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| 型号： | ADM1033ARQ-REEL |
| 厂商： | ON Semiconductor |
| 文件页数： | 13/35页 |
| 文件大小： | 424K |
| 描述： | IC THERM/FAN SPEED CTRLR 16-QSOP |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi Product Discontinuation Notice 25/Aug/2008 |
| 标准包装： | 2,500 |
| 功能： | 风扇控制，温度监控器 |
| 传感器类型： | 内部和外部 |
| 感应温度： | -40°C ~ 125°C，外部传感器 |
| 精确度： | ±1°C |
| 拓扑： | ADC，比较器，多路复用器，寄存器库 |
| 输出类型： | SMBus? |
| 输出警报： | 是 |
| 输出风扇： | 是 |
| 电源电压： | 3 V ~ 3.6 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 带卷 (TR) |
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ADM1033
http://onsemi.com
13
If a devices ALERT
line goes low, the following occurs:
1. SMBusALERT
is pulled low.
2. The master initiates a receive byte operation and
sends the alert response address (ARA 0001 100).
This is a general call address that must not be used
as a specific address.
3. The device with the low ALERT
output responds
to the ARA, and the master reads its device
address. Once the address is known, it can be
interrogated in the usual way.
4. If low ALERT
output is detected in more than one
device, the one with the lowest device address has
priority, in accordance with normal SMBus
arbitration.
5. Once the ADM1033 has responded to the ARA, it
resets its ALERT
output. However, if the error
persists, the ALERT
is re-asserted on the next
monitoring cycle.
Temperature Measurement System
Internal Temperature Measurement
The ADM1033 contains an on-chip band gap temperature
sensor. The on-chip ADC performs conversions on the
sensors output, outputting the data in 13-bit format. The
resolution of the local temperature sensor is 0.03125癈.
Table 8 shows the format of the temperature data MSBs.
Table 9 shows the same for the LSBs. To ensure accurate
readings, read the LSBs first. This locks the current LSBs
and MSBs until the MSBs are read. They then start to update
again. (Reading only the MSBs does not lock the registers.)
Temperature updates to the look-up table take place in
parallel; so fan speeds may be updated even if the MSBs are
locked.
Table 8. TEMPERATURE DATA FORMAT
(LOCAL TEMPERATURE AND REMOTE
TEMPERATURE HIGH BYTES)
Temperature (5C)
Digital Output
64癈
0000 0000
40癈
0001 1000
32癈
0010 0000
2癈
0011 1110
1癈
0011 1111
0癈
0100 0000
1癈
0100 0001
2癈
0100 0010
10癈
0100 1010
20癈
0101 0100
50癈
0111 0010
75癈
1000 1011
100癈
1010 0100
125癈
1011 1101
150癈
1101 0110
191癈
1111 1111
Table 9. LOCAL AND REMOTE SENSOR EXTENDED
RESOLUTION
Extended Resolution (5C)
Temperature Low Bits
0.0000
00000
0.03125
00001
0.0625
00010
0.125
00100
0.250
01000
0.375
01100
0.500
10000
0.625
10100
0.750
11000
0.875
11100
Temperature (癈) = (MSB 64癈) + (LSB x 0.03125)
Example: MSB = 0101 0100 = 84d
LSB = 11100 = 28
Temperature 癈 = (84 64) + (28 x 0.03125) = 20.875
Remote Temperature Measurement
The ADM1033 can measure the temperature of external
diode sensor or diode-connected transistor, which are
connected to Pins 9 and 10. These pins are dedicated
temperature input channels. The series resistance cancellation
(SRC) feature can automatically cancel out the effect of up to
1 kW of resistance in series with the remote thermal diode.
The forward voltage of a diode or diode-connected
transistor, operated at a constant current, exhibits a negative
temperature coefficient of about 2 mV/癈. Unfortunately,
the absolute value of V
BE
varies from device to device, and
individual calibration is required to null this out. Therefore,
the technique is unsuitable for mass production.
Figure 26. Measuring Temperature by Using Discreet
Transistors
ADM1033
ADM1033
D+
D
D+
D
2N3904
2N3906
The ADM1033 operates at three different currents to
measure the change in V
BE
. Figure 27 shows the input signal
conditioning used to measure the output of an external
temperature sensor. It also shows the external sensor as a
substrate transistor, provided for temperature monitoring on
some microprocessors. The external sensor could work
equally well as a discrete transistor.
If a discrete transistor is used, the collector is not grounded,
and should be linked to the base. If a PNP transistor is used,
the base is connected to the D input and the emitter to the D+
input. If an NPN transistor is used, the emitter is connected to
the D input and the base to the D+ input.
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