COMBOSMARTMETER datasheet(51/60 Pages) TI1

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Power Supplies

RESET

RST

Start Using the Device

POR

18 t

CLK

ADS131E04

ADS131E06

ADS131E08

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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 (tPOR) executes to set the digital portion of the chip. The reset pin, or reset

command, should be issued after tPOR 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

tPOR

Wait after power-up until reset

216

tCLK

tRST

Reset low width

tCLK

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

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