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4285GZ View Datasheet(PDF) - Intersil

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4285GZ Datasheet PDF : 22 Pages
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Figure 4. VTRIP Programming Sequence
X4283, X4285
VTRIP Programming
Execute
Reset VTRIP
Sequence
Set VCC = VCC Applied =
Desired VTRIP
New VCC Applied =
Old VCC Applied + Error
Execute
Set VTRIP
Sequence
Apply 5V to VCC
Decrement VCC
(VCC = VCC - 50mV)
New VCC Applied =
Old VCC Applied - Error
Execute
Reset VTRIP
Sequence
NO
RESET pin
goes active?
YES
Error –Emax
Emax = Maximum Allowed VTRIP Error
Measured VTRIP -
Desired VTRIP
Error Emax
–Emax < Error < Emax
DONE
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.
7
FN8121.1
May 23, 2006
 

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