MAX16068 datasheet(35/40 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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______________________________________________________________________________________ 35

6-Channel, Flash-Configurable System Manager

with Nonvolatile Fault Registers

Applications Information

Device Behavior at Power-Up

When VCC is ramped from 0V, the RESET output is

high impedance until VCC reaches 1.4V, at which point

RESET goes low. All other outputs are high impedance

until VCC reaches 2.7V, then the flash contents are cop-

ied into register memory. This takes 150Fs (max) after

which the outputs assume their programmed states.

Programming the MAX16068 in Circuit

The MAX16068 can be programmed in the application

circuit by taking into account the following points during

circuit design:

U

The MAX16068 needs to be powered from an inter-

mediate voltage bus or an auxiliary voltage supply so

programming can occur even when the board’s power

supplies are off. This could also be achieved by using

ORing diodes so that power can be provided through

the programming connector.

U

The SMBus or JTAG bus lines should not connect

through a bus multiplexer powered from a voltage rail

controlled by the MAX16068. If the device needs to be

controlled by an on-board FP, consider connecting the

F

P to one bus (such as SMBus) and use the other bus

for in-circuit programming.

Maintaining Power During

a Fault Condition

Power to the MAX16068 must be maintained for a spe-

cific period of time to ensure a successful flash fault

log operation during a fault that removes power to the

circuit. Table 25 shows that the amount of time required

depends on the settings in the fault control register

(r6Dh[1:0]).

Maintain power for shutdown during fault conditions in

applications where the always-on power supply cannot

be relied upon by placing a diode and a large capacitor

between the voltage source, VIN, and VCC (Figure 12).

The capacitor value depends on VIN and the time delay

required, tFAULT_SAVE. Use the following formula to cal-

culate the capacitor size:

C = (tFAULT_SAVE x ICC(MAX))/(VIN - VDIODE - VUVLO)

where the capacitance is in Farads and tFAULT_SAVE is in

seconds, ICC(MAX) is 14mA, VDIODE is the voltage drop

across the diode, and VUVLO is 2.7V. For example, with

a VIN of 14V, a diode drop of 0.7V, and a tFAULT_SAVE

of 153ns, the minimum required capacitance is 202FF.

Table 25. RESET State, Flash State, and Reset Reason

Figure 12. Power Circuit for Shutdown During Fault Conditions

REGISTER ADDRESS

BIT RANGE

DESCRIPTION

r20h

[0]

Reset output state

0 = RESET is low

1 = RESET is high

[1]

1 = Flash memory is busy

[2]

1 = Last reset asserted due to EN going low

[3]

1 = Last reset asserted due to watchdog timeout

[7:4]

Not used

MAX16068

VCC

C

VIN

GND

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