EVB-EMC2300 SMSC, EVB-EMC2300 Datasheet - Page 5

• Manufacturer Part Number: EVB-EMC2300
• Description: MCU, MPU & DSP Development Tools Evaluation Board
• Manufacturer: SMSC

Specifications of EVB-EMC2300

• Processor To Be Evaluated: EMC2300
• Interface Type: USB
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

EVB-EMC2300 User Manual
SMSC EVB-EMC2300
3 Circuit Description
3.1
3.2
3.3
3.4
3.5
Introduction
EMC2300
USB to SMBus Bridge
SMBus Address Selection
Remote Diodes and Zone Heaters
The following section describes the EVB hardware circuits which demonstrate the EMC2300 features.
Detailed information on the hardware can be found on the schematic included on the distribution CD.
The EMC2300 is a fan control IC capable of driving up to 3 fans and monitoring the speed of up to 4
fans. Fan control can be either automatic, based on 1 or more monitored temperature zone or driven
manually by a host controller. Up to 3 temperature zones and 5 voltages can also be monitored. All
monitored values have associated limit registers that can be enabled to cause assertion of the interrupt
pin (
The USB to SMBus bridge is based on an 8051 microcontroller with integrated USB and SMBus
interfaces as well as internal flash and RAM. During EVB manufacture, firmware is loaded into the
bridge that provides the interface between the SMBus and the USB driver. Power is sourced to the
MCU from the USB interface.
The SMBus address is selected based on the JP2 jumper positions which strap the TACH4/Address
Select and PWM3/
selected when both pins are pulled up to +3.3V. Pulling pin13 (PWM3/ADDREN#) low enables
selection of alternate addresses. See the “Jumper Settings and Connector List for EMC2300 Customer
EVB” document or the schematic for details.
Note: Selecting alternate addresses disables PWM3/
The EVB-EMC2300 has 2 on-board temperature sensing diodes, which are 2N3904 transistors in a
diode-connected configuration. Each diode has an associated “zone” heater; this is a power resistor
that is thermally bonded to the temperature sensing diode. When enabled, the power resistors will
increase the diode temperature by 15-30degC; the resistor associated with Zone 1 has a greater
heating capacity than the Zone 2 resistor to allow more complex evaluation of the multi-zone control
algorithm.
To activate the heaters, move the jumpers on JP4 from their storage locations to the “enabled”
positions. See the “Jumper Settings and Connector List for EMC2300 Customer EVB” document or the
schematic for details.
The on-board thermal diodes may be disconnected by removing the jumpers on JP5 (remote 1) or JP6
(remote 2). Disconnecting the on-board thermal diodes permits connection of external temperature
sensing diodes to JP5, 6, 9 or 10. See the “Jumper Settings and Connector List for EMC2300
Customer EVB” document or the schematic for connection details.
Int
) if the values exceed programmed limits.
Select if it is strapped low.
Address Enable
pins either high or low. The default SMBus address, 010 1110, is
Address Enable
and will disable TACH4/Address
Revision 1.0 (12-14-06)