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AS8168

Single Phase Average Energy Metering IC with On-Chip Calibration, Stepper Motor Drive and LED Output

austriamicrosystems AG 

Data Sheet AS8168

Parameter

F_cal_sel

F_led_sel

Pulse_lev

Bank01

Sel_def

Description

Select multiplier for

CAL pulse rate

related to

MOP/MON pulse

rate

Select LED pulse

rate [imp/kWh]

Number

of bits

2

3

Central pulse_level 22

value

Select PROM bank 1

0 or 1

Select default or

1

programmed values

Not used

2

Register bits

[28:27] [61:60]

[26:24] [59:57]

[23:2] [56:35]

[1]

[0]

[69:68]

Settings

00 : 8

01 : 16

10 : 32

11 : 64

000 : 100

001 : 200

010 : 400

011 : 800

100 : 1600

101 : 3200

110 : 6400

0 : Bank 0

1 : Bank 1

0 : default

1 : programmed

Value

Default

01

101

0x6A6D4

0

0

00

Total

70

The “Default” values are hard coded on-chip outside the PROM block. Only once the Sel_def bit has been set, are the

PROM parameters selected by the AS8168.

Two PROM banks are defined as ‘Bank 0’ and ‘Bank 1’. This feature allows for a complete reprogramming cycle if necessary.

The required bank is selected with the bit called Bank01.

The calibration of the AS8168 adjusts the specific pulse-level (Pulse_lev), which defines exactly the energy level when a

pulse has to be generated and presented to the output. This pulse-level is used to define a very fast internal pulse rate from

which the external pulse outputs are derived. Therefore, the AS8168 is extremely flexible in defining pulse output rates as

required for a specified kWh meter.

The parameters F_mon_sel, F_cal_sel and F_led_sel are used to define the pulse rates for the pins MOP/MON, CAL and

LED.

The Acreep_sel bit defines the threshold for the current for when no pulses should be transmitted.

Calculations for Calibration

This paragraph describes how to successfully calibrate the AS8168 device. The parameter Pulse_lev is the main parameter

to determine the basic internal (very fast) frequency. This frequency relates to the measured power and is the basis from

which all the output pulse rates namely, MOP/MON, CAL and LED are derived.

Prior to system calibration, the appropriate value for the parameter Pulse_lev must be calculated to produce the required

output pulse rates for MOP/MON, CAL and LED. The calibration exercise must accommodate all system non-idealities that

are present in the meter system.

There are two calibration methods available to find the appropriate value of Pulse_lev, namely:

Revision 1.2, 11-Feb-05

Page 14 of 30

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