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參數(shù)資料
| 型號： | MAX6664 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Temperature Monitors and PWM Fan Controllers |
| 中文描述： | 溫度監(jiān)視器和PWM風扇控制器 |
| 文件頁數(shù)： | 8/24頁 |
| 文件大?。?/td> | 297K |
| 代理商： | MAX6664 |
The MAX6663 resets its
INT
output and some of the
status bits in the status register after responding to an
alert response address; however, if the error condition
that caused the interrupt is still present,
INT
is reassert-
ed on the next monitoring cycle.
INT
is maskable to
allow full control of ALERT conditions.
Temperature Measurement
The MAX6653/MAX6663/MAX6664 contain on-chip tem-
perature sensors to sense their own die (local) tempera-
tures. These devices can also measure remote
temperatures such as the die temperature of CPUs or
other ICs having on-chip temperature-sensing diodes, or
discrete diode-connected transistors as shown in the
Typical Operating Circuits
. For best accuracy, the dis-
crete diode-connected transistor should be a small-signal
device with its collector and base connected together.
The on-chip ADC converts the sensed temperature and
outputs the temperature data in the format shown in
Tables 3 and 4. The temperature measurement resolution
is 0.125
°
C for both local and remote temperatures. The
temperature accuracy is within ±1
°
C for remote tempera-
ture measurements from +60
°
C to +100
°
C.
The Local Temperature Offset (0Dh) and Remote
Temperature Offset (0Eh) registers allow the measured
temperature to be increased or decreased by a fixed
value to compensate for errors due to variations in diode
resistance and ideality factor (see the
Remote Diode
Considerations
section). The reported temperature is the
measured temperature plus the correction value. Both the
measured temperature and the reported value are limited
by the sensor
’
s temperature range. For example, if a
remote thermal diode is being measured and its tempera-
ture is 135
°
C, the measured temperature is the maximum
value of 127.875
°
C. If the remote offset value is set to -
10
°
C, the reported value is 117.875
°
C, not 125
°
C.
The temperature conversion rate is programmable using
bits [4:2] of the fan filter register (23h) as shown in Table 5.
The DXN input is biased at 0.65V above ground by an
internal diode to set up the analog-to-digital inputs for a
differential measurement. The worst-case DXP-DXN dif-
ferential input voltage range is from 0.25V to 0.95V.
Excess resistance in series with the remote diode caus-
es about 0.5
°
C error per ohm. Likewise, a 200μV offset
voltage forced on DXP-DXN causes about 1
°
C error.
High-frequency EMI is best filtered at DXP and DXN with
an external 2200pF capacitor. This value can be
increased to about 3300pF, including cable capacitance.
Capacitance higher than 3300pF introduces errors due to
the rise time of the switched current source.
M
Temperature Monitors and
PWM Fan Controllers
8
_______________________________________________________________________________________
Figure 3. SMBus Read Timing Diagram
SMBCLK
A
B
C
D
E
F
G
H
I
J
K
SMBDATA
t
SU:STA
t
HD:STA
t
LOW
t
HIGH
t
SU:DAT
t
HD:DAT
t
SU:STO
t
BUF
L
M
F = ACKNOWLEDGE BIT CLOCKED INTO MASTER
G = MSB OF DATA CLOCKED INTO MASTER
H = LSB OF DATA CLOCKED INTO MASTER
I = MASTER PULLS DATA LINE LOW
J = ACKNOWLEDGE CLOCKED INTO SLAVE
K = ACKNOWLEDGE CLEAR PULSE
L = STOP CONDITION, EXECUTED BY SLAVE
M = NEW START CONDITION
A = START CONDITION
B = MSB OF ADDRESS CLOCKED INTO SLAVE
C = LSB OF ADDRESS CLOCKED INTO SLAVE
D = R/W BIT CLOCKED INTO SLAVE
E = SLAVE PULLS SMBDATA LINE LOW
Table 3. Temperature Data High Byte Format
TEMP (
°
C)
DIGITAL
OUTPUT (
°
C)
DIGITAL OUTPUT
(BINARY)
130.00
127.00
126.00
25.25
0.50
0.00
-1
-125
-128
+127
+127
+126
+25
0
0
—
—
—
0111 1111
0111 1111
0111 1110
0001 1001
0000 0000
0000 0000
1111 1111
1000 0011
1000 0000
Diode fault
(short or open)
—
1000 0000
相關PDF資料 |
PDF描述 |
|---|---|
| MAX6663AEE | RF CONNECTOR; 50 OHM REVERSE POLARITY BNC MALE RIGHT ANGLE, CLAMP ATTACHMENT FOR RG178 & RG196; *MEETS FCC PART 15.203 REQUIREMENTS* |
| MAX6664AEE | Temperature Monitors and PWM Fan Controllers |
| MAX6653AEE | HEX INVERTERS 20-LCCC -55 to 125 |
| MAX6657-MAX6659 | 【1∑C, SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6664AEE | 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 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
| MAX6664AEE+ | 功能描述:板上安裝溫度傳感器 Temperature Monitor & PWM Fan Controller RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 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 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
| MAX6664AEE+T | 功能描述:板上安裝溫度傳感器 Temperature Monitor & PWM Fan Controller RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 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 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
| MAX6664AEE-T | 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 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
| MAX6664AEE-TG075 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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