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MAX6639 Datasheet(PDF) 15 Page - Maxim Integrated Products

Part No. MAX6639
Description  2-Channel Temperature Monitor with Dual, Automatic, PWM Fan-Speed Controller
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX6639 Datasheet(HTML) 15 Page - Maxim Integrated Products

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Fan 1 and 2 Configuration 2a (11h and 15h)
The following registers apply to the automatic RPM
control mode:
• D[7:4]: Fan RPM (Tachometer) Step-Size A.
Selects the number of tachometer counts the target
value decreases for each temperature step increase
above the fan-start temperature. Value = n + 1 (1
through 16) where n is the value of D[7:4].
• D[3:2]: Temperature Step Size. Selects the temper-
ature increment for fan control. For each temperature
step increase, the target tachometer count decreas-
es by the value selected by D[7:4] (Table 8).
• D1: PWM Output Polarity. PWM output is low at
100% duty cycle when this bit is set to zero. PWM
output is high at 100% duty cycle when this bit is set
to 1.
• D0: Minimum Speed. Selects the value of the mini-
mum fan speed (when temperature is below the fan-
start temperature in the automatic RPM control
mode). Set to zero for 0% fan drive. Set to 1 to deter-
mine the minimum fan speed by the tachometer
count value in registers 22h and 23h (fan maximum
TACH).
Fan 1 and 2 Configuration 2b (12h and 16h)
The following registers select the tachometer step sizes
and number of steps for step-size A to step-size B
slope changes (see Figure 1):
• D[7:4]: RPM (Tachometer) Step Size B. Selects
number of tachometer counts the target value
decreases for each temperature step increase after
the number of steps selected by D[3:0]. Value = n +
1 (1 through 16) where n is the value of D[7:4].
• D[3:0]: Selects the number of temperature/tachome-
ter steps above the fan-start temperature at which
step-size B begins.
Fan 1 and Fan 2 Configuration 3 (13h and 17h)
The following registers control fan spin-up, PWM output
frequency, pulse stretching, and THERM to fan full-
speed enable:
• D7: Fan Spin-Up Disable. Set to zero to enable fan
spin-up. Whenever the fan starts up from zero drive,
it is driven with 100% duty cycle for 2s to ensure that
it starts. Set to 1 to disable the spin-up function.
• D6:
THERM to Full-Speed Enable. When this bit is
1, THERM going low (either by being pulled low
externally or by the measured temperature exceed-
ing the THERM limit) forces the fan to full speed. In
all modes, this happens at the rate determined by
the rate-of-change selection. When THERM is
deasserted (even if the fan has not reached full
speed), the speed falls at the selected rate-of-
change to the target speed.
• D5: Disable Pulse Stretching. Pulse stretching is
enabled when this bit is set to zero. When modulat-
ing the fan’s power supply with the PWM signal, the
PWM pulses are periodically stretched to keep the
tachometer signal available for one full revolution.
Setting this bit to 1 disables pulse stretching. The
MAX6639 still measures the fan speed but does not
stretch the pulses for measurements, so the fan’s
power supply must not be pulse modulated.
• D[1:0]: PWM Output Frequency. These bits control
the PWM output frequency as shown in Table 9.
Fan Tach Count 1 and 2 (20h and 21h)
These registers have the latest tachometer measure-
ment of the corresponding channel. This is inversely
proportional to the fan’s speed. The fan RPM range
should be set so this count falls in the 30 to 160 range
for normal fan operation.
Fan Start Tach Count/Target Tach Count
(22h and 23h)
D[7:0]: This sets the starting tachometer count for the
fan in automatic RPM mode. Depending on the setting
of the minimum duty-cycle bit, the tachometer count
has this value either at all temperatures below the fan-
start temperature or the count is zero below the fan-
start temperature and has this value when the fan-start
temperature is reached. These registers are the target
tach count when in manual RPM mode.
2-Channel Temperature Monitor with Dual,
Automatic, PWM Fan-Speed Controller
______________________________________________________________________________________
15
REGISTER 11h
OR 15h
FAN CONTROL TEMPERATURE
STEP SIZE (
°C)
00
1
01
2
10
4
11
8
Table 8. Temperature Step Size
REGISTERS
13h AND 16h
LOW-FREQUENCY
(Hz) REGISTER
04h D3 = 0
HIGH-FREQUENCY
(kHz) REGISTER
04h D3 = 1
00
20
5
01
33.33
8.33
10
50
12.5
11
100
25
Table 9. Fan PWM Frequency


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