MAX6616AEG+T【PDF 6/20 页】IC TEMP MON FAN CNTRL 24QSOP

收藏本站

您好，
买卖IC网欢迎您。
请登录
免费注册

买卖IC网

Sheet目录43

2页 3页 4页 5页 [6页]7页 8页 9页 10页

Detailed Description

The MAX6615/MAX6616 accurately monitor two tem-

perature channels, either the internal die temperature

and the temperature of an external thermistor, or the

temperatures of two external thermistors. They report

temperature values in digital form using a 2-wire

SMBus/I

C-compatible serial interface. The MAX6615/

MAX6616 operate from a supply voltage range of 3.0V

to 5.5V and consume 500礎 (typ) of supply current.

The temperature data controls the duty cycles of two

PWM output signals that are used to adjust the speed

of a cooling fan. They also feature an overtemperature

alarm output to generate interrupts, throttle signals, or

shutdown signals.

The MAX6616 also includes six GPIO input/outputs to

provide additional flexibility. The GPIO0 power-up state

is set by connecting the GPIO PRESET input to ground

or V

SMBus Digital Interface

From a software perspective, the MAX6615/MAX6616

appear as a set of byte-wide registers. Their devices use

a standard SMBus 2-wire/I

C-compatible serial interface

to access the internal registers. The MAX6615/MAX6616

have nine different slave addresses available; therefore, a

maximum of nine MAX6615/MAX6616 devices can share

the same bus.

The MAX6615/MAX6616 employ four standard SMBus

protocols: write byte, read byte, send byte, and receive

byte (Figures 1, 2, and 3). The shorter receive byte proto-

col allows quicker transfers, provided that the correct

data register was previously selected by a read byte

instruction. Use caution with the shorter protocols in mul-

timaster systems, since a second master could overwrite

the command byte without informing the first master.

Temperature data can be read from registers 00h and

01h. The temperature data format for these registers is

8 bits, with the LSB representing 1癈 (Table 1) and the

MSB representing 128癈. The MSB is transmitted first.

All values below 0癈 clip to 00h.

Table 3 details the register address and function, whether

they can be read or written to, and the power-on reset

Dual-Channel Temperature Monitors and

Fan-Speed Controllers with Thermistor Inputs

6 _______________________________________________________________________________________

WRITE BYTE FORMAT

READ BYTE FORMAT

SEND BYTE FORMAT

RECEIVE BYTE FORMAT

SLAVE ADDRESS: EQUIVA-

LENT TO CHIP-SELECT LINE

OF A 3-WIRE INTERFACE

COMMAND BYTE: SELECTS

WHICH REGISTER YOU ARE

WRITING TO

DATA BYTE: DATA GOES INTO THE REG-

ISTER SET BY THE COMMAND BYTE (TO

SET THRESHOLDS, CONFIGURATION

MASKS, AND SAMPLING RATE)

SLAVE ADDRESS:

EQUIVALENT TO CHIP-

SELECT LINE

COMMAND BYTE:

SELECTS WHICH

READING FROM

SLAVE ADDRESS: REPEAT-

ED DUE TO CHANGE IN

DATA- FLOW DIRECTION

DATA BYTE: READS

FROM THE REGISTER

SET BY THE COMMAND

BYTE

COMMAND BYTE: SENDS COM-

MAND WITH NO DATA, USUALLY

USED FOR ONE-SHOT COMMAND

DATA BYTE: READS DATA FROM

THE REGISTER COMMANDED BY

THE LAST READ BYTE OR WRITE

BYTE TRANSMISSION; ALSO

USED FOR SMBUS ALERT

RESPONSE RETURN ADDRESS

S = START CONDITION

SHADED = SLAVE TRANSMISSION

P = STOP CONDITION

/// = NOT ACKNOWLEDGED

Figure 1. SMBus Protocols

ADDRESS

ACK

DATA

///

7 BITS

8 BITS

ACK

COMMAND

ACK

8 BITS

ADDRESS

7 BITS

ACK

DATA

8 BITS

ACK

COMMAND

8 BITS

ACK

ADDRESS

7 BITS

ADDRESS

ACK

COMMAND

ACK

ADDRESS

7 BITS

8 BITS

7 BITS

ACK

DATA

8 BITS

///

发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

*型号	*数量	厂商	批号	封装

添加更多采购

采购需求

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

我的联系方式