參數(shù)資料
型號： ADM1029ARQZ-R7
廠商： ON Semiconductor
文件頁數(shù)： 23/50頁
文件大?。?/td> 402K
描述： IC SENSOR 2TEMP/FAN CTRL 24QSOP
產(chǎn)品變化通告： QSOP 24ld Pkg (MSL) Change 17/Jun/2010
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 本地，±3°C 遠(yuǎn)程
拓?fù)洌?/td> ADC，風(fēng)扇控制，寄存器庫
輸出類型： 開路漏極
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： 24-SSOP（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 24-QSOP
包裝： 帶卷 (TR)
ADM1029
http://onsemi.com
23
Table 13. RESISTOR RATIOS FOR SETTING TMIN AND NUMBER OF FANS INSTALLED USING TMIN/INSTALL PIN
(PIN 18)
3 MSBs of
ADC
Ideal Ratio
R2/(R1 + R2)
R1 (kW)
R2 (kW)
Actual
R2/(R1 + R2)
Error (%)
T
MIN
Fans Installed
111
N/A
0
?/DIV>
1
0
Disabled
2
110
0.8125
18
82
0.82
0.75
48癈
2
101
0.6875
22
47
0.6812
0.63
40癈
2
100
0.5625
12
15
0.5556
0.69
32癈
2
011
0.4375
15
12
0.4444
0.69
32癈
1
010
0.3125
47
22
0.3188
0.63
40癈
1
001
0.1875
82
18
0.18
0.75
48癈
1
000
N/A
?/DIV>
0
0
0
Disabled
1
In this case, since the Minimum Duty Cycle is the default
33%, the equation for T
MAX
 reduces to:
(eq. 10)
T
MAX
+ T
MIN
) ((Max DC * Min DC) T
RANGE
10)
T
MAX
+ T
MIN
) ((15 * 5) T
RANGE
10)
T
MAX
+ T
MIN
) (10 T
RANGE
10)
T
MAX
+ T
MIN
) T
RAN  E
Enabling Automatic Fan Speed Control Using
TMIN/INSTALL Pin (Pin 18)
Automatic fan control can also be enabled in hardware by
Pin 18 (TMIN/INSTALL). This is an 8-level input with
multiple functions, which is sampled only at power-up.
If only one fan is installed, the voltage on Pin 18 should
be kept at less than V
CC
/2, which clears Bit 1 of register 03h.
Within this voltage range, four voltage levels define the
minimum temperature at which the fan will operate in
automatic speed control mode.
If two fans are installed, the voltage on Pin 18 should be
between V
CC
/2 and V
CC
, which sets Bit 1 of register 03h.
Within this voltage range, four voltage levels define the
minimum temperature at which the fans will operate in
automatic speed control mode.
Resistor values for setting the voltage on Pin 18 are given
in Table 13. If automatic fan speed control is not used,
Pin 18 can simply be strapped to ground (one fan) or V
CC
(two fans), depending on how many fans are installed.
Under this condition, the fans will run full speed until the
device is written to by software to change fan speed.
When automatic fan speed control is enabled at power-up
by the TMIN/INSTALL pin, Bit 4 of the Configuration
register is set to enable monitoring, and Bits 0 and 1 of all
Temp. Cooling Action Registers are set, so any temperature
channel will automatically control all fans that are installed.
NOTE:   if automatic fan speed control is enabled and an event
occurs that would cause a fan to go to alarm or hot-plug
speed (e.g., temperature fault), that event will override the
automatic fan speed control. If the event affects only one
fan, the other fan will remain under automatic control.
Fan-related Registers
Table 14 is a list of registers on the ADM1029 that are
specific to fan speed measurement and control:
Table 14. TEMPERATURE-SPECIFIC REGISTERS
Address
Description
0x02
Fans Supported By Controller
0x03
Fans Supported In System
0x07
Set Fan x Alarm Speed
0x08
Set Fan x Hot-Plug Speed
0x09
Set Fan x Full Speed
0x10
Fan 1 Status
0x11
Fan 2 Status
0x18
Fan 1 Fault Action
0x19
Fan 2 Fault Action
0x20
Fan 1 Event Mask
0x21
Fan 2 Event Mask
0x48
Local Temp Cooling Action
0x49
Remote 1 Cooling Action
0x4A
Remote 2 Cooling Action
0x60
Fan 1 Minimum/Alarm Speed
0x61
Fan 2 Minimum/Alarm Speed
0x68
Fan 1 Configuration
0x69
Fan 2 Configuration
0x70
Fan 1 Tach Value
0x71
Fan 2 Tach Value
0x78
Fan 1 Tach High Limit
0x79
Fan 2 Tach High Limit
Fan Configuration Registers
Registers 0x68 and 0x69 are the Fan 1 and Fan 2
Configuration Registers. These allow the PWM output
frequencies to be selected for each fan. The default PWM
drive frequency is 250 Hz. Bits <7:6> adjust the fan tach
oscillator frequency for fan tach measurements. Bits <3:0>
allow the Hot Plug PWM duty cycle value for each fan to be
programmed.
Figures 36 and 37 show how to configure the fans to
handle thermal or fault events.
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