DS5002FP Maxim, DS5002FP Datasheet - Page 23

• Manufacturer Part Number: DS5002FP
• Description: The DS5002FP secure microprocessor chip is a secure version of the DS5001FP 128k soft microprocessor chip
• Manufacturer: Maxim

Figure 14. Connection to 64k x 8 SRAM
POWER MANAGEMENT
The DS5002FP monitors V
lithium backup. It uses an internal bandgap reference in determining the switch points. These are called V
V
2Bh if the power-fail warning was enabled. Full processor operation continues regardless. When power falls further
to V
above V
source at this time. When V
majority of internal circuits will be disabled and the remaining nonvolatile states will be retained. Any devices
connected V
approximately 0.45V (less a diode drop). This drop varies depending on the load. Low-power SRAMs should be
used for this reason. When using the DS5002FP, 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
Secure Microcontroller User’s Guide has more information on this topic. The trip points V
in the electrical specifications.
CCMIN
CCMIN
, and V
CCMIN
, the DS5002FP invokes a reset state. No further code execution is performed unless power rises back
CCO
. All decoded chip enables and the R/ W signal go to an inactive (logic 1) state. V
LI
respectively. When V
will be powered by the lithium cell at this time. V
CC
CC
drops further to below V
to provide power-fail reset, early warning power-fail interrupt, and switchover to
CC
drops below V
23 of 25
PFW
LI
, the DS5002FP will perform an interrupt vector to location
, internal circuitry switch to the lithium cell for power. The
CCO
is at the lithium battery voltage minus
CCMIN
CC
and V
is still the power
PFW
CC
< V
are listed
LI
. The
PFW
,