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| 型号： | ADT7473ARQZ-REEL |
| 厂商： | ON Semiconductor |
| 文件页数： | 27/73页 |
| 文件大小： | 0K |
| 描述： | IC REMOTE THERMAL CTLR 16QSOP |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi |
| 标准包装： | 2,500 |
| 系列： | dBCool® |
| 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 |
| 精确度： | ±2.5% |
| 拓扑： | ADC，比较器，风扇速度计数器，多路复用器，寄存器库 |
| 输出类型： | SMBus? |
| 输出警报： | 无 |
| 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) |
| 其它名称： | ADT7473ARQZ-REEL-ND ADT7473ARQZ-REELOSTR |
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ADT7473
If the fan output has a resistive pullup to 12 V (or other
voltage greater than 3.6 V), the fan output can be clamped
with a Zener diode, as shown in Figure 41. The Zener diode
voltage should be chosen so that it is greater than V IH of the
TACH input, but less than 3.6 V, allowing for the voltage
tolerance of the Zener. A value of between 3.0 V and 3.6 V
is suitable.
12 V V CC
PULLUP
4.7 k W TACH
TYP OUTPUT TACH
FAN SPEED
COUNTER
ZD1*
ADT7473/
ADT7473 ? 1
*CHOOSE ZD1 VOLTAGE APPROXIMATELY 0.8 ? V CC
Figure 41. Fan with TACH Pullup to Voltage > 3.6 V,
Clamped with Zener Diode
If the fan has a strong pullup (less than 1 k W ) to 12 V or
a totem-pole output, a series resistor can be added to limit the
Zener current, as shown in Figure 42.
With a pullup voltage of 12 V and pullup resistor less than
1 k W , suitable values for R1 and R2 are 120 k W and 47 k W ,
respectively. This gives a high input voltage of 3.35 V.
Fan Speed Measurement
The fan counter does not count the fan TACH output
pulses directly, because the fan speed could be less than
1,000 RPM and it would take several seconds to accumulate
a reasonably large and accurate count. Instead, the period of
the fan revolution is measured by gating an on-chip 90 kHz
oscillator into the input of a 16-bit counter for N periods of
the fan TACH output (see Figure 44), so the accumulated
count is actually proportional to the fan tachometer period,
and inversely proportional to the fan speed.
N, the number of pulses counted, is determined by the
settings of the TACH pulses per revolution register (Register
0x7B). This register contains two bits for each fan, allowing
one, two (default), three, or four TACH pulses to be counted.
CLOCK
PWM
12 V
V CC
TACH
1
2
3
TACH
FAN SPEED
4
PULLUP
TYP < 1 k W
OR TOTEM-POLE
TACH
OUTPUT
ZD1*
ZENER
COUNTER
ADT7473/
ADT7473 ? 1
Figure 44. Fan Speed Measurement
Fan Speed Measurement Registers
*CHOOSE ZD1 VOLTAGE APPROXIMATELY 0.8 ? V CC
Figure 42. Fan with Strong TACH. Pullup to > V CC or
Totem - Pole Output, Clamped with Zener and Resistor
The fan tachometer readings are 16-bit values consisting
of a 2-byte read from the ADT7473/ADT7473 ? 1.
Table 34. FAN SPEED MEASUREMENT REGISTERS
12 V
V CC
Register
0x28
0x29
Description
TACH1 Low Byte
TACH1 High Byte
Default
0x00
0x00
< 1 k W
TACH
OUTPUT
R1*
TACH
R2*
FAN SPEED
COUNTER
ADT7473/
0x2A
0x2B
0x2C
0x2D
TACH2 Low Byte
TACH2 High Byte
TACH3 Low Byte
TACH3 High Byte
0x00
0x00
0x00
0x00
ADT7473 ? 1
*SEE TEXT
0x2E
0x2F
TACH4 Low Byte
TACH4 High Byte
0x00
0x00
Figure 43. Fan with Strong TACH. Pullup to > V CC or
Totem-Pole Output, Attenuated with R1/R2
Alternatively, a resistive attenuator can be used, as shown
in Figure 43. R1 and R2 should be chosen such that
Reading Fan Speed from the ADT7473/ADT7473 ? 1
The measurement of fan speeds involves a 2-register read
for each measurement. The low byte should be read first.
This causes the high byte to be frozen until both high and low
2 V t V PULLUP
R2 R PULLUP ) R1 ) R2 t 3.6 V (eq. 3)
byte registers have been read, preventing erroneous TACH
readings. The fan tachometer reading registers report back
The fan inputs have an input resistance of nominally
160 k W to ground, which should be taken into account when
calculating resistor values.
the number of 11.11 m s period clocks (90 kHz oscillator)
gated to the fan speed counter, from the rising edge of the
first fan TACH pulse to the rising edge of the third fan TACH
http://onsemi.com
27
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相关代理商/技术参数 |
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|---|---|
| ADT7473ARQZ-REEL7 | 功能描述:IC REMOTE THERMAL CTRLR 16QSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热管理 系列:dBCool® 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 |
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| ADT7473EBZEVB | 功能描述:EVALUATION BOARD ADT7473 制造商:on semiconductor 系列:* 零件状态:在售 标准包装:1 |
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| ADT7475 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:dBCOOL Remote Thermal Monitor and Fan Controller |
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