MAX16067 datasheet(42/47 Pages) MAXIM

Part #	MAX16067

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

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Manufacturer	MAXIM [Maxim Integrated Products]

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42 _____________________________________________________________________________________

6-Channel, Flash-Configurable System Manager

with Nonvolatile Fault Registers

Table 32. Maximum Write Time

Figure 15. Power Circuit for Shutdown During Fault Conditions

Figure 16. Connection for a p-Channel Series-Pass MOSFET

Maintaining Power During

a Fault Condition

Power to the MAX16067 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 32 shows 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 15).

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 153ms, the minimum required capacitance is 202FF.

Driving High-Side MOSFET Switches

Up to three of the programmable outputs (EN_OUT1,

EN_OUT2, EN_OUT3) of the MAX16067 can be con-

figured as charge-pump outputs to drive the gates

of series-pass n-channel MOSFETS. When driving

MOSFETs, these outputs act as simple power switches

to turn on the voltage supply rails. Approximate the slew

rate, SR, using the following formula:

SR = ICP/(CGATE + CEXT)

where ICP is the 6FA (typ) charge-pump source cur-

rent, CGATE is the gate capacitance of the MOSFET,

and CEXT is the capacitance connected from the gate

to ground. If more than three series-pass MOSFETs

are required for an application, additional series-pass

p-channel MOSFETs can be connected to outputs con-

figured as active-low open drain (Figure 16). Connect

a pullup resistor from the gate to the source of the

MOSFET, and ensure the absolute maximum ratings of

the MAX16067 are not exceeded.

Configuring the Device

An evaluation kit and a graphical user interface (GUI) are

available to create a custom configuration for the device.

Refer to the MAX16067 Evaluation Kit for configuration.

Cascading Multiple MAX16067s

Multiple MAX16067s can be cascaded to increase the

number of rails controlled for sequencing and moni-

toring. There are many ways to cascade the devices

depending on the desired behavior. In general, there are

several techniques as follows:

U

Configure a GPIO on each device to be EXTFAULT

(open-drain). Externally wire them together with a single

pullup resistor. Set register bits r72h[5] and r6Dh[2] to ‘1’

r6Dh[1:0] VALUE

DESCRIPTION

MAXIMUM WRITE TIME (ms)

00

Save flags and ADC readings

153

01

Save flags

102

10

Save ADC readings

153

11

Do not save anything

—

MAX16067

VCC

C

VIN

GND

MAX16067

VOUT

R

MON_

EN_OUT_

VIN

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