains; Imax = 20A

Meter constant: 1,600imp/kWh

Reference meter constant: 16 million imp/kWh

MPIO

SET_EN0

(9505h):

IO3 bit = 0 (output disabled)

SEL_IN_REFP

(950Ch):

02h

DSP

mconst

(9330h):

07h

(Ideal) Pulse_lev (932Ch – 932Ah) =

220

230

950

570

= 1,193,804

⇒ 12374Ch

⇒ 932Ah: 4Ch

932Bh: 37h

932Ch: 12h

AS8267 Datasheet(PDF) 65 Page - ams AG

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