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參數(shù)資料
| 型號(hào)： | MAX6651EEE+T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | Fan-Speed Regulators and Monitors with SMBus™/I<sup>2</sup>C-Compatible Interface |
| 中文描述： | BRUSHLESS DC MOTOR CONTROLLER, 0.1 A, PDSO16 |
| 封裝： | QSOP-16 |
| 文件頁數(shù)： | 16/25頁 |
| 文件大?。?/td> | 315K |
| 代理商： | MAX6651EEE+T |
Synchronizing Fans
GPIO2 can be configured to allow multiple MAX6651s
to synchronize the speeds of the fans they are driving
(Figure 14). Synchronization is accomplished by having
one of the MAX6651s (or an external clock) serve as
the clock master by configuring one of the GPIO2s in
the system as a clock output. The remaining GPIO2s in
the system need to be configured as clock inputs:
Electrically connect all MAX6651 GPIO2s together.
Configure one of the MAX6651’s GPIO2s to be a
clock output, using the GPIO Definition Register (set
bits 5 and 4 to 01).
Configure the rest of the GPIO2s as clock inputs, using
the GPIO Definition Register (set bits 5 and 4 to 00).
Configure all MAX6651s in closed-loop mode.
Configure all prescaler values to be equal.
Write identical values to all speed registers.
Setting Up Alarms
The MAX6650/MAX6651 can be configured to generate
an ALERT output on GPIO0 whenever certain events,
such as control loop out of regulation, tachometer over-
flow, or GPI01/GPI02 being driven low, occur. This is
designed to enhance the “set and forget” functionality
of the fan control system.
Configure GPIO0 to be an ALERT output (see above).
Minimum/Maximum Output Level Alarm
The minimum/maximum output level alarms are
designed to warn the system when the MAX6650/
MAX6651 are unable to maintain speed regulation in
closed-loop mode. The MAX6650/MAX6651 maintain
speed regulation by adjusting the voltage across the
fan. If the desired speed can’t be attained, one of these
alarms will be generated. Possible causes for failure to
attain the desired speed include system programming
problems, incipient fan failure, and a programmed
speed that the fan cannot support.
The minimum output alarm occurs when the DAC out-
put is 00h. A DAC value of 00h means that the
MAX6650/MAX6651 have applied the largest available
voltage across the fan. This typically means the fan is
unable to spin as fast as the desired speed.
The maximum output alarm occurs when the DAC value
is FFh. A DAC value of FFh means the MAX6650/MAX6651
have tried to reduce the voltage across the fan to 0.
Although this would seem to indicate the fan is spinning
faster than the desired speed, this should rarely hap-
pen. If this alarm occurs, it probably indicates some
type of system error.
Enable the minimum/maximum output level alarm by
setting bits 0 and 1 of the alarm enable register to 11.
Tachometer Overflow Alarm
If any tachometer counter overflows (reaches a count of
255), this alarm will be set.
Enable the overflow output level alarm by setting bit 2
of the alarm enable register bit to 1.
GPIO1/2 Pulled Low
Enabling this alarm causes the ALERT output to go low
whenever GPIO1 or GPIO2 is pulled low. This will occur
independent of the configuration of GPIO1 or GPIO2.
Enable the GPIO1/GPIO2 output level alarms by setting
bits 3 and/or 4 of the alarm enable register bit to 1.
Clearing the ALERT
Once an ALERT is generated, determine which alarm
caused the ALERT pin to go low. Do this by reading the
Alarm Status Register. An ALERT output will stay active
(low) even if the condition that caused the alert is
removed. Reading the Alarm Status Register clears the
ALERT, if the condition that caused the alert is gone. If
the condition has not gone away, the ALERT will stay
active. Disabling the alarm with the Alarm Enable
Register will cause the ALERToutput to go inactive.
Read the Alarm Status Register.
MAX6650/MAX6651
Fan-Speed Regulators and Monitors
with SMBus/I2C-Compatible Interface
______________________________________________________________________________________
23
MAX6501
GPIO2
MAX6501
GPIO2
MAX6501
GPIO2
FAN
1
FAN
2
FAN
3
CLOCK OUT
CLOCK IN
Figure 14. Synchronizing Fans
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6651EVCMAXQU | 功能描述:電源管理模塊 MAX6651 Evaluation Kit/Evaluation System RoHS:否 制造商:ROHM Semiconductor 產(chǎn)品:AC-DC Converters 最大輸入電壓:264 VAC 開關(guān)頻率: 輸出電壓:10 V to 28.8 V 輸出電流:350mA 負(fù)載調(diào)節(jié): 最大工作溫度:+ 60 C 尺寸:100 mm x 16 mm x 17 mm |
| MAX6651EVKIT | 功能描述:電源管理IC開發(fā)工具 RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| MAX6651EVSYS | 功能描述:電源管理IC開發(fā)工具 RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| MAX6652AUB | 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| MAX6652AUB+ | 功能描述:板上安裝溫度傳感器 Temperature Sensor & System Monitor RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
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