參數(shù)資料
型號： ADM1030ARQZ-RL7
廠商： ON Semiconductor
文件頁數(shù)： 20/30頁
文件大?。?/td> 327K
描述： IC SNSR TEMP/FAN PWM CTRL 16QSOP
產(chǎn)品變化通告： MFG CHG Notification ADI to ON Semi
Product Obsolescence 11/Feb/2009
標(biāo)準(zhǔn)包裝： 1,000
功能： 風(fēng)扇控制，溫度監(jiān)控器
傳感器類型： 內(nèi)部和外部
感應(yīng)溫度： 0°C ~ 100°C，外部傳感器
精確度： ±1°C，±1°C（最小值）
拓?fù)洌?/td> ADC，比較器，多路復(fù)用器，寄存器庫
輸出類型： SMBus?
輸出警報： 是
輸出風(fēng)扇： 是
電源電壓： 3 V ~ 5.5 V
工作溫度： 0°C ~ 100°C
安裝類型： 表面貼裝
封裝/外殼： 16-SSOP（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 16-QSOP
包裝： 帶卷 (TR)
ADM1030
http://onsemi.com
20
Clearing Bit 5 of Configuration Register 1 allows fan
control by varying PWM duty cycle. Values of duty cycle
between 0% to 100% may be written to the Fan Speed
Config Register (0x22) to control the speed of the fan.
Table 14 shows the relationship between hex values written
to the Fan Speed Configuration Register and PWM duty
cycle obtained.
Table 14. PWM DUTY CYCLE SELECT MODE
Hex Value
PWM Duty Cycle
00
0%
01
7%
02
14%
03
20%
04
27%
05
33%
06
40%
07
47%
08
53%
09
60%
0A
67%
0B
73%
0C
80%
0D
87%
0E
93%
0F
100%
RPM Feedback Mode
The second method of fan speed control under software is
RPM Feedback Mode. This involves programming the
desired fan RPM value to the device to set fan speed. The
advantages include a very tightly maintained fan RPM over
the fans life, and virtually no acoustic pollution due to fan
speed variation.
Fans typically have manufacturing tolerances of ?0%,
meaning a wide variation in speed for a typical batch of
identical fan models. If it is required that all fans run at
exactly 5000 RPM, it may be necessary to specify fans with
a nominal fan speed of 6250 RPM. However, many of these
fans will run too fast and make excess noise. A fan with
nominal speed of 6250 RPM could run as fast as 7000 RPM
at 100% PWM duty cycle. RPM Mode will allow all of these
fans to be programmed to run at the desired RPM value.
Clearing Bit 7 of Configuration Register 1 (Reg 0x00)
to 0 places the ADM1030 under software control. Once
under software control, the device may be placed in to RPM
Feedback Mode by writing to Bit 5 of Configuration
Register 1. Writing a 1 to Bit 5 selects RPM Feedback Mode
for the fan. Once RPM Feedback Mode has been selected,
the required fan RPM may be written to the Fan Tach High
Limit Register (0x10). The RPM Feedback Mode function
allows a fan RPM value to be programmed into the device,
and the ADM1030 will maintain the selected RPM value by
monitoring the fan tach and speeding up the fan as necessary,
should the fan start to slow down. Conversely, should the fan
start to speed up due to aging, the RPM feedback will slow
the fan down to maintain the correct RPM speed. The value
to be programmed into each Fan Tach High Limit Register
is given by:
(eq. 7)
Count + (f 60)R N
where:
f = 11.25 kHz
R = desired RPM value
N = Speed Range; MUST be set to 2
The speed range, N, really determines what the slowest
fan speed measured can be before generating an interrupt.
The slowest fan speed will be measured when the count
value reaches 255.
Since speed range, N, = 2,
(eq. 8)
Count + (f 60)R N
R + (f 60)Count N
R + (11250 60)255 2
R + (675000)510
R + 1324 RPM, fan fail detect speed.
Programming RPM Values in RPM Feedback Mode
Rather than writing a value such as 5000 to a 16-bit
register, an 8-bit count value is programmed instead. The
count to be programmed is given by:
(eq. 9)
Count + (f 60)R N
where:
f = 11.25 kHz
R = desired RPM value
N = Speed Range = 2
Example 1:
If the desired value for RPM Feedback Mode is 5000 RPM,
what value needs to be programmed for Count?
(eq. 10)
Count + (f 60)R N
Since the desired RPM value, R is 5000 RPM, the value
for Count is:
N = 2:
(eq. 11)
Count + (11250 60)5000 2
Count + 67500010000
Count + 67 (assumes 2 tach pulsesrev).
Example 2:
If the desired value for RPM Feedback Mode is 3650 RPM,
what value needs to be programmed for Count?
(eq. 12)
Count + (f 60)R N
Since the desired RPM value, R is 3650 RPM, the value
for Count is:
N = 2:
(eq. 13)
Count + (11250 60)3650 2
Count + 6750007300
Count + 92 (assumes 2 tach pulsesrev).
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ADM1031ARQ 功能描述:IC SENSOR 2-TEMP/FAN CTRL 16QSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 功能:溫度監(jiān)控系統(tǒng)（傳感器） 傳感器類型:內(nèi)部和外部 感應(yīng)溫度:-40°C ~ 125°C，外部傳感器 精確度:±2.5°C 本地（最大值），±5°C 遠(yuǎn)程（最大值） 拓?fù)?ADC，比較器，寄存器庫 輸出類型:2 線 SMBus? 輸出警報:無 輸出風(fēng)扇:無 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-8 供應(yīng)商設(shè)備封裝:SOT-23-8 包裝:Digi-Reel® 其它名稱:296-22675-6
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