ADM1029(2012) Просмотр технического описания (PDF) - ON Semiconductor

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ADM1029
(Rev.:2012)

Dual PWM Fan Controller and Temperature Monitor for High Availability Systems

ON Semiconductor 

ADM1029

expects to see a fan interfaced to it. It does not necessarily

mean that the fan is actually, physically, connected.

If a fan is installed, events such as a fault output and

hot-swapping of the fan can cause INT and CFAULT to be

asserted, unless they are masked for that particular event. If

a fan is not installed, but is still physically connected to the

ADM1029, these events will be ignored with respect to

asserting INT or CFAULT, but will still be reflected in the

corresponding Fan Status Register.

Setting Bit 0 indicates that Fan 1 is installed and is set to

1 at power-up by default. Setting Bit 1 indicates that Fan 2

is installed and depends on the state of Pin 18

(TMIN/INSTALL) at power-up.

DEFAULTS

LOCAL = 605C

REMOTE 1 = 705C

REMOTE 2 = 705C

CONFIGURE

TEMPERATURE LOW

LIMITS

LOCAL (REG 0X98)

REMOTE 1 (REG 0X99)

REMOTE 2 (REG 0X9A)

DEFAULTS

LOCAL = 805C

REMOTE 1 = 1005C

REMOTE 2 = 1005C

CONFIGURE

TEMPERATURE HIGH

LIMITS

LOCAL (REG 0X90)

REMOTE 1 (REG 0X91)

REMOTE 2 (REG 0X92)

CONFIGURE

TEMPERATURE FAULT

ACTION

LOCAL (REG 0X40)

REMOTE 1 (REG 0X41)

REMOTE 2 (REG 0X42)

CONFIGURE

TEMPERATURE COOLING

ACTION

LOCAL (REG 0X48)

REMOTE 1 (REG 0X49)

REMOTE 2 (REG 0X4A)

DEFAULTS

LOCAL = 05C

REMOTE 1 = 05C

REMOTE 2 = 05C

CONFIGURE

TEMPERATURE OFFSETS

LOCAL (REG 0X30)

REMOTE 1 (REG 0X31)

REMOTE 2 (REG 0X32)

MEASURE

TEMPERATURE

LOCAL (REG 0XA0)

REMOTE 1 (REG 0XA1)

REMOTE 2 (REG 0XA2)

BIT 0 = 1

BIT 1 = 1

BIT 2 = 1

BIT 3 = 0

BIT 3 = 1

BIT 4 = 1

BIT 5 = 1

BIT 6 = 1

BIT 7

ASSERT CFAULT ON OVER-TEMPERATURE

RUN FAN(S) ALARM SPEED ON OVER-TEMPERATURE

ASSERT INT ON OVER-TEMPERATURE

ALARM BELOW LOW TEMP LIMIT

ALARM ABOVE LOW TEMP LIMIT

ASSERT CFAULT WHEN LOW TEMP LIMIT CROSSED

RUN FAN ALARM SPEED ON UNDER-TEMPERATURE

ASSERT INT ON UNDER-TEMPERATURE

LATCHES A TEMPERATURE OUT-OF-LIMIT EVENT

7

6

5

4

3

2

1

0

IS

TEMPERATURE

>

HIGH LIMIT?

IS

TEMPERATURE

>

HIGH LIMIT?

YES

CFAULT

IS

TEMPERATURE

>

HIGH LIMIT?

YES

FANS RUN

ALARM SPEED

ALARM ABOVE

OR BELOW LOW

TEMP LIMIT?

YES

INT

0 = ALARM BELOW TEMP LIMIT

LOW TEMP LIMT

CROSSED?

YES

1 = ALARM ABOVE TEMP LIMIT

CFAULT

LOW TEMP LIMT

CROSSED?

YES

LOW TEMP LIMT

CROSSED?

FANS RUN ALARM SPEED

YES

INT

BIT 0 = 1

BIT 1 = 1

X

AUTOMATIC FAN SPEED CONTROL (SEE TABLE 15 LATER)

FAN 1 RUNS AT ALARM SPEED FOR OUT-OF-LIMIT TEMPERATURE EVENTS;

OTHERWISE, FAN 1 RUNS AT SPEED DETERMINED BY AUTOMATIC FAN CONTROL

FAN 2 RUNS AT ALARM SPEED FOR OUT-OF-LIMIT TEMPERATURE EVENTS;

OTHERWISE, FAN 2 RUNS AT SPEED DETERMINED BY AUTOMATIC FAN CONTROL

X

X

X

X

X

1

0

Figure 23. Temperature Sensing Flowchart

http://onsemi.com

13

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