EVB-EMC1033 SMSC, EVB-EMC1033 Datasheet - Page 8

• Manufacturer Part Number: EVB-EMC1033
• Description: MCU, MPU & DSP Development Tools Evaluation Board
• Manufacturer: SMSC

Specifications of EVB-EMC1033

• Processor To Be Evaluated: EMC1033
• Interface Type: USB
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Revision 1.1 (08-21-07)
4.4
4.5
4.6
4.7
4.8
Fan Driver
SMBus Alert Protocol (ARA) Support
Resistance Error Correction (R.E.C.)
Ideality Factor Correction
Anti-Parallel Diode (EMC1033 only)
Note: Asserting the
The fan driver utilizes the
speeds. See the Circuit Description above for information about the fan driver. Normally, the fan driver
is OFF. To turn the fan ON at low speed, the
caused by dragging the High Temp Limit line below the current temperature on the Zone Temperature
History graph, using the Register Manager to set the High Temp Limit value lower than the current
temperature or heating the temp sensor to exceed the limit.
To turn the fan ON to high speed, the
the current temperature exceeds the associated THERM limit.
Note: When
When the
will turn RED on the Register Manager panel. Press the Response button to cause RegMan to send
the SMBus Alert Address to the EMC1002/1033/1402 . The EMC1002/1033/1402 will respond with
it’s SMBus address which is displayed in a text box next to the Response button on the RegMan
interface. If the temperature is still above the limit, the indicator will remain lit and the
output will stay asserted. If the temperature is below the limit the indicator will turn OFF and the
Alert/Therm2
R.E.C. is normally enabled in the EMC1002/1033/1402 , however, for demonstration purposes this
evaluation board uses a special test mode to disable R.E.C. To show the R.E.C. feature, remove the
jumper on JP1 pins 1-2. This will insert a 100 ohm series resistor into the circuit and cause a
temperature reading error of approximately 60
to its correct reading. Now enable R.E.C. by entering the value 0x0c into R.E.C. configuration register
0x53. With R.E.C. enabled, the temperature will not change when the jumper is removed.
The Ideality Factor can be adjusted in Ideality Factor Registers 0x27 and 0x28 (EMC1033 only). These
registers will normally hold the default value which is correct for the diodes installed on the EVB.
Increasing or decreasing the value will cause a corresponding change in the temperature reading.
The EMC1033 supports an Anti-Parallel Diode (APD) configuration, where 2 diodes share the same
DP and DN lines but are in opposite polarity to each other. The Remote2 diode can be disconnected
from the circuit by removing one or both jumpers on JP1 pins 3-4 and 5-6. The APD function is
normally enabled on device power-up; the function can be disabled by writing a “1” to Configuration
Register 0x09, bit 0.
the fan driver circuit will pull down the
ARA Protocol will not function in this case.
Limit will cause it to assert, however the Low Temp Limit is ignored.
Alert/Therm2
output will de-assert.
Alert/Therm2
Addr
output is asserted an SMBus Alert interrupt is generated and an indicator light
/
Therm
is configured as a
Alert/Therm2
output low will also turn on the ARA LED on this EVB. This is because
Addr
and
8
/
Therm
Addr
Therm2
o
Alert/Therm2
Alert/Therm2
C. Replace the jumper and the temperature will return
/
Therm
output must be asserted low. This will occur when
output, temperatures exceeding the High Temp
outputs to drive a +5V fan to 3 different fan
EMC1002/EMC1033/EMC1402 EVB User Manual
output when
output must be asserted low. This can be
SMSC EMC1002/EMC1033/EMC1402
Addr
/
Therm
is low. The SMBus
Alert/Therm2