AS7030B datasheet(52/129 Pages) AMSCO

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AS7030B

Functional Description

Datasheet

• PUBLIC

DS000716

• v1-00 • 2020-Jun-10

128

│ 51

Addr: 0x32

SEQ_START

Bit

Bit Name

Default

Access

Bit Description

seq_start_gpio

R_PUSH

After programming, the sequencer waits for a

synchronization pulse via GPIO (see register

GPIO_SYNC).

For all released ADC channels a value is

recorded per synchronization pulse (see register

ADC_CHANNEL).

seq_start_sync

R_PUSH

Similar to seq_start, but the sequencer will wait

for overflow of the frequency divider that feeds all

the switched-cap filters. This means 1) That it

could take anything between 0 and 8 ms before

the sequencer actually starts. 2) That the

generated frequencies are in phase with the

sequencer. For this to have any effect, the

sequencer period should be selected with the

selected frequencies (sd_bw, hp_freq) in mind.

seq_start

R_PUSH

Writing 1 starts the sequencer(s) in the according

to the configuration and upon rising edge of

seq_start ADC selects first channel.

Writing 0 stops the sequencer(s).

In manual mode, writing 1 starts one ADC

conversion but does not initialize the ADC

channel selection. Reading returns 1 if the

sequencer is running (sequencer mode),

respectively if the ADC is converting (manual

mode)

With the SEQ_START register sets the configured sequencer can be started

SEQ_PER (Address 0x33)

Figure 45:

SEQ_PER Register

Addr: 0x33

SEQ_PER

Bit

Bit Name

Default

Access

Bit Description

7:0

seq_period

t_period

Sequencer period T = t_period * (seq_div+1) *

1 µs

The SEQ_PER register sets one measurement cycle of the sequencer.

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