ADM1034 datasheet(21/40 Pages) AD

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ADM1034

Rev. 0 | Page 21 of 40

Table 16. Interrupt Status Register 1 (Reg. 0x4F)

Bit No.

Name

Description

1 = Local high temperature limit has been

exceeded.

1 = Local low temperature limit has been

exceeded.

R1H

1 = Remote 1 high temperature limit has

been exceeded.

R1L

1 = Remote 1 low temperature limit has

been exceeded.

R1D

1 = Remote 1 diode error; indicates an open

or short on the D1+/D1− pins.

R2H

1 = Remote 2 high temperature limit has

been exceeded.

R2L

1 = Remote 2 low temperature limit has

been exceeded.

R2D

1 = Remote 2 diode error; indicates an open

or short on the D2+/D2− pins.

Table 17. Status Register 2 (Reg. 0x50)

Bit No.

Name

Description

1 = Local THERM temperature limit has

been exceeded.

R1T

1 = Remote 1 THERM temperature limit has

been exceeded.

R2T

1 = Remote 2 THERM temperature limit has

been exceeded.

1 = THERM % ontime limit has been

exceeded.

1 = One of the THERM limits has been

exceeded; and the THERM output signal

has been asserted.

1 = THERM state. Indicates the THERM pin is

active; clears on a read if THERM is not

active. Does not generate an ALERT in

ALERT comp mode.

Res

Reserved.

Res

Reserved.

Table 18. Status Register 3 (Reg. 0x51)

Bit No.

Name

Description

F1S

1 = Fan 1 has stalled.

1 = Fan alarm speed. Fan1 and Fan 2 are

running at alarm speed.

F2S

1 = Fan 2 has stalled.

Res

Reserved.

Res

Reserved.

Res

Reserved.

Res

Reserved.

ALERT

1 = ALERT low; indicates the ALERT line has

been pulled low.

ALERT INTERRUPT BEHAVIOR

The ADM1034 generates an ALERT whenever an out-of-limit

measurement is made (if it is not masked out). The user can

also detect out-of-limit conditions by polling the ADM1034

status registers. It is important to note how the SMBus ALERT

output behaves when writing interrupt handler software.

The ALERT output on the ADM1034 can be programmed to

operate in either SMBusALERT mode or in comp mode.

In SMBusALERT mode, the ALERT output remains low until

the measurement falls back within its programmed limits and

either the status register is read or an ARA is completed. In

comp mode, the ALERT output automatically resets once the

temperature measurement falls back within the programmed

limits.

Configuring the ALERT Output

For SMBusALERT mode, set the ALERT configuration bit

(Bit 3) of the Configuration Register 1 (Address 0x01) to 0.

In SMBusALERT mode, a status bit is set when a measurement

goes outside of its programmed limit. If the corresponding

mask bit is not set, the ALERT output is pulled low. If the

measured value falls back within the limits, the ALERT output

remains low until the corresponding status register is read or

until an ARA is completed (as long as no other measurement is

outside its limits).

For comp mode, set the ALERT configuration bit (Bit 3) of

Configuration Register 1 (Address 0x01) to1.

In comp mode, the ALERT output is automatically pulled low

when a measurement goes outside its programmed limits. Once

the measurement falls back within its limits (and assuming no

other measurement channel is outside its limits), the ALERT

output is automatically pulled high again.

The main difference between the two modes is that the

SMBusALERT does not reset without software intervention,

whereas the comp mode ALERT output automatically resets.

ALERT, 70

°C

TEMPERATURE

LIMITS

TIME

CLEARED

ON READ

ALERT COMP

SMBusALERT

Figure 31. ALERT Comparator and SMBusALERT Outputs

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