MIC502BM(1999) Ver la hoja de datos (PDF) - Micrel
Número de pieza
componentes Descripción
Fabricante
MIC502BM Datasheet PDF : 11 Pages
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MIC502
Pin Configuration
VT1 1
CF 2
VSLP 3
GND 4
8 VDD
7 OUT
6 OTF
5 VT2
8-Pin SOIC (M)
8-Pin DIP (N)
Micrel
Pin Description
Pin Number
1
2
3
4
5
6
7
8
Pin Name
VT1
CF
VSLP
GND
VT2
/OTF
OUT
VDD
Pin Function
Thermistor 1 (Input): Analog input of approximately 30% to 70% of VDD
produces active duty cycle of 0% to 100% at driver output (OUT). Connect to
external thermistor network (or other temperature sensor). Pull low for
shutdown.
PWM Timing Capacitor (External Component): Positive terminal for the
PWM triangle-wave generator timing capacitor. The recommended CF is
0.1µF for 30Hz PWM operation.
Sleep Threshold (Input): The voltage on this pin is compared to VT1 and VT2.
When VT1 < VSLP and VT2 < VSLP the MIC502 enters sleep mode until VT1 or
VT2 rises above VWAKE. (VWAKE = VSLP + VHYST.) Grounding VSLP
disables the sleep-mode function.
Ground
Thermistor 2 (Input): Analog input of approximately 30% to 70% of VDD
produces active duty cycle of 0% to 100% at driver output (OUT). Connect to
motherboard fan control signal or second temperature sensor.
Overtemperature Fault (Output): Open-collector output (active low).
Indicates overtemperature fault condition (VT1 > VOT) when active.
Driver Output: Asymmetical-drive active-high complimentary PWM output.
Typically connect to base of external NPN motor control transistor.
Power Supply (Input): IC supply input; may be independent of fan power
supply.
MIC502
164
May 1999
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