AS7000 datasheet(27/92 Pages) AMSCO

27 / 92 page

ams Datasheet

Page 27

[v1-12] 2018-Feb-26

Document Feedback

AS7000 − Detailed Description

Sequencer

In order to synchronize the LED-currents, the integration time

and the ADC-sampling time, a built in sampling Sequencers can

be used. The sequencer generates the 16 bit-timings based on

a 1μs clock. The results of the analog to digital conversion are

automatically stored in a pipeline buffer or in register adc_data.

The timings can be programmed with following registers (apply

for man_mode=0):

Figure 25:

Sequencer Control Registers Overview

Note(s):

1. The lowest data value of all registers except seq_count, seq_div, seq_adc_inc, seq_adc_inc_fract and seq_adc_fract is 1.

Description

seq_div

Divider of the 1μs input clock

seq_count

Number of measurements in one sequence

seq_start

Writing 1 starts the sequencer, 0 stops the sequencer

seq_period

Time of one measurement cycle

seq_led_start

Start time of the LED drivers within one cycle

seq_led_stop

Stop time of the LED drivers within one cycle

seq_itg_start

Start time of the integrator

seq_itg_stop

Stop time of the integrator

seq_sdp_start

Start time of the synchronous demodulator’s positive multiplication

seq_sdp_stop

Stop time of the synchronous demodulator’s positive multiplication

seq_sdm1_start

Start time of the synchronous demodulator’s negative multiplication 1

seq_sdm1_stop

Stop time of the synchronous demodulator’s negative multiplication 1

seq_sdm2_start

Start time of the synchronous demodulator’s negative multiplication 2

seq_sdm2_stop

Stop time of the synchronous demodulator’s negative multiplication 2

seq_adc, seq_adc_fract

Sampling position of the ADC in single steps / in 1/16th steps

seq_adc_inc, seq_adc_inc_fract

Increment of the sampling position of the ADC after each measurement in

single steps / in 1/16th steps

sd_subs

Subsampling ratio between sequencer frequency and ADC sampling

frequency – use for adjusting the ADC sampling frequency at a lower

speed than the sequencer cycle frequency

AS7000 датащи(PDF) 27 Page - ams AG

AS7000 датащи(HTML) 27 Page - ams AG

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92

датащи скачать

ссылки URL