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MAX16067 Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX16067 Datasheet(HTML) 11 Page - Maxim Integrated Products |
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11 / 47 page  ______________________________________________________________________________________ 11 6-Channel, Flash-Configurable System Manager with Nonvolatile Fault Registers A sequencing delay occurs between each slot and is configured in registers 77h–7Dh as shown in Table 2. Each sequencing delay is stored as an 8-bit value and is calculated as follows: ( ) ( ) 6 a SEQ t 5 10 2 16 b − = × × × + where tSEQ is in seconds, a is the decimal value of the 4 MSBs and b is the decimal value of the 4 LSBs. See Table 3 for example calculations. Enable Input (EN) To initiate sequencing and enable monitoring, the volt- age at EN must be above 1.24V (typ) and the software enable bit in r73h[0] must be set to ‘1.’ To power down and disable monitoring, either pull EN below 1.215V (typ) or set the software enable bit to ‘0.’ See Table 4 for the software enable bit configurations. Connect EN to ABP if not used. If a fault condition occurs during the power-up cycle, the EN_OUT_ outputs are powered down immediately, regardless of the state of EN. In the monitoring state, if EN falls below the threshold, the sequencing state machine begins the power-down sequence. If EN rises above the threshold during the power-down sequence, the sequence state machine continues the power-down sequence until all the channels are powered off and then the device immediately begins the power-up sequence. When in the monitoring state, and when EN falls below the undervoltage threshold, a register bit, ENRESET (r20h[2]), is set to a ‘1.’ This register bit latches and must be cleared through software. This bit indicates if RESET asserted low due to EN going under the threshold. The POR state of ENRESET is ‘0’. The bit is only set on a fall- ing edge of the EN comparator output or the software enable bit. If operating in latch-on fault mode, toggle EN or toggle the software enable bit to clear the latch condition and restart the device once the fault condition has been removed. Table 1. Current Sequencer Slot Table 2. Slot Delay Register REGISTER ADDRESS BIT RANGE DESCRIPTION 21h [3:0] Current-sequencer state 0000 = Slot0 0001 = Slot1 0010 = Slot2 0011 = Slot3 0100 = Slot4 0101 = Slot5 0110 = Slot6 0111 = Power-on mode 1000 = Fault state 1001 to 1111 = Unused [7:4] Reserved REGISTER ADDRESS FLASH ADDRESS BIT RANGE DESCRIPTION 77h 277h [7:0] Sequence slot 0 to slot 1 delay 78h 278h [7:0] Sequence slot 1 to slot 2 delay 79h 279h [7:0] Sequence slot 2 to slot 3 delay 7Ah 27Ah [7:0] Sequence slot 3 to slot 4 delay 7Bh 27Bh [7:0] Sequence slot 4 to slot 5 delay 7Ch 27Ch [7:0] Sequence slot 5 to slot 6 delay 7Dh 27Dh [7:0] Sequence slot 6 to power-on state delay |
Similar Part No. - MAX16067 |
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Similar Description - MAX16067 |
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