AS7058 datasheet(69/199 Pages) AMSOSRAM

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AS7058

Functional description

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Standby control

signal

Function

Timing control

registers

Functionality

Standby Enable 13

Controls and enables common mode

voltage of ECG amplifier

time1_en13

time2_en13

Required for ECG operation only

Standby Enable 14

Controls and enables ECG amplifiers

time1_en14

time2_en14

Required for ECG operation only

The timings which are defined in the timing registers for each control signal define the start of a

block prior to the actual measurement start. The timing registers allow for exact control of the

startup timing behavior of all relevant blocks and it makes sure that all system blocks are

active and properly settled when a measurement is started. Right after the measurement is

finished and the measurement data is written to the FIFO memory of AS7058 all Standby

Enable signals are disabled again and the connected blocks are powered down. Important to

mention is that Standby Enable 1 – Standby Enable 5 signals do have only one timing control

results into a 31.25 µs multiplication factor for these registers like it is also indicated in

Figure 62. The Standby Enable 6 – Standby Enable 14 control signals have two timing control

registers. The time1_enX timing registers are also linked to the 32 kHz clock domain of the

device which results into a 31.25 µs multiplication factor for these registers. The second timing

control register time2_enX which is also linked to each of the Standby Enable 6 – Standby

Enable 14 registers is connected to the 2 MHz clock domain of AS7058 which results in a 1 µs

multiplication factor for these registers. Only one of the two-timing registers for a Standby

Enable signal can be active at a time and the priority is controlled with the register content. In

case a value greater than zero is written to time1_enX register the register content of

time2_enX register is ignored and the timing is calculated and executed based on the register

content of time1_enX register. In case the time1_enX register is set to zero, the content of

domain.

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