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参数资料
| 型号： | MAX6639YAEE+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 10/22页 |
| 文件大小： | 0K |
| 描述： | IC TEMP MONITOR 2CH 16-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 功能： | 风扇控制，温度监控器 |
| 传感器类型： | 内部和外部 |
| 感应温度： | 0°C ~ 150°C，外部传感器 |
| 拓扑： | ADC，PWM 发生器，转速计计数器 |
| 输出类型： | I²C?/SMBus? |
| 输出警报： | 是 |
| 输出风扇： | 是 |
| 电源电压： | 3 V ~ 3.6 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 带卷 (TR) |
MAX6639/MAX6639F
2-Channel Temperature Monitor with Dual,
Automatic, PWM Fan-Speed Controller
RPM
TACH
0xFFh
T MIN-5
T MIN
T B
TEMPERATURE
RPM MAX
TACH B+1
TACH MAX
TACH A+1
TACH B+1
RPM MIN
TACH A+1
TACH MIN
0
TEMPERATURE
T MIN -5
T MIN
T B
Figure 4. Tachometer Target Calculation
are 30h to 60h. Set the value to correspond to the full-
rated RPM of the fan. See Figure 4.
Figure 5 shows how the MAX6639 calculates the target
tachometer value based on the measured temperature.
At T MIN , the fan spins at a minimum speed value corre-
sponding to the maximum tachometer count value
stored in register 22h or 23h. Bit 0 of register 11h (fan
1) and register 15h (fan 2) selects the behavior below
T MIN . If bit 0 is equal to zero, the fan is completely off
below T MIN . When the temperature is falling, it must
drop 5 ° C below T MIN before the fan turns off. If bit 0 is
set to 1, the fan does not turn off below T MIN , but
instead stays at the maximum tachometer count in reg-
ister 22h or 23h.
When the measured temperature is higher than T MIN ,
the MAX6639 calculates the target tachometer count
value based on two linear equations. The target
tachometer count decreases by the tach step size
value stored in bits 7 through 4 of registers 11h and
15h each time the measured temperature increases by
the temperature step size value stored in bits 2 and 3 of
registers 11h and 15h. As the measured temperature
continues to increase, a second tachometer step size
goes into effect. Bits 3 through 0 of register 12h and
16h select the number temperature/PWM steps after
which the new step size takes effect. The new step size
is selected by bits 7 to 4 of registers 12h and 16h.
10
Figure 5. RPM Target Calculation
Register Descriptions
Channel 1 and Channel 2 Temperature Registers
(00h and 01h)
These registers contain the results of temperature mea-
surements. The MSB has a weight of +128 ° C and the
LSB +1 ° C. Temperature data for remote diode 1 is in
the channel 1 temperature register. Temperature data
for remote diode 2 or the local sensor (selectable by bit
4 in the global configuration register) is in the channel 2
temperature register. Three additional temperature bits
provide resolution down to 0.125 ° C and are in the
channel 1 extended temperature (05h) and channel 2
extended temperature (06h) registers. The channel 1
and channel 2 temperature registers do not update until
at least 250ms after the access of the associated
extended temperature registers. All values below 0°C
return 00h.
Status Register (02h)
A 1 indicates that an ALERT , THERM , OT , or fan fault has
occurred. Reading this register clears bits 7, 6, 1, and 0.
Reading the register also clears the ALERT and
FANFAIL outputs, but not the THERM and OT outputs. If
the fault is still present on the next temperature measure-
ment cycle, any cleared bits and outputs are set again. A
successful alert response clears the values on the out-
puts but does not clear the status register bits. The
ALERT bits assert when the measured temperature is
higher than the respective thresholds. The THERM and
OT outputs behave like comparators with 5 ° C hysteresis.
Maxim Integrated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX663C/D | 功能描述:低压差稳压器 - LDO RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MAX663CJA | 功能描述:低压差稳压器 - LDO RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MAX663CPA | 功能描述:低压差稳压器 - LDO 5V Prog uPower Voltage Regulator RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MAX663CPA+ | 功能描述:低压差稳压器 - LDO 5V Prog uPower Voltage Regulator RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MAX663CSA | 功能描述:低压差稳压器 - LDO 5V Prog uPower Voltage Regulator RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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