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DS5000FP-16 Datasheet(PDF) 7 Page - Dallas Semiconductor |
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DS5000FP-16 Datasheet(HTML) 7 Page - Dallas Semiconductor |
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7 / 22 page  DS5000FP 7 of 22 POWER MANAGEMENT The DS5000FP monitors power to provide Power-Fail Reset, early warning Power-Fail Interrupt, and switchover to lithium backup. It uses the lithium cell at VLI as a reference in determining the switch points. These are called VPFW, VCCMIN, and VLI respectively. When VCC drops below VPFW, the DS5000FP will perform an interrupt vector to location 2Bh if the power-fail warning was enabled. Full processor operation continues regardless. When power falls further to VCCMIN, the DS5000FP invokes a reset state. No further code execution will be performed unless power rises back above VCCMIN. CE1 , CE2 , R/ W go to an inactive (logic 1) state. Any address lines that are high (due to encryption) will follow VCC, except for BA14, which is lithium backed. VCC is still the power source at this time. When VCC drops further to below VLI, internal circuitry will switch to the lithium cell for power. The majority of internal circuits will be disabled and the remaining nonvolatile states will be retained. The lithium cell will power any devices connected to VCCO at this time. VCCO will be at the lithium battery voltage less a diode drop. This drop will vary depending on the load. Low-leakage SRAMs should be used for this reason. When a module is used, the lithium cell is selected by Dallas so absolute specifications are provided for the switch thresholds. When using the DS5000FP, the user must select the appropriate battery. The following formulas apply to the switch function: VPFW = 1.45 x VLI VCCMIN = 1.40 x VLI VLI Switch = 1.0 x VLI MEMORY MAP OF THE DS5000FP Figure 2 |
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