Datasheet

Set = 1
Set = 1
Wait f
PDWN
RESET
or 1 s for
Power-On Reset
// Delay for Power-On Reset and Oscillator Start-Up
// If START is Tied High, After This Step
// Toggles at f / 8192DRDY
CLK
Set CLKSEL Pin = 1
and Wait for Oscillator
to Wake Up
No
Analog and Digital Power-Up // Follow Power-Up Sequencing
External
Clock
Set CLKSEL Pin = 0
and Provide External Clock
f = 2.048 MHz
CLK
Yes
Set PDB_REFBUF = 1
and Wait for Internal Reference
to Settle
Write Certain Registers,
Including Input Short
Set START = 1
// Activate Conversion
// After This Point Should Toggle at
// f / 8192
DRDY
CLK
// Set Device for DR = f / 4096
WREG CONFIG1 96h
WREG CONFIG2 C0h
// Set All Channels to Input Short
WREG CHnSET 01h
MOD
Yes
RDATAC
// Put the Device Back in RDATAC Mode
RDATAC
Capture Data
and Check Noise
// Look for and Issu sDRDY e 24 + n 24 SCLK´
Set Test Signals
Capture Data
and Test Signal
// Activate a (1 mV V / 2.´ 4) Square-Wave Test Signal
// On All Channels
SDATAC
WREG CONFIG2 D0h
WREG CHnSET 05h
RDATAC
REF
// Look for and Issu sDRDY e 24 + n 24 SCLK´
External
Reference
// If Using Internal Reference, Send This Command
¾WREG CONFIG3 E0h
No
Send SDATAC
Command
// Device Wakes Up in RDATAC Mode, so Send
// SDATAC Command so Registers can be Written
SDATAC
Issue Reset Pulse,
Wait for 18 t s
CLK
// Activate DUT
// can be Either Tied Permanently Low
// Or Selectively Pulled Low Before Sending
// Commands or Reading or Sending Data from or to the Device
CS
ADS1299
SBAS499A –JULY 2012–REVISED AUGUST 2012 www.ti.com
Figure 56. Initial Flow at Power-Up
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Product Folder Link(s): ADS1299