X40420/X40421 – Preliminary
Figure 6. V
TRIPX
Set/Reset Sequence (X = 1, 2)
V
TRIPX
Programming
Vx = V
CC
, VxMON
Note:
X = 1, 2
Let:
MDE = Maximum Desired Error
No
Desired
V
TRIPX
<
Present Value
YES
Execute
V
TRIPX
Reset Sequence
MDE
+
Acceptable
Desired Value
Error Range
Y
R
Error > MDE
+
MDE
–
Error = Actual - Desired
Set V
X
= desired V
TRIPX
New V
X
applied =
Old V
X
applied + | Error |
Execute
Set Higher V
X
Sequence
Apply V
CC
and Voltage
> Desired V
TRIPX
to V
X
IN
A
YES
| Error | < | MDE |
New V
X
applied =
Old V
X
applied - | Error |
Execute Reset V
TRIPX
Sequence
Error < MDE
–
PR
WEL: Write Enable Latch (Volatile)
The WEL bit controls the access to the memory and to
the Register during a write operation. This bit is a vola-
tile latch that powers up in the LOW (disabled) state.
While the WEL bit is LOW, writes to any address,
including any control registers will be ignored (no
acknowledge will be issued after the Data Byte). The
WEL bit is set by writing a “1” to the WEL bit and
zeroes to the other bits of the control register.
EL
I
M
DONE
NO
Decrease V
X
Output Switches?
Actual V
TRIPX -
Desired V
TRIPX
Once set, WEL remains set until either it is reset to 0
(by writing a “0” to the WEL bit and zeroes to the other
bits of the control register) or until the part powers up
again. Writes to the WEL bit do not cause a high volt-
age write cycle, so the device is ready for the next
operation immediately after the stop condition.
REV 1.2.14 7/12/02
www.xicor.com
Characteristics subject to change without notice.
7 of 25
XICOR [ XICOR INC. ]
