DS5001FP-12-44 Dallas Semiconducotr, DS5001FP-12-44 Datasheet - Page 10

• Manufacturer Part Number: DS5001FP-12-44
• Description: 128k Soft Microprocessor Chip
• Manufacturer: Dallas Semiconducotr

Figure 6. DS5001FP CONNECTION TO 64k x 8 SRAM
POWER MANAGEMENT
The DS5001FP monitors V
over to lithium backup. It uses an internal bandgap reference in determining the switch points. These are
called V
interrupt vector to location 2Bh if the power-fail warning was enabled. Full processor operation continues
regardless. When power falls further to V
execution is performed unless power rises back above V
signal go to an inactive (logic 1) state. V
to below V
disabled and the remaining nonvolatile states are retained. Any devices connected V
the lithium cell at this time. V
varies depending on the load. Low power SRAMs should be used for this reason. When using the
DS5001FP, the user must select the appropriate battery to match the RAM data retention current and the
desired backup lifetime. Note that the lithium cell is only loaded when V
more information on this topic. The trip points V
PFW
LI
, V
, internal circuitry switches to the lithium cell for power. The majority of internal circuits are
CCMIN
, and V
CC
LI
, respectively. When V
CCO
to provide power-fail reset, early warning power-fail interrupt, and switch
is at the lithium battery voltage minus approximately 0.45V. This drop
CC
CCMIN
is still the power source at this time. When V
CCMIN
, the DS5001FP invokes a reset state. No further code
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CC
and V
drops below V
CCMIN
PFW
. All decoded chip enables and the R/
are listed in Electrical Specifications.
PFW
CC
, the DS5001FP performs an
< V
LI
. The User’s Guide has
CCO
CC
are powered by
drops further
DS5001FP
W