MAX6875 データシートの表示（PDF） - Maxim Integrated

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MAX6875

EEPROM-Programmable, Hex/Quad, Power-Supply Sequencers/Supervisors

Maxim Integrated 

EEPROM-Programmable, Hex/Quad,

Power-Supply Sequencers/Supervisors

Table 15. Programmable Output Active States

REGISTER

ADDRESS

EEPROM

MEMORY

ADDRESS

3Ah

803Ah

BIT

RANGE

[0]

[1]

[2]

[3]

[4]

[5]

[6]

[7]

DESCRIPTION

PO1 (MAX6874 only). 0 = active low, 1 = active high.

PO2 (MAX6874 only). 0 = active low, 1 = active high.

PO3 (MAX6874)/PO1 (MAX6875). 0 = active low, 1 = active high.

PO4 (MAX6874)/PO2 (MAX6875). 0 = active low, 1 = active high.

PO5 (MAX6874)/PO3 (MAX6875). 0 = active low, 1 = active high.

PO6 (MAX6874)/PO4 (MAX6875). 0 = active low, 1 = active high.

PO7 (MAX6874)/PO5 (MAX6875). 0 = active low, 1 = active high.

PO8 (MAX6874 only). 0 = active low, 1 = active high.

Table 16. PO_ Timeout Periods

REGISTER

ADDRESS

11h

15h

1Ch

23h

2Ah

31h

35h

39h

EEPROM

MEMORY

ADDRESS

8011h

8015h

801Ch

8023h

802Ah

8031h

8035h

8039h

BIT RANGE

[3:1]

[3:1]

[4:2]

[4:2]

[3:1]

[3:1]

[3:1]

[3:1]

AFFECTED OUTPUTS

MAX6874

PO1

PO2

PO3

PO4

PO5

PO6

PO7

PO8

MAX6875

—

—

PO1

PO2

PO3

PO4

PO5

—

DESCRIPTION

000 = 25µs

001 = 1.5625ms

010 = 6.25ms

011 = 25ms

100 = 50ms

101 = 200ms

110 = 400ms

111 = 1600ms

ured by the user). To configure the MAX6874/ MAX6875,

first apply an input voltage to IN1 or one of IN3–IN5

(MAX6874)/IN3–IN4 (MAX6875) (see the Powering the

MAX6874/MAX6875 section). VIN1 > +4V or one of

VIN3–VIN5 > +2.7V, to ensure device operation. Next,

transmit data through the serial interface. Use the block

write protocol to quickly configure the device. Write to

the configuration registers first to ensure the device is

configured properly. After completing the setup proce-

dure, use the read word protocol to verify the data from

the configuration registers. Lastly, use the write word

protocol to write this data to the EEPROM registers. After

completing EEPROM register configuration, apply full

power to the system to begin normal operation. The non-

volatile EEPROM stores the latest configuration upon

removal of power. Write 0’s to all EEPROM registers to

clear the memory.

Software Reboot

A software reboot allows the user to restore the

EEPROM configuration to the volatile registers without

cycling the power supplies. Use the send byte com-

mand with data byte 88h to initiate a software reboot.

The 3.5ms (max) power-up delay also applies after a

software reboot.

SMBus/I2C-Compatible Serial Interface

The MAX6874/MAX6875 feature an I2C/SMBus-compati-

ble serial interface consisting of a serial data line (SDA)

and a serial clock line (SCL). SDA and SCL allow bidirec-

tional communication between the MAX6874/MAX6875

and the master device at clock rates up to 400kHz.

Figure 2 shows the interface timing diagram. The

MAX6874/MAX6875 are transmit/receive slave-only

devices, relying upon a master device to generate a

clock signal. The master device (typically a microcon-

troller) initiates data transfer on the bus and generates

SCL to permit that transfer.

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