MAX6660EVKIT【PDF 11/21 页】EVAL KIT FOR MAX6660

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Remote-Junction Temperature-Controlled

Fan-Speed Regulator with SMBus Interface

master. Upon receiving an ALERT interrupt signal, the

host master can broadcast a Receive Byte transmission

to the Alert Response slave address (see Slave

Addresses section). Then, any slave device that gener-

ated an interrupt attempts to identify itself by putting its

own address on the bus (Table 3).

The Alert Response can activate several different slave

devices simultaneously, similar to the I 2 C General Call.

If more than one slave attempts to respond, bus arbitra-

tion rules apply, and the device with the lower address

code wins. The losing device does not generate an

Acknowledge and continues to hold the ALERT line low

until cleared. (The conditions for clearing an alert vary

depending on the type of slave device.) Successful

completion of the Alert Response protocol clears the

interrupt latch, provided the condition that caused the

alert no longer exists. If the condition still exists, the

device reasserts the ALERT interrupt at the end of the

next conversion.

Table 3. Read Format for Alert Response

Address

Configuration Byte Functions

The Configuration Byte register (Table 5) is used to

mask (disable) the ALERT signal to place the device in

software standby mode, to change the polarity of

OVERT , to set MAX6660 to thermal open/closed-loop

mode, to inhibit the OVERT signal, to mask OVERT out-

put, and to clear the ALERT signal. The MAX6660 has a

write protection feature (bit 4) that prohibits write com-

mands to bits 6–3 of the Configuration register. It also

prohibits writes to the T MAX , T HYST , and Fan

Conversion Rate registers.

Status Byte Functions

The status byte (Table 6) reports several fault condi-

tions. It indicates when the fan driver transistor of the

MAX6660 has overheated and/or is thermal shutdown,

when the temperature thresholds, T LOW and T HIGH ,

have been exceeded, and whether there is an open cir-

cuit in the DXP-DXN path. The register also reports the

state of the ALERT and OVERT lines and indicates

when the fan driver is fully on. The final bit in the Status

register indicates when a fan failure has occurred.

After POR, the normal state of the flag bits is zero,

BIT

7 (MSB)

6

5

4

3

2

1

0 (LSB)

NAME

ADD7

ADD6

ADD5

ADD4

ADD3

ADD2

ADD1

1

FUNCTION

Provide the current MAX6660

slave address

Logic 1

assuming no alert or overtemperature conditions are

present. Bits 2 through 6 of the Status register are

cleared by any successful read of the Status register,

unless the fault persists. The ALERT output follows the

status flag bit. Both are cleared when successfully

read, but if the condition still exists, the ALERT is

reasserted at the end of the next conversion.

The MAX6660 incorporates collision avoidance so that

completely asynchronous operation is allowed between

SMBus operations and temperature conversions.

Command Byte Functions

The 8-bit Command Byte register (Table 4) is the mas-

ter index that points to the other registers within the

MAX6660. The register’s POR is 0000 0000, so that a

receive byte transmission (a protocol that lacks the

command byte) that occurs immediately after POR

returns the current remote temperature data.

One-Shot

The one-shot command immediately forces a new conver-

sion cycle to begin. In software standby mode

(RUN/STOP bit = high), a new conversion is begun, after

which the device returns to standby mode. If a conversion

is in progress when a one-shot command is received, the

command is ignored. If a one-shot command is between

conversions, in autoconvert mode (RUN/STOP bit = low),

a new conversion begins immediately.

When autoconverting, if the T HIGH and T LOW limits are

close together, it is possible for both high-temperature

and low-temperature status bits to be set, depending

on the amount of time between status read operations.

In these circumstances, it is best not to rely on the sta-

tus bits to indicate reversals in long-term temperature

changes. Instead, use a current temperature reading to

establish the trend direction.

Manufacturer and Device ID Codes

Two ROM registers provide manufacturer and device

ID codes. Reading the manufacturer ID returns 4D,

which is the ASCII code M (for Maxim). Reading the

device ID returns 09h, indicating the MAX6660 device.

If READ WORD 16-bit SMBus protocol is employed

(rather than the 8-bit READ BYTE), the LSB contains the

data and the MSB contains 00h in both cases.

______________________________________________________________________________________

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