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參數(shù)資料
| 型號(hào)： | ADT7462ACPZ-500RL7 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 4Cel, SQUARE, SURFACE MOUNT |
| 封裝： | 5 X 5 MM, LFCSP-32 |
| 文件頁(yè)數(shù)： | 29/88頁(yè) |
| 文件大?。?/td> | 836K |
| 代理商： | ADT7462ACPZ-500RL7 |
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ADT7462
Rev. 2 | Page 35 of 88 | www.onsemi.com
To enable fan speed measurements four times a second, set the
FAST bit (Bit 0) of Configuration Register 2 (0x02). When the
FAST bit is set, fan TACH readings are updated every 250 ms.
Fan Speed Measurement Registers
Fan speed measurement 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 byte registers
have been read, preventing erroneous TACH readings. The fan
tachometer reading registers report back the number of 11.11
μs 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 pulse (because two pulses per
revolution are being counted). Because the device is essentially
measuring the fan TACH period, the higher the count value,
the slower the fan is actually running. A 16-bit fan tachometer
reading of 0xFFFF indicates either that the fan has stalled or is
running very slowly (<100 rpm).
The actual fan TACH period is being measured; therefore, an
ALERT is generated if the reading falls below a fan TACH limit.
This ALERT sets the appropriate status bit and can be used to
generate an SMBALERT. The TACH limit is an 8-bit value that
is compared with the TACH high byte of the TACH reading.
Table 25. Tachometer Value and Limit Registers
TACH
Low Byte
Value Register
High Byte
Value Register
8-Bit Limit
Register
TACH1
0x98
0x99
0x78
TACH2
0x9A
0x9B
0x79
TACH3
0x9C
0x9D
0x7A
TACH4
0x9E
0x9F
0x7B
TACH5
0xA2
0xA3
0x7C
TACH6
0xA4
0xA5
0x7D
TACH7
0xA6
0xA7
0x7E
TACH8
0xA8
0xA9
0x7F
Calculating Fan Speed
Assuming a fan with two pulses per revolution (and two pulses
per revolution being measured), fan speed is calculated by
Fan Speed (rpm) = (freq × 60)/Fan Tachometer Reading
(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
TACH1 low byte (Register 0x98) = 0xFF
What is the speed of Fan 1 in rpm?
Fan 1 Tachometer Reading = 0x17FF = 6143 Decimal
(2)
RPM = (freq × 60)/Fan 1 Tachometer Reading
(3)
RPM = (90000 × 60)/6143
(4)
Fan Speed = 879 rpm
(5)
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 Start-Up Timeout
To prevent false interrupts being generated as a fan spins up
(because it is below running speed), the ADT7462 includes a
fan start-up 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 start-up 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
Table 26. Fan Start-Up Timeout
Bit Code
Start-Up Timeout
000
No start-up timeout
001
100 ms
010
250 ms
011
400 ms
100
667 ms
101
1 sec
110
2 sec
111
32 sec
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