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X4283S8IZ Datasheet(PDF) 7 Page - Intersil Corporation

Part # X4283S8IZ
Description  CPU Supervisor with 128K EEPROM
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

X4283S8IZ Datasheet(HTML) 7 Page - Intersil Corporation

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7
FN8121.1
May 23, 2006
Figure 4. VTRIP Programming Sequence
Control Register
The Control Register provides the user a mechanism
for changing the Block Lock and Watchdog Timer set-
tings. The Block Lock and Watchdog Timer bits are
nonvolatile and do not change when power is
removed.
The Control Register is accessed at address FFFFh. It
can only be modified by performing a byte write opera-
tion directly to the address of the register and only one
data byte is allowed for each register write operation.
Prior to writing to the Control Register, the WEL and
RWEL bits must be set using a two step process, with
the whole sequence requiring 3 steps. See "Writing to
the Control Register" below.
The user must issue a stop after sending this byte to
the register to initiate the nonvolatile cycle that stores
WD1, WD0, BP2, BP1, and BP0. The X4283, X4285
will not acknowledge any data bytes written after the
first byte is entered.
VTRIP Programming
Apply 5V to VCC
Decrement VCC
RESET pin
goes active?
Measured VTRIP -
Desired VTRIP
DONE
Execute
Sequence
Reset VTRIP
Set VCC = VCC Applied =
Desired VTRIP
Execute
Sequence
Set VTRIP
New VCC Applied =
Old VCC Applied + Error
(VCC = VCC - 50mV)
Execute
Sequence
Reset VTRIP
New VCC Applied =
Old VCC Applied - Error
Error
≤ –Emax
–Emax < Error < Emax
YES
NO
Error
≥ Emax
Emax = Maximum Allowed VTRIP Error
X4283, X4285


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