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X4643S8-4.5A Datasheet(PDF) 5 Page - Intersil Corporation |
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X4643S8-4.5A Datasheet(HTML) 5 Page - Intersil Corporation |
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5 / 21 page  5 FN8123.0 March 29, 2005 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, and WD0. The X4643/5 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 X4643, X4645 |
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