AS7038RB datasheet(83/127 Pages) AMSOSRAM

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AS7038RB

Functional Description

Datasheet

• PUBLIC

DS000726

• v2-00 • 2021-Jun-02

126

│ 82

DAC Switching

Figure 104:

Electrical Analog Front End DAC Level Switching

If bit dac_mode is not zero, the DAC switches its codes between dac1_value and dac2_value on the

beginning of every/every 2nd/every 4th sequencer cycle where the ADC is converting the electrical

frontend channel. ADC conversions of any other channel do not switch the DAC.

Input Pins

Four general purpose pins and ECG_REF can be used either as configurable GPIO pin or as analog

input pins for the electrical analog front end. The analog inputs can be configured to setup different

amplifier topologies.

7.1.15

EAF (Electrical Analog Frontend) Registers

EAF_CFG (Address 0x70)

Figure 105:

EAF_CFG Register

Addr: 0x70

EAF_CFG

Bit

Bit Name

Default

Access

Bit Description

7:4

Do not use

eaf_enab

0: EAF bias deactivated

1: EAF bias activated (need to be set for

any functions of the EAF are used).

eaf_enab_dac

0: DAC inside the EAF OFF

Example with dac_mode=1

VDAC

sequencer

start period

ADC

convert

start

ADC

convert

start

ADC

convert

seq_adc

dac1_value

dac2_value

dac1_value

t [not to scale]

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