MAX16067 datasheet(41/47 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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______________________________________________________________________________________ 41

6-Channel, Flash-Configurable System Manager

with Nonvolatile Fault Registers

SETFLSHADD: This is an extension to the standard

IEEE 1149.1 instruction set that allows access to the

flash page. Flash registers include ADC conversion

results, DACOUT enables, and GPIO input/output data.

Use this page to access registers 200h-2FFh.

RSTFLSHADD: This is an extension to the standard

IEEE 1149.1 instruction set. Use RSTFLSHADD to return

to the default page and disable access to the flash page.

SETUSRFLSH: This is an extension to the standard

IEEE 1149.1 instruction set that allows access to the user

flash page. When on the configuration flash page, send

the SETUSRFLSH command, all addresses are recog-

nized as flash addresses only. Use this page to access

registers 300h–3FFh.

RSTUSRFLSH: This is an extension to the standard

IEEE 1149.1 instruction set. Use RSTUSRFLSH to return

to the configuration flash page and disable access to

the user flash.

Restrictions When Writing to Flash

Flash must be written to 8 bytes at a time. The initial

address must be aligned to 8-byte boundaries—the

3 LSBs of the initial address must be ‘000’. Write the

8 bytes using 8 successive Write Data commands. A

write operation requires 122ms for each 8-byte block.

After programming a block, check r20h[1] (see Table

31) to make sure the write operation is complete before

attempting to write the next block.

Applications Information

Unprogrammed Device Behavior

When the flash has not been programmed using the

JTAG or SMBus interface, the default configuration of

the EN_OUT_ outputs is open drain active low. This

means that the EN_OUT_ outputs are high impedance.

When it is necessary to hold an EN_OUT_ high or low to

prevent premature startup of a power supply before the

flash is programmed, connect a resistor from EN_OUT_

to ground or the supply voltage. Avoid connecting a

resistor to ground when the output is to be configured as

open drain with a separate pullup resistor.

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 MAX16067 in Circuit

The MAX16067 can be programmed in the application

circuit by taking into account the following points during

circuit design:

U

The MAX16067 needs to be powered from an inter-

mediate voltage bus or 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 MAX16067. 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.

U

An unprogrammed MAX16067’s EN_OUT_s go high

impedance. Ensure that this does not cause undesired

circuit behavior. If necessary, connect pulldown resis-

tors to prevent power supplies from turning on.

Table 31. RESET State, Flash State, and Reset Reason

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

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