ASD1194 datasheet(65/76 Pages) TI

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Power Supplies

RESET

RST

StartUsingtheDevice

POR

18t

CLK

ADS1194, ADS1196

ADS1198

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SBAS471C

– APRIL 2010 – REVISED NOVEMBER 2011

POWER-UP SEQUENCING

Before device power-up, all digital and analog inputs must be low. At the time of power-up, all of these signals

should remain low until the power supplies have stabilized, as shown in Figure 57. At this time, begin supplying

the master clock signal to the CLK pin. Wait for time tPOR, then transmit a RESET pulse. After releasing RESET,

the configuration register must be programmed, see the CONFIG1: Configuration Register 1 subsection of the

Figure 57. Power-Up Timing Diagram

Table 11. Power-Up Sequence Timing

SYMBOL

DESCRIPTION

MIN

TYP

MAX

UNIT

tPOR

Wait after power-up until reset

216

tCLK

tRST

Reset low width

tCLK

SETTING THE DEVICE FOR BASIC DATA CAPTURE

The following section outlines the procedure to configure the device in a basic state and capture data. This

procedure is intended to put the device in a data sheet condition to check if the device is working properly in the

user's system. It is recommended that this procedure be followed initially to get familiar with the device settings.

Once this procedure has been verified, the device can be configured as needed. For details on the timings for

commands refer to the appropriate sections in the data sheet. Also, some sample programming codes are added

for the ECG-specific functions. Figure 58 illustrates a flowchart outlining the initial flow at power-up.

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ASD1194 Datasheet(PDF) 65 Page - Texas Instruments