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參數(shù)資料
| 型號： | ADM1033ARQ-REEL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | Thermal Monitor and Fan Speed (RPM) Controller |
| 中文描述： | DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 2Cel, RECTANGULAR, SURFACE MOUNT |
| 封裝： | MO-137AB, QSOP-16 |
| 文件頁數(shù)： | 23/40頁 |
| 文件大?。?/td> | 1164K |
| 代理商： | ADM1033ARQ-REEL |
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ADM1033
FAN_FAULT OUTPUT
Rev. 0 | Page 23 of 40
The FAN_FAULT output signals when the fan stalls. Pin 8, a
dual-function pin, defaults to a FAN_FAULT output. It can also
be reconfigured as an analog input reference for the THERM
input. To configure the pin, set the FAN_FAULT/REF bit (Bit 7)
in Configuration Register 4 (Address 0x04) to 1.
FAULT QUEUE
The ADM1033 has a programmable fault queue option that lets
the user program the number of out-of-limit measurements
allowable before generating an SMBusALERT. The fault queue
affects only temperature measurement channels and is opera-
tional only in SMBusALERT mode. It performs some simple
filtering, which is particularly useful at the higher conversion
rates (16, 32, and 64 conversions per second), where averaging is
not carried out.
There is a queue for each of the temperature channels. If L (the
value programmed to the fault queue) or more consecutive out-
of-limit measurements are made on the same temperature
channel, the fault queue fills and the SMBusALERT output
triggers. To fill the fault queue, the user needs L or more
consecutive out-of-limit measurements on the local, or L or
more consecutive out-of-limit measurements on the remote
channel. The fault queue is independent of the state of the bits
in the status register.
Table 22. Fault Queue (Address 0x06)
Bits <3:0>
000x
001x
01xx
1xxx
To reset the fault queue, do one of the following:
SMBus ARA command
Read Status Register 1
Power-on reset
The SMBusALERT clears, even if the condition that caused the
SMBusALERT remains. The SMBusALERT is reasserted, if the
fault queue fills up.
Fault Queue
1
2
3
4
CONVERSION RATE REGISTER
The ADM1033 makes up to 64 measurements per second.
However, for the sake of reduced power consumption and better
noise immunity, users can run the ADM1033 at a slower
conversion rate. Averaging does not occur at rates of 16, 32, and
64 conversions per second. Table 23 lists the available rates. The
conversion rate register is located at Address 0x05. Note that the
current round-robin loop must be completed before the newly
programmed conversion rate can take effect.
Table 23. Conversion Rates
Code
Conversion Rate
0x00
0.0625
0x01
0.125
0x02
0.25
0x03
0.5
0x04
1
0x05
2
0x06
4
0x07
8
0x08
16
0x09
32
0x0A
64
0x0B to 0xFF
Reserved
THERM I/O TIMER AND LIMITS
Pin 7 can be configured as either an input or output. As an
output, it is asserted low to signal that the measured tempera-
ture has exceeded preprogrammed temperature limits. The
output is automatically pulled high again when the temperature
falls below the (THERM Hysteresis) limit. The value of hys-
teresis is programmable in Register 0x1A. THERM is enabled as
an output by default on power-up.
0
TEMPERATURE
LIMITS
TIME
THERM, 85
°
C
THERM-HYST,
THERM
80
°
C
Figure 33. THERM Behavior
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