Datasheet

Power Supplies
RESET
t
RST
Start Using the Device
t
POR
18 t
CLK
ADS131E04
ADS131E06
ADS131E08
www.ti.com SBAS561A –JUNE 2012–REVISED APRIL 2013
POWER-UP SEQUENCING
Before device power-up, all digital and analog inputs must be low. At power-up, these signals should remain low
until the power supplies have stabilized, as shown in Figure 49. Once the supply voltages have reached the final
value, the digital power-on reset (t
POR
) executes to set the digital portion of the chip. The reset pin, or reset
command, should be issued after t
POR
and when the VCAP1 voltage is greater than 800 mV. The VCAP1 pin
charge time is set by RC time constant; see Figure 28. If the VCAP1 capacitor is 22 µF, a reset can be issued
within 400 ms after power up. 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 13.
Figure 49. Power-Up Timing Diagram
Table 13. 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 1 t
CLK
SETTING THE DEVICE FOR BASIC DATA CAPTURE
This 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 system.
It is recommended that this procedure be followed initially to get familiar with the device settings. When this
procedure is verified, the device can be configured as needed. For details on the timings for commands refer to
the appropriate sections in the data sheet. The flow chart of Figure 50 details the initial ADS131E0x configuration
and setup.
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Product Folder Links: ADS131E04 ADS131E06 ADS131E08