X5643/X5645
Characteristics subject to change without notice.
4 of 22
Resetting the V
This procedure sets the V
level. For example, if the current V
V
TRIP
is reset, the new V
1.7V. This procedure must be used to set the voltage to
a lower value.
TRIP
Voltage
TRIP
to a “native” voltage
TRIP
is 4.4V and the
is something less than
TRIP
To reset the V
and 5.5V to the V
pin, and the SCK pin HIGH. RESET/RESET and SO
pins are left unconnected. Then apply the programming
voltage V
P
to the SI pin ONLY and pulse CS/WDI LOW
then HIGH. Remove V
P
and the sequence is complete.
TRIP
voltage, apply a voltage between 2.7
CC
pin. Tie the CS/WDI pin, the WP
Figure 2. Reset V
TRIP
Voltage
SCK
SI
V
CC
V
P
CS
Figure 3. V
TRIP
Programming Sequence Flow Chart
V
TRIP
Programming
Apply 5V to V
CC
Decrement V
CC
(V
CC
= V
CC
- 10mV)
RESET pin
goes active
Measured V
TRIP
-
Desired V
TRIP
DONE
Execute
Reset V
TRIP
Sequence
Set V
CC
= V
CC
Applied =
Desired V
TRIP
Execute
Set V
TRIP
Sequence
New V
CC
Applied =
Old V
CC
Applied + Error
Execute
Reset V
Sequence
New V
CC
Applied =
Old V
CC
Applied - Error
Error
≥
Emax
Error < Emax
YES
NO
Error > Emax
Emax = Maximum Desired Error