TC654 Datasheet, PDF (3/36 Pages) Microchip Technology – Dual SMBus™ PWM Fan Speed Controllers With Fan Fault Detection

TC654/TC655
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings *
V_DD..................................................................................6.5 V
Input Voltages .................................... -0.3 V to (V_DD + 0.3 V)
Output Voltages ................................. -0.3 V to (V_DD + 0.3 V)
Storage temperature .....................................-65°C to +150°C
Ambient temp. with power applied ................-40°C to +125°C
Maximum Junction Temperature, T_J ............................. 150°C
ESD protection on all pins ..................................................≥ 4 kV
*Notice: Stresses above those listed under “Maximum rat-
ings” may cause permanent damage to the device. This is a
stress rating only and functional operation of the device at
those or any other conditions above those indicated in the
operational listings of this specification is not implied. Expo-
sure to maximum rating conditions for extended periods may
affect device reliability.
ELECTRICAL SPECIFICATIONS
PIN FUNCTION TABLE
Name
V_IN
C_F
SCLK
SDA
GND
FAULT
SENSE2
SENSE1
V_OUT
V_DD
Function
Analog Input
Analog Output
Serial Clock Input
Serial Data In/Out (Open Drain)
Ground
Digital (Open Drain) Output
Analog Input
Analog Input
Digital Output
Power Supply Input
Electrical Characteristics: Unless otherwise noted, all limits are specified for V_DD = 3.0 V to 5.5 V,
-40°C <T_A < +85°C.
Parameters
Sym
Min
Typ
Max Units
Conditions
Supply Voltage
Operating Supply Current
Shutdown Mode Supply Current
V_OUT PWM Output
V_OUT Rise Time
V_OUT Fall Time
Sink Current at V_OUT Output
Source Current at V_OUT Output
PWM Frequency
V_DD
3.0
—
5.5
I_DD
—
150
300
I_DDSHDN
—
5
10
t_R
—
—
50
t_F
—
—
50
I_OL
1.0
—
—
I_OH
5.0
—
—
F
26
30
34
V_IN Input
V_IN Input Voltage for 100% PWM
duty-cycle
V_C(MAX) 2.45
2.6
2.75
V_C(MAX) - V_C(MIN)
V_IN Input Resistance
V_IN Input Leakage Current
SENSE Input
V_CRANGE
I_IN
1.25
—
-1.0
1.4
10M
—
1.55
—
+1.0
SENSE Input Threshold Voltage with V_THSENSE 80
100
120
Respect to GND
FAULT Output
FAULT Output LOW Voltage
FAULT Output Response Time
Fan RPM-to-Digital Output
V_OL
—
—
0.3
t_FAULT
—
2.4
—
Fan RPM ERROR
-15
—
+15
Note 1: Not production tested, ensured by design, tested during characterization.
2: For 5.0 V > V_DD ≤ 5.5 V, the limit for V_IH = 2.2 V.
V
µA Pins 7, 8, 9 Open
µA Pins 7, 8, 9 Open
µsec
µsec
mA
mA
Hz
I_OH = 5 mA, Note 1
I_OL = 1 mA, Note 1
V_OL = 10% of V_DD
V_OH = 80% of V_DD
C_F = 1 µF
V
V
Ω V_DD = 5.0 V
µA
mV
V I_OL = 2.5 mA
sec
% RPM > 1600
 2002 Microchip Technology Inc.
DS21734A-page 3