MAX6660EVKIT【PDF 10/21 页】EVAL KIT FOR MAX6660

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Remote-Junction Temperature-Controlled

Fan-Speed Regulator with SMBus Interface

The SMBus interface includes a Timeout, which resets

the interface any time the data or clock line is held low

for more than 35ms, ensuring that the MAX6660 can

never “lock” the bus.

Remote Temperature Data Register

Two registers, at addresses 00h and 01h, store the

measured temperature data from the remote diode. The

data format for the remote-diode temperature is 10 bit

+ sign, with each bit corresponding to 0.125°C, in two’s

complement format (Table 2). Register 01h contains the

sign bit and the first 7 bits. Bits 7, 6, 5 of Register 00h

are the 3LSBs. If the two registers are not read at the

same time, their contents may be the result of two dif-

ferent temperature measurements leading to erroneous

temperature data. For this reason, a parity bit has been

added to the 00h register. Bit 4 of this is zero if the data

in 00h and 01h are from the same temperature conver-

sion and are 1 if they are not. The remaining bits are

“don’t cares.” When reading temperature data, register

01h must be read first.

Alarm Threshold Registers

The MAX6660 provides four alarm threshold registers

that can be programmed with a two’s complement tem-

perature value with each bit corresponding to 1°C. The

registers are T HIGH , T LOW , T MAX , and T HYST . If the

measured temperature equals or exceeds T HIGH , or is

less than T LOW , an ALERT interrupt is asserted. If the

measured temperature equals or exceeds T MAX , the

OVERT output is asserted (see Over-Temperature

Output ( OVERT) section). If ALERT and OVERT are acti-

vated by the temperature exceeding T MAX , they can

only be deasserted by the temperature dropping below

T HYST . The POR state for T HIGH is +127°C, for T LOW is -

55°C, for T MAX is +100°C, and for T HYST is +95°C.

Over-Temperature Output ( OVERT )

The MAX6660 has an over-temperature output ( OVERT )

that is set when the remote-diode temperature crosses

the limits set in the T MAX register. It is always active if

the remote-diode temperature exceeds T MAX . The

OVERT line clears when the temperature drops below

T HYST . Bit 1 of the Configuration register can be used

to mask the OVERT output. Typically, the OVERT output

is connected to a power-supply shutdown line to turn

system power off. At power-up, OVERT defaults to

active-low but the polarity can be reversed by setting

bit 5 of the Configuration register.

The OVERT line can be taken active, either by the

MAX6660 or driven by an external source. An external

source can be masked by bit 2 of the Configuration

register. When OVERT is active, the fan loop forces the

fan to full speed and bit 1 of the Status register is set.

Diode Fault Alarm

A continuity fault detector at DXP detects an open cir-

cuit between DXP and DXN. If an open or short circuit

exists, register 01h is loaded with 000 0000.

Additionally, if the fault is an open circuit, bit 2 of the

status byte is set to 1 and the ALERT condition is acti-

vated at the end of the conversion. Immediately after

POR, the Status register indicates that no fault is pre-

sent until the end of the first conversion.

ALERT Interrupts

The ALERT interrupt output signal is activated (unless it is

masked by bit 7 in the Configuration register) whenever

the remote-diode’s temperature is below T LOW or exceeds

T HIGH . A disconnected remote diode (for continuity detec-

tion), a shorted diode, or an active OVERT also activates

the ALERT signal. The activation of the ALERT signal sets

the corresponding bits in the Status register. There are two

ways to clear the ALERT : sending the ALERT Response

Address or reading the Status register.

The interrupt does not halt automatic conversions. New

temperature data continues to be available over the

SMBus interface after ALERT is asserted. ALERT is an

active-low open-drain output so that devices can share

a common interrupt line. The interrupt is updated at the

end of each temperature conversion so, after being

cleared, reappears after the next temperature conver-

sion, if the cause of the fault has not been removed.

By setting bit 0 in the Configuration register to 1, the

Status register can only be cleared by sending the

SMBus Alert Response Address (see Alert Response

Address section). Prior to taking corrective action, always

check to ensure that an interrupt is valid by reading the

current temperature. To prevent recurring interrupts, the

MAX6660 asserts ALERT only once per crossing of a

given temperature threshold. To enable a new interrupt,

the value in the limit register that triggered the interrupt

must be rewritten. Other interrupt conditions can be

caused by crossing the opposite temperature threshold,

or a diode fault can still cause an interrupt.

Example: The remote temperature reading crosses

T HIGH , activating ALERT . The host responds to the

interrupt and reads the Alert Response Address, clear-

ing the interrupt. The system may also read the status

byte at this time. If the condition persists, the interrupt

reappears. Finally, the host writes a new value to

T HIGH . This enables the device to generate a new

T HIGH interrupt if the alert condition still exists.

Alert Response Address

The SMBus Alert Response interrupt pointer provides

quick fault identification for simple slave devices that

lack the complex, expensive logic needed to be a bus

10

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