X40431 XICOR [Xicor Inc.], X40431 Datasheet - Page 7

• Manufacturer Part Number: X40431
• Description: 4kbit EEPROM, Triple Voltage Monitor with Integrated CPU Supervisor
• Manufacturer: XICOR [Xicor Inc.]

X40430/X40431 – Preliminary Information
Figure 6. V
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.
REV 1.2.3 11/28/00
TRIP
Old V
New V
X
Set/Reset Sequence (X = 1, 2, 3)
applied + Error
X
applied =
Error < -MDE
NO
No
Set Higher V
Set Higher V
V
Apply V
V
Desired V
TRIP
TRIPX
Output Switches?
Desired V
Actual V
Present Value
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Reset Sequence
Decrease V
Desired
Execute
Execute
V
CC
Execute
DONE
Programming
TRIPX
TRIP
TRIPX
and Voltage
X
TRIPX –
Error < | MDE |
TRIPX
Sequence
YES
YES
Sequence
to V
X
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.
X
Error > +MDE
Execute Reset V
Old V
Let: MDE = Maximum Desired Error
Note: X = 1, 2, 3
Vx = V
Characteristics subject to change without notice.
New V
X
Sequence
applied - Error
CC
X
, V2MON, V3MON
applied =
TRIPX
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