MAX16065 Datasheet, PDF(12/61 Page) Maxim Integrated Products – 12-Channel/8-Channel, Flash-Configurable System Managers with Nonvolatile Fault Registers

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12-Channel/8-Channel, Flash-Configurable System

Managers with Nonvolatile Fault Registers

Table 1. Current Sequencer Slot

ADDRESS

BIT RANGE

DESCRIPTION

Current Sequencer State:

00000 = Slot 0

00001 = Slot 1

00010 = Slot 2

00011 = Slot 3

00100 = Slot 4

00101 = Slot 5

00110 = Slot 6

00111 = Slot 7

[4:0]

01000 = Slot 8

21h

01001 = Slot 9

01010 = Slot 10

01011 = Slot 11

01100 = Slot 12

01101 = Secondary sequence monitoring mode

01110 = Primary sequence fault

01111 = Primary sequence monitoring mode

10000 = Secondary sequence fault

10001 to 11111 = Reserved

[7:5]

Reserved

Multiple Sequencing Groups

The MAX16065/MAX16066 sequencing slots can be

split into two groups: the primary sequence and the sec-

ondary sequence. The last slot of the primary sequence

is selected using register bits r7Dh[7:4]. The second-

ary sequence begins at the slot after the one speci-

fied in register bits 7Dh[7:4]. The primary sequence

is controlled by the EN input and the software enable

bit in r73h[0]. Outputs assigned to slots in the primary

sequence turn on, and monitoring begins for inputs

assigned to these slots. RESET deasserts after the pri-

mary sequence and timeout period completes.

To initiate secondary sequencing and monitoring, set

the software enable 73h[1] bit to 1. Additionally, if GPIO_

is configured as EN2 then both the software enable 2

and EN2 must be high. Outputs assigned to slots in the

secondary sequence turn on, and monitoring begins for

inputs assigned to these slots. If a GPIO_ is configured

as the RESET2 output, it deasserts after the secondary

sequence and timeout period completes.

If a critical fault occurs in the primary sequence group,

both sequence groups automatically shut down. If a

critical fault occurs in the secondary sequence group,

then just the outputs assigned to slots in the second-

ary sequence turn off. The failing slot in secondary

sequence is stored in r1Dh.

Multiple sequencing groups can be used to conserve

power by powering down secondary systems when not

in use.

Enable and Enable2

To initiate sequencing/tracking and enable monitoring,

the voltage at EN must be above 1.4V and the software

enable bit in r73h[0] must be set to â1.â To power down

and disable monitoring, either pull EN below 1.35V or

set the Software Enable bit to â0.â See Table 2 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, a register bit, ENRESET,

is set to a â1â when EN falls below the undervoltage

threshold. 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 â0â. The bit is only set on a falling edge

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