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| 型号： | MAX6639ATE+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 14/22页 |
| 文件大小： | 0K |
| 描述： | IC TEMP MONITOR 2CH 16-TQFN |
| 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 |
| 精确度： | ±2°C 本地（最大），±1°C 远程（最大） |
| 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-WQFN 裸露焊盘 |
| 供应商设备封装： | 16-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
MAX6639/MAX6639F
2-Channel Temperature Monitor with Dual,
Automatic, PWM Fan-Speed Controller
Table 5. Fan Duty-Cycle Rate-of-Change
REGISTER 10h
NOMINAL RATE
ACTUAL RATE OF CHANGE AT SPECIFIC PWM FREQUENCIES
NOMINAL TIME FROM
OR 14h D[6:4]
000
001
010
011
100
101
110
111
OF CHANGE (s)
0
0.0625
0.125
0.25
0.5
1
2
4
100Hz (s)
0
0.06
0.13
0.25
0.5
1
2
4
50Hz (s)
0
0.06
0.12
0.26
0.5
1
2
4
33.3Hz (s)
0
0.06
0.12
0.24
0.51
0.99
1.98
3.96
20Hz (s)
0
0.05
0.15
0.25
0.5
1
2
4
33% TO 100% (s)
0
5
10
20
40
80
160
320
Fan 1 and 2 Configuration 1 (10h and 14h)
The following registers control the modes of operation
of the MAX6639:
? D7: PWM Mode. D7 = 1 sets the fan into manual
PWM duty-cycle control mode. Write the target duty
cycle in the fan duty-cycle register. D7 = 0 puts the
fan into RPM control mode. To set RPM manually, set
both fan-control temperature channels (bits D2 and
D3) to zero and write the desired tachometer count
into the TACH count register.
? D[6:4]: Fan Duty-Cycle Rate-of-Change. D[6:4]
sets the time between increments of the duty cycle.
Each increment is 1/120 of the duty cycle. By adjust-
ing the rate-of-change, audibility of fan-speed
changes can be traded for response time. Table 5
Table 6. Fan RPM Speed
shows the effect of D[6:4] and, for reference, the time
required for the fan speed to change from 33% to
100% duty cycle as a function of the rate-of-change
bits.
? D[3:2]: Temperature Channel(s) for Fan Control.
Selects the temperature channel(s) that control the
PWM output when the MAX6639 is in automatic RPM
control mode (PWM mode bit is zero). If two chan-
nels are selected, the fan goes to the higher of the
two possible speeds. If neither channel is selected,
then the fan is in manual RPM mode and the speed
is forced to the value written to the target tach count
register 22h or 23h.
? D[1:0]: RPM Range. Scales the tachometer counter
by setting the maximum (full-scale) value of the RPM
range to 2000, 4000, 8000, or 16,000. (Table 3
shows the internal clock frequency as a function of
REGISTER 10h OR 14h
00
01
10
11
FAN MAXIMUM RPM VALUE
2000
4000
8000
16,000
the range.)
Table 7. RPM-to-Tachometer Count Relationship Examples
MAXIMUM RPM VALUE
2000
4000
4000
4000
16,000
16,000
ACTUAL RPM
1000
1000
3000
3000
8000
8000
SELECTED NUMBER
OF PULSES PER
REVOLUTION
2
2
2
2
4
4
ACTUAL FAN PULSES
PER REVOLUTION
2
2
2
4
4
2
TACHOMETER COUNT
VALUE*
3Ch
78h
28h
14h
3Ch
78h
*Tachometer count value = ((internal clock frequency) x 60) / actual RPM) (selected number of pulses per revolution / actual fan pulses)
14
Maxim Integrated
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