AS8228 datasheet(35/123 Pages) AMSCO

35 / 123 page

Data Sheet AS8218 / AS8228

Revision 3.0, 31-May-06

Page 35 of 123

Select Register (Select, 9336h)

MSB

LSB

ledpol

sel_p

sel_i

sel_v

sel_hp

sel_equ

Bit

Symbol Function

ledpol

Selects polarity of LED pulses:

0: negative going pulses

1: positive going pulses (default)

Not used

sel_p

Select between instantaneous and real power for pulse generation

0: instantaneous power

1: real power (low-pass filtered instantaneous power)

sel_i

Select current channel for power calculation (Fast Pulse Gen)

0: i1

1: i2

sel_v

Select voltage channel data

0: selects voltage channel analog input

1: selects the predefined constant ‘vconst’

sel_hp

Select high-pass filter

0: high-pass

1: no high-pass

sel_equ Select equalisation filter

0: equalizer

1: no equalizer

Gain Settings Register (Gains, 9337h)

MSB

LSB

gain_i2[1]

gain_i2[0]

gain_i1[1]

gain_i1[0]

Bit

Symbol Function

Not used

Bit1

Bit0

Gain

gain_i2[1]

gain_i2[0]

Gain setting for current channel 2 modulator

Bit1

Bit0

Gain

gain_i1[1]

gain_i1[0]

Gain setting for current channel 1 modulator

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