Fan Control Device with High Frequency PWM and Temperature Monitors
Datasheet
Chapter 3 Pin Description
3.1
Pin Functions for EMC2300
Table 3.1 Pin Description
BUFFER
REQUIREMENT
BUFFER PER FUNCTION POWER
PIN #
NAME
FUNCTION
TYPE
(Note 3.1)
WELL
NOTES
HARDWARE MONITORING BLOCK (16)
1
SDA
System Management Bus bi-directional
Data. Open Drain output.
IMOD3
IMOD3
VCC
2
SCLK
System Management Bus Clock.
IM
IM
VCC
VCC
13
Remote1- This is the negative Analog input (current
sink) from the remote thermal diode. This
serves as the negative input into the A/D.
Digital Input.
IAN
IAN
14
11
Remote1+ This is the positive input (current source)
from the remote thermal diode. This serves
as the positive input into the A/D.
IAN
IAN
VCC
VCC
Remote2- This is the negative Analog input (current
sink) from the remote thermal diode. This
serves as the negative input into the A/D.
Digital Input.
IAN
IAN
12
15
Remote2+ This is the positive input (current source)
from the remote thermal diode. This serves
as the positive input into the A/D.
IAN
IAN
VCC
VCC
VCCP
Analog input for +Vccp (processor voltage:
0 to 3.0V).
IAN
IAN
Note 3.2
7
8
5
TACH1
TACH2
Input for monitoring a fan tachometer input.
Input for monitoring a fan tachometer input.
IM
IM
IM
IM
VCC
VCC
VCC
TACH3
/INT#
Input for monitoring a fan tachometer input. IMOD3
/Interrupt output to indicate a thermal
and/or voltage event.
IM /OD3
10
TACH4
/Address
Select
Input for monitoring a fan tachometer input.
If in Address Select Mode, determines the
SMBus address of the device.
IM
IM
VCC
16
6
PWM1
/xTest Out
PWM Output 1 controlling speed of fan.
When in XOR tree test mode, functions as
XOR Tree output.
O8
OD8/O8
OD8/OD8
OD8/I
VCC
VCC
VCC
PWM2
/INT#
PWM Output 2 controlling speed of fan.
/Interrupt output to indicate a thermal
and/or voltage event.
OD8
IOD8
9
PWM3
/Address
Enable#
PWM Output 3 controlling speed of fan.
If pulled to ground at power on, enables
Address Select Mode (Address Select pin
controls SMBus address of the device).
4
3
VCC
VSS
Positive Power Supply. Nominal 3.3V.
VCC is monitored by the Hardware
Monitoring Block.
(Can be powered by +3.3V Standby power
if monitoring in low power states is
required.)
Analog Ground.
Revision 0.2 (06-14-06)
SMSC EMC2300
DATA1S0HEET
SMSC [ SMSC CORPORATION ]
