SMBus Fan Control with 1°C Accurate Temperature Monitoring
Datasheet
Chapter 2 Pin Layout
2.1
Pin Diagram for EMC2101
VDD
DP
DN
FAN
1
2
3
4
EMC2101
8
7
6
5
SMCLK
SMDATA
ALERT / TACH
GND
Figure 2.1 EMC2101 Pinout
2.2
Pin Description for EMC2101
Table 2.1 Pin Description
PIN
1
2
3
4
NAME
VDD
DP
DN
FAN
FUNCTION
3.3V Power supply
External diode positive (anode)
connection
External diode negative (cathode)
connection
PWM Output
(default - software programmed)
DAC Output
software programmed
Power
Analog Input
Analog Input
TYPE
Open Drain Output (5V)
Analog Output
Power
Open Drain Output (5V)
5
6
GND
ALERT / TACH
Ground
ALERT - Open drain I/O operates as
active low interrupt or TACH input -
requires pull-up resistor, which defines
auto-configuration mode (see
TACH - TACH input
Digital Input (5V)
Digital Input / Open-Drain Output
(5V)
Digital Input / Open-Drain Output
(5V)
7
8
SMDATA
SMCLK
SMBus Data input/output
SMBus Clock input
Note:
All pins labelled with (5V) are 5V tolerant.
Revision 2.53 (03-13-07)
8
SMSC EMC2101
DATASHEET
SMSC [ SMSC CORPORATION ]
