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| 型号： | ADM1029ARQZ-R7 |
| 厂商： | ON Semiconductor |
| 文件页数： | 16/50页 |
| 文件大小： | 402K |
| 描述： | IC SENSOR 2TEMP/FAN CTRL 24QSOP |
| 产品变化通告： | QSOP 24ld Pkg (MSL) Change 17/Jun/2010 |
| 标准包装： | 1,000 |
| 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： | 0°C ~ 100°C，外部传感器 |
| 精确度： | ±1°C 本地，±3°C 远程 |
| 拓扑： | ADC，风扇控制，寄存器库 |
| 输出类型： | 开路漏极 |
| 输出警报： | 是 |
| 输出风扇： | 是 |
| 电源电压： | 3 V ~ 5.5 V |
| 工作温度： | 0°C ~ 100°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 24-QSOP |
| 包装： | 带卷 (TR) |
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ADM1029
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16
Figure 27. Fan with Strong Tach. Pull-up to > V
CC
or
Totem-pole Output, Clamped with Zener and Resistor
12 V
V
CC
FAN SPEED
COUNTER
TACH
OUTPUT
TACH1
OR
TACH 2
PULL-UP
TYP < 1 kW
OR TOTEM-POLE
ZD1*
ZENER
* Choose ZD1 Voltage Approx. 0.8 ?V
CC
R1
10 kW
Figure 28. Fan with Strong Tach. Pull-up to > V
CC
or
Totem-pole Output, Attenuated with R1/R2
12 V
V
CC
FAN SPEED
COUNTER
TACH
OUTPUT
TACH1
OR
TACH 2
< 1 kW
R2*
*
See
Text
R1*
Fan Speed Control
Fan speed is controlled using pulsewidth modulation
(PWM). The PWM outputs (Pins 1 and 24) give a pulse
output with a programmable frequency (default 250 Hz) and
a duty-cycle defined by the contents of the relevant fan speed
register, or by the automatic fan speed control when this
mode is enabled. The speed at which a fan runs is determined
by fault conditions and the settings of various control and
mask registers.
A fan can only be driven if it is defined as being supported
by the controller in register 02h. The ADM1029 supports up
to two fans, so Bits 0 and 1 of this register are permanently
set. This register is read-only.
A fan will only be driven if it is defined as being supported
by the system in register 03h. If Bit 0 of this register is set,
it indicates that Fan 1 is installed. This is the power-on
default. If Bit 1 is set, it indicates that Fan 2 is installed. This
bit is set by the state of Pin 18 at power-up. This register is
read/write and the default/power-on setting can be
overwritten. If a fan is not supported in register 03h it will
not be driven, even if it is physically installed.
The PWM outputs are open-drain outputs. They require
pull-up resistors and must be amplified and buffered to drive
the fans.
Minimum Speed
The normal operating fan speed is set by the four LSBs of
the Fan 1 and Fan 2 Minimum/Alarm Speed Registers
(addresses 60h, 61h). These bits also set the minimum speed
at which a fan will run in automatic control mode. These bits
should be set to 05h. This corresponds to 33% PWM
duty-cycle, which is the lowest speed at which most fans will
run reliably.
Fan(s) will run at minimum speed if there is no fault
condition, automatic fan speed is disabled, and there are no
other overriding conditions.
Alarm Speed
Alarm speed is set by the four MSBs of the Fan 1 and
Fan 2 Minimum/Alarm Speed Registers (addresses 60h,
61h). Fan(s) will run at alarm speed if any of the following
conditions occurs, assuming the condition has not been
masked out using the Fan Event Mask Registers:
?SPAN class="pst ADM1029ARQZ-R7_2295375_7"> Setting Bit 0 of register 07h forces Fan 1 to run at alarm
speed (Set Fan x Alarm Speed Register).
?SPAN class="pst ADM1029ARQZ-R7_2295375_7"> Setting Bit 1 of register 07h forces Fan 2 to run at alarm
speed (Set Fan x Alarm Speed Register).
If monitoring is disabled by clearing Bit 4 of the
Configuration Register, all fans controlled by the
ADM1029 will run at alarm speed.
?SPAN class="pst ADM1029ARQZ-R7_2295375_7"> When a GPIO pin is configured as an input by setting
Bit 0 of the corresponding GPIO Behavior Register,
and Bit 4 of the GPIO Behavior Register is also set, all
fans controlled by the ADM1029 will go to alarm speed
when the logic input is asserted (high or low, depending
on the polarity bit, Bit 1 of the corresponding GPIO
Behavior Register).
?SPAN class="pst ADM1029ARQZ-R7_2295375_7"> If Bit 7 of a Fan Fault Action Register is set
(18h Fan 1, 19h Fan 2) the corresponding fan will
go to alarm speed when CFAULT
is pulled low by an
external source.
?SPAN class="pst ADM1029ARQZ-R7_2295375_7"> If a tach measurement exceeds the set limit, all fans
controlled by the ADM1029 will run at alarm speed.
?SPAN class="pst ADM1029ARQZ-R7_2295375_7"> If a fan fault input pin is asserted (low), all fans
controlled by the ADM1029 will run at alarm speed.
?SPAN class="pst ADM1029ARQZ-R7_2295375_7"> If Bit 1 of a Temp. Fault Action Register is set
(40h Local Sensor, 41h Remote 1, 42h Remote 2),
all fans controlled by the ADM1029 will go to alarm
speed if the corresponding temperature high limit is
exceeded.
?SPAN class="pst ADM1029ARQZ-R7_2295375_7"> If Bit 5 of a Temp. Fault Action Register is set, all fans
controlled by the ADM1029 will go to alarm speed if a
temperature input crosses the corresponding
temperature low limit, the direction depending on the
setting of Bit 3 of the Temp. Control register.
(0 = alarm when input goes below low limit, 1 = alarm
when input goes above low limit).
?SPAN class="pst ADM1029ARQZ-R7_2295375_7"> If Bit 1 of an AIN Behavior Register is set
(50h AIN0, 51h AIN1), all fans controlled by the
ADM1029 will go to alarm speed if the corresponding
AIN high limit is exceeded.
?SPAN class="pst ADM1029ARQZ-R7_2295375_7"> If Bit 5 of an AIN Behavior Register is set, all fans
controlled by the ADM1029 will go to alarm speed if
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