RPM-Based PWM Fan Controller
Datasheet
Chapter 2 Electrical Specifications
Table 2.1 Absolute Maximum Ratings
Voltage on 5V tolerant pins
(V
5VT_pin
)
Voltage on 5V tolerant pins
(|V
5VT_pin
- V
DD
|) (see
Voltage on VDD pin
Voltage on any other pin to GND
Package Thermal Resistance - Junction to Ambient (θ
JA
)
Operating Ambient Temperature Range
Storage Temperature Range
ESD Rating, All Pins, HBM
-0.3 to 5.5
0 to 3.6
-0.3 to 4
-0.3 to VDD + 0.3
141
-40 to 125
-55 to 150
2000
V
V
V
V
°C/W
°C
°C
V
Note:
Stresses above those listed could cause permanent damage to the device. This is a stress
rating only and functional operation of the device at any other condition above those indicated
in the operation sections of this specification is not implied.
Note 2.1
For the 5V tolerant pins that have a pull-up resistor, the pull-up voltage must not exceed
3.6V when the EMC2301 is unpowered.
2.1
Electrical Specifications
Table 2.2 Electrical Specifications
V
DD
= 3V to 3.6V, T
A
= -40°C to 125°C, all Typical values at T
A
= 27°C unless otherwise noted.
CHARACTERISTIC
SYMBOL
MIN
TYP
DC Power
MAX
UNIT
CONDITIONS
Supply Voltage
Supply Current
V
DD
I
DD
3
3.3
350
3.6
475
V
uA
PWM Fan Driver
PWM Resolution
PWM Duty Cycle
PWM
DUTY
0
256
100
RPM-based Fan Controller
Tachometer Range
Tachometer Setting
Accuracy
Input High Voltage
Input Low Voltage
TACH
480
±0.5
±1
2.0
0.8
16000
±1
±2
RPM
%
%
V
V
External oscillator 32.768kHz
Internal Oscillator
Steps
%
Δ
TACH
Δ
TACH
V
IH
V
IL
SMSC EMC2301
9
Revision 1.1 (10-12-09)
DATASHEET
SMSC [ SMSC CORPORATION ]
