MAX16068 datasheet(19/40 Pages) MAXIM

Part #	MAX16068

Description	6-Channel, Flash-Configurable System Manager with Nonvolatile Fault Registers

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Manufacturer	MAXIM [Maxim Integrated Products]

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______________________________________________________________________________________ 19

6-Channel, Flash-Configurable System Manager

with Nonvolatile Fault Registers

Set r74h[4:3] to a value other than ‘00’ to select autoretry

mode (see Table 14). In this configuration, the device

stops monitoring after a critical fault event then moni-

tors again following the boot-up delay plus 20ms (see

the Boot-Up Delay section). Use r74h[2:0] to select an

autoretry delay from 20ms to 1.6s. See Table 14 for more

information on setting the autoretry delay.

When fault information is stored in flash (see the Critical

Faults section) and autoretry mode is selected, set an

autoretry delay greater than the time required for the

storing operation. When fault information is stored in

flash and latch-on-fault mode is chosen, toggle EN or

reset the software enable bit only after the completion

of the storing operation. When saving information about

the failed lines only, ensure a delay of at least 102ms

before the restart procedure. Otherwise, ensure a mini-

mum 153ms timeout, to ensure that ADC conversions

are completed and values are stored correctly in flash.

Reset Output

The reset output, RESET, indicates the status of the

monitored inputs. It asserts during the boot phase and

deasserts following the reset timeout period once the

monitored input voltage is within the undervoltage/over-

voltage.

During normal monitoring, RESET can be configured to

assert when any combination of MON_ inputs violates

configurable combinations of undervoltage or overvolt-

age thresholds. Select the combination of MON_ inputs

using r3Ch[5:0] and r3Dh[5:0]. Note that MON_ inputs

configured as critical faults always cause RESET to

assert regardless of these configuration bits.

RESET can be configured as push-pull or open drain

using r3Bh[3], and active high or active low using

r3Bh[2]. Select the reset timeout by loading a value from

Table 15 into r3Bh[7:4].

To generate a one-shot pulse on RESET, write a ‘1’ into

r3Bh[0]. The pulse width is the configured reset timeout.

Register bit r3Bh[0] clears automatically (see Table 15).

The current state of RESET can be checked by reading

r20h[0].

Table 14. Autoretry Configuration

REGISTER

ADDRESS

FLASH

ADDRESS

BIT

RANGE

DESCRIPTION

74h

274h

[2:0]

Retry Delay

000 = 20ms

001 = 40ms

010 = 80ms

011 = 150ms

100 = 280ms

101 = 540ms

110 = 1s

111 = 2s

[4:3]

Autoretry/Latch Mode

00 = Latch

01 = Retry 1 time

10 = Retry 3 times

11 = Always retry

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