参数资料
| 型号： | ADT7462ZEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 32/82页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR ADT7462 |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi |
| 标准包装： | 1 |
| 类型： | 温度传感器 |
| 适用于相关产品： | ADT7462 |
| 所含物品： | 评估板 |
| 其它名称： | EVAL-ADT7462EBZ EVAL-ADT7462EBZ-ND |
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ADT7462
Calculating Fan Speed
Assuming a fan with two pulses per revolution (and two
pulses per revolution being measured), fan speed is
Table 26. FAN STARTUP TIMEOUT
Bit Code Startup Timeout
calculated by:
000
No Startup Timeout
Fan Speed(RPM) + (freq
60) Fan Tachometer Reading
001
100 ms
(eq. 1)
where:
Fan Tachometer Reading is the 16-bit fan tachometer
reading. freq is the oscillator frequency, 90 kHz.
Example:
TACH1 high byte (Register 0x99) = 0x17
010
011
100
101
110
111
250 ms
400 ms
667 ms
1 sec
2 sec
32 sec
TACH1 low byte (Register 0x98) = 0xFF
What is the speed of Fan 1 in rpm?
Fan 1 Tachometer Reading + 0 17FF + 6143 Decimal
(eq. 2)
PWM Logic State
The PWM outputs can be programmed high for 100%
duty cycle (non-inverted) or low for 100% duty cycle
(inverted). This is programmed for each PWM drive in the
PWMx Configuration Registers using the INV bit (Bit 4).
RPM + (freq
60) Fan 1 Tachometer Reading
(eq. 3)
0 = Active high PWM outputs.
RPM + (90000 60) 6143
Fan Speed + 879 RPM
(eq. 4)
(eq. 5)
1 = Active low PWM outputs.
Low Frequency Mode PWM Drive Frequency
The PWM drive frequency can be adjusted for the
If the fan is a 6-pole fan, the count value is representative
of 2/3 of a revolution. Therefore, the result of Equation 5
should be divided by 1.5. Similarly, if the fan used is an
8-pole fan, then the result should be divided by 2.
Fan Spin-Up
The ADT7462 has a unique fan spin-up function. It spins
the fan at 100% PWM duty cycle until two TACH pulses are
detected on the TACH input. Once two TACH pulses have
been detected, the PWM duty cycle goes to the expected
running value, for example, 33%. The advantage of this
process is that fans have different spin-up characteristics and
require different times to overcome inertia. The ADT7462
runs the fans just fast enough to overcome inertia and the
fans are quieter on spin-up than fans programmed to spin up
for a given spin-up time.
Fan Startup Timeout
To prevent false interrupts being generated as a fan spins
up (because it is below running speed), the ADT7462
application. The ADT7462 supports both high frequency
and low frequency PWM. High or low frequency PWM
mode is selected in Register 0x02, Bit 2. In high frequency
mode, the PWM drive frequency is always 22.5 kHz and
cannot be changed. Register 0x25 and Register 0x26
configure the PWM frequency in low frequency mode for
PWM1 to PWM4.
PWM Drive Frequency 1 is set using Bits [4:2] of the
PWM1 and PWM2 frequency register (0x25).
PWM Drive Frequency 2 is set using Bits [7:5] of the
PWM1 and PWM2 frequency register (0x25).
PWM Drive Frequency 3 is set using Bits [4:2] of the
PWM3 and PWM4 frequency register (0x26).
PWM Drive Frequency 4 is set using Bits [7:5] of the
PWM3 and PWM4 frequency register (0x26).
Table 27. LOW FREQUENCY PWM OPTIONS
Bit Code Frequency
includes a fan startup timeout function. During this time, the
ADT7462 looks for two TACH pulses. If two TACH pulses
are not detected, an interrupt is generated. Using
Configuration Register 1 (0x01), Bit 4, this functionality
can be changed to spinning the fans for a programmable time
instead of two TACH pulses.
The startup timeout for each PWM drive is programmed
by Bits [2:0] in the PWMx configuration registers.
PWM1 Configuration Register = Register 0x21
PWM2 Configuration Register = Register 0x22
PWM3 Configuration Register = Register 0x23
PWM4 Configuration Register = Register 0x24
http://onsemi.com
32
000
001
010
011
100
101
110
111
11 Hz
14.7 Hz
22.1 Hz
29.4 Hz
35.3 Hz
44.1 Hz
58.8 Hz
88.2 Hz
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