EVB-EMC2101 User Manual
3.9.3Remote Diode
The remote diode on board the EMC2101 EVB has a heater and an optional in-line series resistance adjustment. Checking the REC feature of the EMC2101 is accomplished by removing the jumper on JP7. This adds 100 ohms of series resistance to the DN line of the diode connection. To return to 0 ohm series resistance, replace the jumper on JP7.
To heat the diode, place a jumper on JP10. To return to ambient conditions, remove JP10. These remote diode options are summarized in Table 3.4 below.
Table 3.4 Remote Diode Settings
JUMPER | NAME | OPEN | SHORT |
| | | |
JP7 | REC | Q11 - 100 ohms in | Q11 - 0 ohms in |
| | DN line (diode remote -) | DN line (diode remote -) |
| | | |
JP13 | REC | Q12 - 100 ohms in | Q12 - 0 ohms in |
| | DN line (diode remote -) | DN line (diode remote -) |
| | | |
JP10 | HEATER | Ambient temp on remote diode | 1.0W resistive heater on remote diode (Q12) |
| | (Q12) | |
| | | |
This EVB also allows for an off-board diode to be tested (see Table 3.5). This is done by removing both jumpers on JP8. Then connect Pin 1 to the ‘remote+’ terminal of the remote diode and Pin 3 to the ‘remote-‘ terminal of the remote diode. Make sure a common ground exists between the remote diode (GPU, etc.) and the EMC2101 EVB. Also ensure that the remote diode is properly biased according to the diode manufacture.
Table 3.5 Remote Diode Configurations
CONFIGURATION | JUMPER | PIN 1 | | PIN 2 | PIN 3 | | PIN 4 |
| | | | | | | |
On-board diode (Q11) | JP9 | short / DP | | short / DN | |
| | | | | | |
Off-board diode (CPU, | JP9 | remote + / DP | | open | remote - / DN | | open |
GPU, etc.) | | | | | | | |
| | | | | | | |
On-board diode (Q12) | JP12 | short / DP | | short / DN | |
| | | | | | |
Off-board diode (CPU, | JP12 | remote + / DP | | open | remote - / DN | | open |
GPU, etc.) | | | | | | | |
| | | | | | | |
A unique feature of the EMC2101-R device is the ability to start in one of several different configurations based on the pull up resistor on the ALERT output. The EVB allows the user to quickly evaluate each of the 4 configurations by adjusting JP11 as shown in Table 3.6. When using the auto load via EEPROM, ensure that the Autorefresh Registers is not selected until the loading is complete (less than 1 sec).
Revision 1.5 (12-13-06) | SMSC EMC2101 |