Multiple RPM-Based PWM Fan Controller for Five Fans
Datasheet
Chapter 1 Pin Description
16 TACH5
14 TACH4
15 PWM5
SMDATA 1
SMCLK 2
VDD 3
ADDR_SEL 4
5
6
7
8
TACH2
EMC2305
16-QFN
13 PWM4
12 ALERT#
11 CLK
10 TACH3
9 PWM3
PWM1
Figure 1.1 EMC2305 Pin Diagram (16-Pin QFN)
Table 1.1 Pin Description for EMC2305
PIN NUMBER
1
2
3
4
PIN NAME
SMDATA
SMCLK
VDD
ADDR_SEL
PIN FUNCTION
SMBus data input/output - requires
external pull-up resistor
SMBus clock input - requires external
pull-up resistor
Power Supply
Address selection input - requires pull-up
resistor
Push-Pull PWM output driver for Fan 1
5
PWM1
Open Drain PWM output driver for Fan 1
OD (5V)
PIN TYPE
DIOD (5V)
DI (5V)
Power
AIO
DO
SMSC EMC2305
TACH1
7
PWM2
Revision 1.1 (10-12-09)
DATASHEET
SMSC [ SMSC CORPORATION ]
