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Remote-Junction Temperature-Controlled
Fan-Speed Regulator with SMBus Interface
Table 7. POR Slave Address Decoding
Power-up defaults include:
(ADD0 and ADD1)
?
?
Interrupt latch is cleared.
ADC begins autoconverting.
ADD0
GND
GND
GND
High-impedance
ADD1
GND
High-impedance
V CC
GND
ADDRESS
0011 000
0011 001
0011 010
0101 001
?
?
?
Command register is set to 00h to facilitate quick
internal Receive Byte queries.
T HIGH and T LOW registers are set to +127°C and
-55°C, respectively.
T HYST and T MAX are set to +95°C and +100°C,
High-impedance
High-impedance
V CC
V CC
V CC
High-impedance
V CC
GND
High-impedance
V CC
0101 010
0101 011
1001 100
1001 101
1001 110
respectively.
Fan Control
The fan-control function can be divided into the thermal
loop, the fan-speed-regulation loop (fan loop), and the
fan-failure sensor. The thermal loop sets the desired fan
speed based on temperature while the fan-speed-regu-
lation loop uses an internally divided down reference
oscillator to synchronize to and regulate the fan speed.
The fan-speed-regulation loop includes the fan driver
and the tachometer sensor. The fan-failure sensor pro-
TEMPDATA
FCR
0.25s TO 16s
UPDATE
T FAN
FSC
FG
4/5/6 BITS
FAN CONTROL
DRIVER CIRCUIT
Figure 6. MAX6660 Thermal Loop
vides a FAN FAIL alarm that signals when the fan
tachometer count is greater than the fan tachometer
value, which corresponds to a fan going slower than
the limit. The fan driver is an N-channel, 4 ? , 320mA
MOSFET with a 16V maximum V DS whose drain termi-
nal connects to the low side of the fan. The tachometer
sensor (TACH IN) of the MAX6660 is driven from the
tachometer output of the fan and provides the feed-
back signal to the fan-speed-regulation loop for control-
ling the fan speed. For fans without tachometer outputs,
the MAX6660 can generate its own tachometer pulses
by monitoring the commutating current pulses (see
Commutating Current Pulses section).
Thermal Loop
Thermal Closed Loop
The MAX6660 can be operated in a complete closed-
loop mode, with both the thermal and fan loops closed,
where the remote-diode sensor temperature directly
controls fan speed. Setting bit 3 of the Configuration
register to zero places the MAX6660 in thermal closed
loop (Figure 6). The remote-diode temperature sensor
is updated every 250ms. The value is stored in a tem-
porary register (TEMPDATA) and compared to the pro-
grammed temperature values in the T HIGH , T LOW ,
T HYST , T MAX , and T FAN registers to produce the error
outputs OVERT and ALERT .
The Fan Conversion Rate (FCR) register (Table 8) can
be programmed to update the TEMPDATA every 0.25s
14
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