参数资料
| 型号： | ADT7467BBZEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 28/72页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR ADT7467 |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi |
| 标准包装： | 1 |
| 系列： | dBCool® |
| 传感器类型： | 温度 |
| 传感范围： | -40°C ~ 120°C |
| 接口： | SMBus（2 线/I²C） |
| 灵敏度： | ±1.5°C |
| 电源电压： | 3 V ~ 5.5 V |
| 嵌入式： | 否 |
| 已供物品： | 板，缆线，CD |
| 已用 IC / 零件： | ADT7467 |
| 其它名称： | EVAL-ADT7467EBZ EVAL-ADT7467EBZ-ND |
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ADT7467
number of pulses per revolution output for a given fan. By
plotting fan speed measurements at 100% speed with
different pulses per revolution setting, the smoothest graph
Table 31. CONFIGURATION REGISTER 4 (REG. 0X7D)
Bit Mnemonic Description
with the lowest ripple determines the correct pulses per
revolution value.
Table 28. FAN PULSES/REVOLUTION REGISTER
(REG. 0X7B)
<3:2>
AINL
Input threshold for 2-wire fan
speed measurements.
00 = ? 20 mV
01 = ? 40 mV
10 = ? 80 mV
11 = ? 130 mV
Bit
<1:0>
<3:2>
<5:4>
<7:6>
Mnemonic
FAN1 Default
FAN2 Default
FAN3 Default
FAN4 Default
Description
2 Pulses per Revolution
2 Pulses per Revolution
2 Pulses per Revolution
2 Pulses per Revolution
Fan Spin-up
The ADT7467 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. Then, the PWM duty cycle
goes to the expected running value, for example, 33%. The
advantage is that fans have different spin-up characteristics
Table 29. FAN PULSES/REVOLUTION REGISTER
BIT VALUES
Value Description
00 1 Pulse per Revolution
and take different times to overcome inertia. The ADT7467
runs the fans just fast enough to overcome inertia and is
quieter during spin-up than other fans programmed to spin
up for a given spin-up time.
01
10
11
2 Pulses per Revolution
3 Pulses per Revolution
4 Pulses per Revolution
Fan Start-up Timeout
To prevent the generation of false interrupts as a fan spins
up (because it is below running speed), the ADT7467
includes a fan start-up timeout function. During this time,
2-wire Fan Speed Measurements
(Low Frequency Mode Only)
The ADT7467 is capable of measuring the speed of 2-wire
fans, that is, fans without TACH outputs. To do this, the fan
must be interfaced as shown in the Driving 2-Wire Fans
section. In this case, the TACH inputs should be
reprogrammed as analog inputs, AIN.
the ADT7467 looks for two TACH pulses. If two TACH
pulses are not detected, an interrupt is generated. Using
Configuration Register 1 (0x40) Bit 5 (FSPDIS), the
functionality of this bit can be changed (see the Disabling
Fan Start-up Timeout section).
Table 32. PWM1 TO PWM3 CONFIGURATION
(REG. 0X5C TO 0X5E)
Table 30. CONFIGURATION REGISTER 2 (REG. 0X73)
Bit
Mnemonic
Description
Bit
3
2
Mnemonic
AIN4
AIN3
Description
1 indicates that Pin 9 is reconfigured to
measure the speed of a 2-wire fan using
an external sensing resistor and
coupling capacitor.
1 indicates that Pin 4 is reconfigured to
measure the speed of a 2-wire fan using
an external sensing resistor and
coupling capacitor.
<2:0>
SPIN
These bits control the start-up
timeout for PWM1, PWM2, PWM3.
000 = No Start-up Timeout
001 = 100 ms
010 = 250 ms (Default)
011 = 400 ms
100 = 667 ms
101 = 1 s
110 = 2 s
111 = 4 s
1
0
AIN2
AIN1
1 indicates that Pin 7 is reconfigured to
measure the speed of a 2-wire fan using
an external sensing resistor and
coupling capacitor.
1 indicates that Pin 6 is reconfigured to
measure the speed of a 2-wire fan using
an external sensing resistor and
coupling capacitor.
Disabling Fan Start-up Timeout
Although a fan start-up makes fan spin-ups more quiet
than fixed-time spin-ups, users can use fixed spin-up times.
Setting Bit 5 (FSPDIS) to 1 in Configuration Register 1
(0x40) disables the spin-up for two TACH pulses, and the
fan spins up for the fixed time selected in Register 0x5C to
AIN Switching Threshold
Register 0x5E.
Having configured the TACH inputs as AIN inputs for
2-wire measurements, a user can select the sensing threshold
for the AIN signal.
http://onsemi.com
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