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AD5100(Rev0) View Datasheet(PDF) - Analog Devices

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AD5100 Datasheet PDF : 36 Pages
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AD5100
Floating WDI Input
If the WDI pin is floating, the watchdog function is disabled by
default. However, floating watchdog can be enabled in the RESET
configuration register such that a broken WDI connection or
any unusual condition that makes WDI float triggers the reset.
Register 0x0D[3] = 0: floating WDI input activates RESET
Register 0x0D[3] = 1: floating WDI input does not activate
RESET
Enabling or disabling the floating WDI feature can be changed
dynamically, provided that the OTP fuse of the RESET configura-
tion register is not blown or that the OTP overridden function
is selected.
MANUAL RESET INPUT
Manual reset (MR) is an active low input to the AD5100 and
has an internal pull-up resistor to V3MON. If the input signal on
the MR pin goes low, RESET is activated. MR can be driven
from a CMOS logic signal.
The MR and RESET timing diagrams are shown in Figure 15.
Note that RESET is activated after tMR_DELAY and is held for
tRS_HOLD after the MR signal has gone high again.
MR has the highest priority in triggering the RESET over any
other monitoring inputs.
MR
< tMR_GLITCH
tMR
tMR_DELAY
tRS_HOLD*
RESET
* = PROGRAMMABLE
Figure 15. Manual Reset (MR) Timing Diagram
Rev. 0 | Page 18 of 36
 

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