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| 型號： | 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 |
| 文件頁數(shù)： | 50/88頁 |
| 文件大小： | 836K |
| 代理商： | ADT7462ACPZ-500RL7 |
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ADT7462
Rev. 2 | Page 54 of 88 | www.onsemi.com
90
80
70
60
50
40
0
30
20
10
PWM DUTY CYCLE (%)
RTEMP (°C)
0556
9-
07
1
Figure 82. How Fan Reacts to Temperature Variations
in Enhanced Acoustics Mode
Slower Ramp Rates
The ADT7462 can be programmed for much longer ramp times
by slowing the ramp rates. Each ramp rate can be slowed by a
factor of 4.
PWM1 Configuration Register (0x21)
PWM2 Configuration Register (0x22)
PWM3 Configuration Register (0x23)
PWM4 Configuration Register (0x24)
Setting Bit 3 (the SLOW bit) to 1 in the PWM1 to PWM4
configuration registers slows the ramp rate for PWM1 to
PWM4 by 4.
FAN FREEWHEELING TEST MODE
The fan freewheeling test mode is intended to diagnose whether
fans connected to the ADT7462 are working properly. It is
particularly useful where fans coupled in the duct can affect the
airflow of another fan. If one fan has failed, it may not be
apparent, because moving air from other fans can cause air to
flow through the faulty fan, which in turn can cause the faulty
fan to rotate.
The fan freewheeling test is most useful in a system using
primary and redundant setup. In such a system, the following
setup is recommended. The primary fans are Fan 1, Fan 2, Fan 3,
and Fan 4. The redundant fans are Fan 5, Fan 6, Fan 7, and Fan 8.
In this setup, each primary and redundant fan can be driven
separately because they are driven by different PWMs.
PWM 1PWM 2
PWM 3
PWM 4
TACH CCT 1
TACH CCT 2
TACH CCT 3
TACH CCT 4
FAN 1
FAN 2
FAN 3
FAN 4
FAN 5
FAN 6
FAN 7
FAN 8
05
56
9-
07
2
Figure 83. Fan Freewheeling Test Mode Setup
The freewheeling test procedure is as follows:
1.
PWM1 and PWM2 go to full speed, and PWM3 and PWM4
are switched off.
2.
After the spin-up time of PWM1 and PWM2 has elapsed, the
speed of Fan 1, Fan 2, Fan 3, and Fan 4 is measured.
3.
After the speed of Fan 1 and Fan 2 is measured, PWM1 is
switched off and PWM3 is spun up. After the spin-up time for
PWM3 has elapsed, the speed of Fan 5 and Fan 6 is measured.
4.
After the speed of Fan 3 and Fan 4 is measured, PWM2 is
switched off and PWM4 is switched on. After the spin-up time
of PWM4 has elapsed, the speed of Fan 7 and Fan 8 is
measured.
5.
After the speed of all eight fans has been measured, the TACH
and PWM configurations return to their previous values.
a. Fans must be in continuous mode for the freewheeling test;
that is, the dc bits must be set (Register 0x08).
b. To enable the freewheeling test, set the freewheeling test
enable register (0x1E) to a nonzero value. Set
Bit 0 = 1 to enable the freewheeling test for Fan 1, and set
Bit 1 for Fan 2, all the way to Bit 7 for Fan 8. The
freewheeling test enable register should be programmed
after the fans present register is programmed. If the fans
present register is not programmed first, then the values in
the two registers do not match, and the ADT7462 assumes
that a fan is missing.
The following registers must be programmed for the fan
freewheeling test:
Fans Present Register (0x1D)
Set Bit 0 to 1 when a fan is connected to TACH1.
Set Bit 1 to 1 when a fan is connected to TACH2.
Set Bit 2 to 1 when a fan is connected to TACH3.
Set Bit 3 to 1 when a fan is connected to TACH4.
Set Bit 4 to 1 when a fan is connected to TACH5.
Set Bit 5 to 1 when a fan is connected to TACH6.
Set Bit 6 to 1 when a fan is connected to TACH7.
Set Bit 7 to 1 when a fan is connected to TACH8.
Fan Freewheeling Test Enable Register (0x1E)
Set Bit 0 to 1 to enable the freewheeling test for Fan 1.
Set Bit 1 to 1 to enable the freewheeling test for Fan 2.
Set Bit 2 to 1 to enable the freewheeling test for Fan 3.
Set Bit 3 to 1 to enable the freewheeling test for Fan 4.
Set Bit 4 to 1 to enable the freewheeling test for Fan 5.
Set Bit 5 to 1 to enable the freewheeling test for Fan 6.
Set Bit 6 to 1 to enable the freewheeling test for Fan 7.
Set Bit 7 to 1 to enable the freewheeling test for Fan 8.
Fan Freewheeling Test Register (0x1C)
Both the Fans Present register (0x1D) and the freewheeling test
enable register (0x1E) should be programmed before setting
the relevant bits in the fan freewheeling test register (0x1C).
The host fan status register (0xBD) should be read directly after
completion of the test.
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