MAX6661AEE+T【PDF 12/19 页】IC REG FAN SPEED 16-QSOP

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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 and the

corresponding status bit are reasserted at the end of

the next conversion.

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

Remote Temperature-Controlled Fan-Speed

Regulator with SPI-Compatible Interface

12 ______________________________________________________________________________________

BIT

NAME

POR STATE

DESCRIPTION

7(MSB)

ALERT Mask

When set to 1, ALERT is masked from internally generated errors.

Run/Stop

When set to 1, the MAX6661 enters low-power standby.

OVERT Polarity

0 provides active low, 1 provides active high.

Write Protect

When set to 1, Write Protect is in effect for the following applicable registers:

1. Configuration register bits 6, 5, 4, 3

2. T

MAX

3. T

HYST

4. Fan conversion rate register

Thermal Closed/

Open Loop

When set to 1, the thermal loop is open. The fan speed control retains the

last closed-loop value unless overwritten by a bus command (in closed

loop, the fan speed control is read only). If fan mode is set to open loop by

writing a 1 to bit 0 of the fan gain register, then this bit is automatically set.

OVERT Input Inhibit

When set to 1, an external signal on OVERT is masked from bit 1 of the

status register.

Mask OVERT

Output

Mask the OVERT output from an internally generated overtemperature error.

N/A

Not used.

Table 4. Configuration Register Bit Assignments

BIT

NAME

POR STATE

DESCRIPTION

7(MSB)

MAX6661

Overheat

When high, indicates that the fan driver transistor of the MAX6661 has

overheated (temperature > +150癈) and is in thermal shutdown. The fan driver

remains disabled until temperature falls below +140癈.

ALERT

When high, indicates ALERT has been activated (pulled low), regardless of

cause (internal or external).

Fan Driver Full

Scale

When high, indicates the fan driver is at full scale. Only valid in fan

closed-loop mode.

Remote High

When high, the remote-junction temperature exceeds the temperature in the

remote high register.

Remote Low

When low, the remote-junction temperature is lower than the temperature in the

remote low register.

Diode Open

When high, the remote-junction diode is open.

OVERT

When active, indicates that OVERT has been activated, regardless of cause

(internal or external).

Fan Failure

When high, indicates the count in the fan tachometer period register is higher

than the limit set in the fan tachometer period limit register.

Table 5. Status Register Bit Assignments

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