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MIC502YN Datasheet(PDF) 9 Page - Micrel Semiconductor

Part # MIC502YN
Description  Fan Management IC
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Manufacturer  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MIC502YN Datasheet(HTML) 9 Page - Micrel Semiconductor

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Micrel, Inc.
MIC502
November 2006
9
M9999-112206
Functional Description
Oscillator
A capacitor connected to CF determines the frequency
of the internal time base which drives the state-machine
logic and determines the PWM frequency. This operating
frequency will be typically 30Hz to 60Hz. (CF = 0.1µF for
30Hz.)
Pulse-Width Modulator
A triangle-wave generator and threshold detector
comprise the internal pulse-width modulator (PWM). The
PWM’s output duty-cycle is determined by the higher of
VT1 or VT2. A typical voltage range of 30% to 70% of VDD
applied to the V T1 and V T2 pins corresponds to 0% to
100% duty-cycle. Since at least one of the control
voltage inputs is generally from a thermistor-resistor
divider connected to VDD, the PWM out-put duty cycle
will not be affected by changes in the supply voltage.
Driver Output
OUT is a complementary push-pull digital output with
asymmetric drive (approximately 10mA source, 1mA
sink, see “Electrical Characteristics”). It is optimized for
directly driving an NPN transistor switch in the fan’s
ground-return. See “Applications Information” for circuit
details.
Shutdown/Reset
Internal circuitry automatically performs a reset of the
MIC502 when power is applied. The MIC502 may be
shut down at anytime by forcing VT1 below its VIL
threshold. This is typically accomplished by connecting
the VT1 pin to open-drain or open-collector logic and
results in an immediate and asynchronous shutdown of
the MIC502. The OUT and /OTF pins will float while V T1
is below VIL.
If V T1 then rises above VIH, a device reset occurs. Reset
is equivalent to a power-up condition: the state of /OTF
is cleared, a startup interval is triggered, and normal fan
operation begins.
Startup Interval
Any time the fan is started from the off state (power-on
or coming out of sleep mode or shutdown mode), the
PWM output is automatically forced high for a startup
interval of 64× tPWM. Once the startup interval is
complete, PWM operation will commence and the duty-
cycle of the output will be determined by the higher of
VT1 or VT2.
Overtemperature Fault Output
/OTF is an active-low, open-collector logic output. An
over-temperature condition will cause /OTF to be
asserted. An overtemperature condition is determined by
VT1 exceeding the normal operating range of 30% to
70% of VDD by > 7% of VDD. Note that VOT is guaranteed
by design to always be higher than VPWM(max).
Sleep Mode
When VT1 and VT2 fall below VSLP, the system is deemed
capable of operating without fan cooling and the MIC502
enters sleep mode and discontinues fan operation. The
threshold where the MIC502 enters sleep mode is deter-
mined by VSLP. Connecting the VSLP pin to ground
disables sleep mode.
Once in sleep mode, all device functions cease (/OTF in-
active, PWM output off) unless VT1 or VT2 rise above
VWAKE. (VWAKE = VSLP + VHYST). VHYST is a fixed amount of
hysteresis added to the sleep comparator which
prevents erratic operation around the VSLP operating
point. The result is stable and predictable thermostatic
action: whenever possible the fan is shut down to reduce
energy consumption and acoustic noise, but will always
be activated if the system temperature rises.
If the device powers-up or exits its reset state, the fan
will not start unless VT1 or VT2 rises above VWAKE.
System Operation
Power Up
• A complete reset occurs when power is applied.
• OUT is off (low) and /OTF is inactive (high/floating).
• If VT1 < VIL, the MIC502 remains in shutdown.
• The startup interval begins. OUT will be on (high) for
64 clock cycles (64 × tPWM).
• Following the startup interval, normal operation
begins.
Reset Startup Timer;
Deassert /OTF;
OUT Off (Low)
.
VT1 >VOT
?
POWER ON
VT1 <VIL
?
NO
NO
OUT Held On (High)
During Startup
Interval.
Startup Interval
Finished
?
Deassert OUT
(OUT = Low)
YES
NO
Assert /OTF While
VT1 >VOT
NORMAL
OP ERATION
YES
YE S
Figure 3. Power-Up Behavior


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