MAX6876 查看數據表（PDF） - Maxim Integrated

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MAX6876

EEPROM-Programmable, Quad, Power-Supply Tracker/Sequencer Circuit

Maxim Integrated 

EEPROM-Programmable, Quad,

Power-Supply Tracker/Sequencer Circuit

Table 6. IN1–IN4 Threshold Settings (continued)

REGISTER

ADDRESS

05h

06h

07h

08h

EEPROM MEMORY

ADDRESS

25h

26h

27h

28h

BIT

RANGE

[7:0]

[7:0]

[7:0]

[7:4]

DESCRIPTION

IN2 Overvoltage Threshold

VTH = 1.0 + n x 20mV (if R08[6] = 0)

VTH = 0.5 + n x 10mV (if R08[6] = 1)

where n is the register content decimal representation. Note that VTH ranges

must be 1V to 5.5V and 0.5V to 3.05V, respectively.

IN3 Overvoltage Threshold

VTH = 1.0 + n x 20mV (if R08[5] = 0)

VTH = 0.5 + n x 10mV (if R08[5] = 1)

where n is the register content decimal representation. Note that VTH ranges

must be 1V to 5.5V and 0.5V to 3.05V, respectively.

IN4 Overvoltage Threshold

VTH = 1.0 + n x 20mV (if R08[4] = 0)

VTH = 0.5 + n x 10mV (if R08[4] = 1)

where n is the register content decimal representation. Note that VTH ranges

must be 1V to 5.5V and 0.5V to 3.05V, respectively.

Bit 7—If 0, 20mV steps in VTH setting for IN1

If 1, 10mV steps in VTH setting for IN1

Bit 6—If 0, 20mV steps in VTH setting for IN2

If 1, 10mV steps in VTH setting for IN2

Bit 5—If 0, 20mV steps in VTH setting for IN3

If 1, 10mV steps in VTH setting for IN3

Bit 4—If 0, 20mV steps in VTH setting for IN4

If 1, 10mV steps in VTH setting for IN4

Manual Reset Input (MR)

The manual reset (MR) input initiates a reset condition.

MR is internally pulled up to ABP through a 100kΩ

resistor. When MR is low, RESET remains low for the

selected reset timeout period after MR transitions from

low to high (see the Reset Output (RESET) section).

Margin Input (MARGIN)

MARGIN allows system-level testing while power sup-

plies exceed the normal ranges. Drive MARGIN low

before varying system voltages below/above the select-

ed threshold without signaling an error. MARGIN makes

it possible to vary the supplies without a need to repro-

gram the IN_ or PG_ thresholds and prevents

tracker/sequencer alerts or faults. Drive MARGIN high

or leave it floating for normal operating mode.

ENABLE

Drive logic ENABLE input high to initiate voltage track-

ing/sequencing during power-up operation. Drive logic

ENABLE low to initiate tracking/sequencing power-down

operation. When ENABLE is not used, connect to ABP.

When the MAX6876 is configured to use the I2C on/off

command, a valid I2C signal must be received before

the device begins the power-up tracking/sequencing

routine. The internal enable logic is an AND function of

the ENABLE logic, the TRKEN logic, and the I2C con-

trol/command logic (Figure 7). When all three AND gate

input variables are true (and the monitored IN/OUT volt-

ages meet their required thresholds), turn-on is allowed.

When any AND input variable becomes false, the turn-

off cycle (track/sequence down) begins immediately.

Drive ENABLE and TRKEN high if only the I2C com-

mand is to be used to turn on/off the device. The detec-

tors monitoring IN_ and OUT_ voltages, and

overcurrent conditions have a higher priority after a

power-on routine has been initiated by the internal

enable logic. If a fault occurs during the power-up

cycle, the device is powered down immediately, inde-

pendent of ENABLE, TRKEN, and the I2C shutdown

20 ______________________________________________________________________________________

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