MAX6651EEE datasheet(6/25 Pages) MAXIM

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Fan-Speed Regulators and Monitors

with SMBus/I2C-Compatible Interface

Maxim Integrated

MAX6650/MAX6651

The MAX6650/MAX6651 employ three standard SMBus

protocols: write byte, read byte, and receive byte

(Figure 2). The shorter protocol (receive) allows quicker

transfers, provided that the correct data register was

previously selected by a write or read byte instruction.

Use caution with the shorter protocol in multimaster

systems, since a second master could overwrite the

command byte without informing the first master.

Slave Addresses

The device address can be set to one of four different

values. Accomplish this by pin-strapping ADD so that

more than one MAX6650/MAX6651 can reside on the

same bus without address conflicts (Table 1).

SMBus/I2C

INTERFACE

SMBus/I2C

INTERFACE

VCC

3V TO 5.5V

VCC

SCL

SDA

ADD

GND

FAN SPEED

CONFIGURE

ALARM ENABLE

ALARM STATUS

TACH COUNT

COUNT TIME

GPIO DEF

GPIO STATUS

DAC

ADDRESS

DECODE

TACHOMETER

COUNT

CONTROL

LOGIC

8-BIT

DAC

10k

VREF

GPIO

BLOCKS

(FIGURE 5)

GPIO0

OUT

TACH0

GPIO1

10k

90k

10k

MAX6650

MAX6651

ALERT

FULL ON

FAN

VFAN = 5V OR 12V

VOFFSET

Figure 1. Block Diagram

Table 1. Slave Address Decoding (ADD)

BINARY

VCC

1001 011

No connection (high-Z)

0011 011

10k

Ω resistor to GND

0011 111

ADDRESS

ADD

1001 000

GND

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