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STANDBY
(STDBY)
POWER
DOWN
(PWR_DN)
PROGRAM
REGISTER
(PROG)
ST
D
B
Y
PW
R
_
D
N
ST
D
B
Y
PR
O
G
PWR_DN
PROG
N
O
_O
P
N
O
_O
P
NO_OP
MANUAL
Channel n
(MAN_Ch_n)
AUTO
Ch. Scan
(AUTO)
AUTO Seq.
RESET
(AUTO_RST)
MA
N
_
C
h
_
n
MA
N
_
C
h
_
n
A
U
T
O
NO_OP
AUTO_RST
A
U
TO
_R
ST
N
O
_O
P
NO_OP
MAN_Ch_n
IDLE
Device waits for a
valid command to
initiate conversion
RESET
(RST)
Program Registers
are set to default
values
ST
DB
Y
/ PW
R_
DN
/ PR
OG
MA
N_C
h_n
/ A
UT
O_
RST
NO_OP
RST
MAN_Ch_n / AUTO_RST
STDBY / PWR_DN / PROG
ST
D
B
Y
/ PW
R
_D
N
/
PR
O
G
R
ST
MA
N
_C
h_
n /
A
U
TO
_R
ST
R
ST
IDLE
SBAS686 – JULY 2015
8.4.2 Device Modes
The ADS8694 and ADS8698 support multiple modes of operation that are software programmable. After
powering up, the device is placed into idle mode and does not perform any function until a command is received
from the user.
lists all commands to enter the different modes of the device. After power-up, the program
registers wake up with the default values and require appropriate configuration settings before performing any
conversion. The diagram in
explains how to switch the device from one mode of operation to another.
Figure 79. State Transition Diagram
8.4.2.1 Continued Operation in the Selected Mode (NO_OP)
Holding the SDI line low continuously (equivalent to writing a 0 to all 16 bits) during device operation continues
device operation in the last selected mode (STDBY, PWR_DN, AUTO_RST, or MAN_Ch_n). In this mode, the
device follows the same settings that are already configured in the program registers.
If a NO_OP condition occurs when the device is performing any read or write operation in the program register
(PROG mode), then the device retains the current settings of the program registers. The device goes back to
IDLE mode and waits for the user to enter a proper command to execute the program register read or write
configuration.
Copyright © 2015, Texas Instruments Incorporated
39
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