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参数资料
| 型号： | ADM1034ARQZ-REEL |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO16 |
| 封装： | LEAD FREE, MO-137AB, QSOP-16 |
| 文件页数： | 22/40页 |
| 文件大小： | 1318K |
| 代理商： | ADM1034ARQZ-REEL |
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ADM1034
Rev. 0 | Page 29 of 40
Once the temperature exceeds the highest temperature point in
the look-up table, the fan speed remains at the highest speed
until the temperature drops below the T7 temperature value.
When the look-up table is split in two, the same applies.
If the temperatures in T1 to T8 are not programmed in
succession, the fan speed moves to the next highest pro-
grammed temperature as the temperature increases. Similarly,
when the temperature decreases, it ignores programmed higher
temperatures and jumps to the next lower temperature. There-
fore, the temperature-to-fan-speed profile for increasing and
decreasing temperature can be different.
When programming the look-up table, the user has the option
to use between two and eight points for each fan (eight points
only if the same curve is to be used for both fans). If the user
just wants to program a transfer curve (and knows the starting
temperature, minimum speed, maximum temperature, and
maximum speed), then all the user needs to program are four
parameters—T1, T2, FS1, and FS2. The remainder of the look-
up temperature thresholds should remain at their default values
of +191°C. If required, the FS3 should be programmed with the
same value as FS2 to give the flat curve, if required. Or, the fan
speeds can be left at the default value of 0. However, it is normal
to program a THERM limit as well. Once this temperature is
exceeded and the boost bit is set, the fans run to full speed. This
overrides the look-up table.
FAN SPEED
T1
T2
T (3 TO 8) =
°C
TEMPERATURE
TACH COUNT 2 TO 8
TACH COUNT 1
04918-0-041
Figure 43. Programming Two Points on the Look-Up Table
Table 29. Look-Up Table Register Addresses
x
Temperature, x
FSx, LSB
FSx, MSB
1
0x22
0x2A
0x2B
2
0x23
0x2C
0x2D
3
0x24
0x2E
0x2F
4
0x25
0x30
0x31
5
0x26
0x32
0x33
6
0x27
0x34
0x35
7
0x28
0x36
0x37
8
0x29
0x38
0x39
SETTING UP THE SIZE OF THE LOOK-UP TABLE
When 4:8 Look-Up (Bit 3)is set to 0 (default), four points are
used for each fan.
When 4:8 Look-Up (Bit 3) is set to 1, all eight points on the
table are used for both fans.
SETTING UP THE LOOK-UP TABLE IN
LINEAR MODE
When Discrete/Linear Speed (Bit 2) is set to 1 (default), the
TACH count decreases linearly (and therefore the fan speed
increases) with temperature.
Example: At temperature TX, the fans run at FSX and fan speed
increases with temperature to FSX+1 at temperature TX+1.
Alternatively, the fan can be run at discrete fan speeds. When
Discrete/Linear Speed (Bit 2) is set to 0, the fan runs at a new
speed once the temperature threshold is exceeded.
SETTING WHICH TEMPERATURE
CHANNEL CONTROLS A FAN
Fan Behavior Register (Address 0x07)
Bits <1:0> = DRIVE1 Behavior (D1B)
Bits <3:2> = DRIVE2 Behavior (D2B)
The ADM1034 can be configured so that Fan 1 or Fan 2 can be
controlled by either the local temperature, or by the Remote 1
or Remote 2 temperatures.
Table 30. Drive X BHVR Bits
Bits
DRIVE x BHVR
00
Local Temperature Controls Fan x
01
Remote 1 Temperature Controls Fan x
10
Remote 2 Temperature Controls Fan x
11
Fan x Runs at Full Speed
By default, Remote 1 controls Fan 1, and Remote 2 controls
Fan 2. If the ADM1034 is in single-channel mode and one of the
fans is set up to run from a temperature channel that is not being
measured, the drive X BHVR bits are set to 11 and the fan is run
at full speed.
LOOK-UP TABLE HYSTERESIS
The user can program a hysteresis to be applied to the look-up
table. The advantage of this is apparent if the temperature is
cycling around one of the threshold temperatures and causing
the fan speed to switch between the two speeds, particularly
when the look-up table is configured in discrete mode. It would
not be as important in the linear mode.
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| ADM1034ARQZ-REEL7 | 功能描述:IC THERM/FAN SPEED CTRLR 16-QSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热管理 系列:- 标准包装:1 系列:- 功能:温度监控系统（传感器） 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:±2.5°C 本地（最大值），±5°C 远程（最大值） 拓扑:ADC，比较器，寄存器库 输出类型:2 线 SMBus? 输出警报:无 输出风扇:无 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SOT-23-8 供应商设备封装:SOT-23-8 包装:Digi-Reel® 其它名称:296-22675-6 |
| ADM1040 | 制造商:AD 制造商全称:Analog Devices 功能描述:Power Supply Monitor ASIC |
| ADM1041 | 制造商:AD 制造商全称:Analog Devices 功能描述:Secondary-Side Controller with Current Share and Housekeeping |
| ADM1041A | 制造商:AD 制造商全称:Analog Devices 功能描述:Secondary-Side Controller with Current Share and Housekeeping |
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