Datasheet

Power Supplies
RESET
t
RST
StartUsingtheDevice
t
POR
18t
CLK
ADS1194, ADS1196
ADS1198
www.ti.com 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 t
POR
, then transmit a RESET pulse. After releasing RESET,
the configuration register must be programmed, see the CONFIG1: Configuration Register 1 subsection of the
Register Map section for details. The power-up sequence timing is shown in Table 11.
Figure 57. Power-Up Timing Diagram
Table 11. Power-Up Sequence Timing
SYMBOL DESCRIPTION MIN TYP MAX UNIT
t
POR
Wait after power-up until reset 2
16
t
CLK
t
RST
Reset low width 2 t
CLK
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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