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Table 8 shows the pin assignments and signal names for the front panel header. Table 8. Front Panel Header Signal Names Pin Description In/Out Pin Description In/Out Hard Drive Activity LED Power LED 1 Hard disk LED pull-up to +5 V Out 2 Front panel LED+ Out 3 Hard disk active LED Out 4 Front panel LED-Out Reset Switch On/Off Switch 5 Ground 6 Power switch In 7 Reset switch In 8 Ground Power Not Connected 9 Power (+5 V DC) Out 10 No pin NOTE When connecting individual wires from your chassis front panel to the front panel header, be sure to observe the connection polarity. Positive wires are usually solid color and negative wires are usually white or striped. Intel Desktop Board DN2800MT Product Guide Front Panel Audio Header The front panel audio header shown in Figure 11, F supports both Intel HD Audio and AC ’97 Audio. Table 9 shows the pin assignments and signal names for Intel HD Audio and Table 10 shows the pin assignments and signal names for AC ’97 Audio. Table 9. Front Panel Audio Signal Names for Intel HD Audio Pin Signal Name Pin Signal Name 1 PORT 1L (Microphone) 2 GND 3 PORT 1R (Microphone) 4 PRESENCE# 5 PORT 2R (Headphone) 6 SENSE1_RETURN 7 SENSE_SEND 8 KEY (no pin) 9 PORT 2L (Headphone) 10 SENSE2_RETURN Table 10. Front Panel Audio Header Signal Names for AC ’97 Audio Pin Signal Name Pin Signal Name 1 MIC 2 AUD_GND 3 MIC_BIAS 4 PRESENCE# 5 FP_OUT_R 6 AUD_GND 7 No Connection 8 KEY (no pin) 9 FP_OUT_L 10 AUD_GND Front Panel USB 2.0 Header Figure 11, G shows the location of the standard front panel dual-port USB 2.0 header and Table 11 shows the pin assignments and signal names. Table 11. Front Panel Dual-Port USB 2.0 Header Signal Names Pin Signal Name Pin Signal Name 1 Power (+5 V) 2 Power (+5 V) 3 D4 D5 D+ 6 D+ 7 Ground 8 Ground 9 Key (no pin) 10 No Connection Installing and Replacing Desktop Board Components Front Panel USB 2.0 Header (with Flash Drive Support) Figure 11, H shows the location of the standard front panel dual-port USB 2.0 header and Table 12 shows the pin assignments and signal names. Table 12. Front Panel Dual-Port USB 2.0 Header (with Flash Drive Support) Signal Names Pin Signal Name Pin Signal Name 1 Power (+5 V) 2 Power (+5 V) 3 D4 D5 D+ 6 D+ 7 Ground 8 Ground 9 Key (no pin) 10 LED# NOTE Computer systems that have an unshielded cable attached to a USB port might not meet FCC Class B requirements, even if no device or a low-speed USB device is attached to the cable. Use a shielded cable that meets the requirements for a full-speed USB device. DMIC Header Figure 11, I shows the location of the DMIC header. Table 13 shows the pin assignments and signal names for the DMIC header. Table 13. DMIC Header Signal Names Pin Description 1 3.3 V 2 DMIC_DATA 3 Ground 4 DMIC_CLK 5 Key (no pin) Intel Desktop Board DN2800MT Product Guide Custom Solutions Header Figure 11, J shows the location of the Custom Solutions header and Table 14 shows the pin assignments and signal names. Table 14. Custom Solutions Header Signal Names Pin Signal Name Pin Signal Name 1 WDTO# 2 Ground 3 No Connection 4 SMB_CLK_RESUME 5 +3.3 V 6 SMB_DATA_RESUME 7 PWRBT# 8 CEC Connecting a System Fan You can connect a 3-wire system fan cable to the system fan header on the Desktop Board as shown in Figure 12. Figure 12. Location of the Chassis Fan Header Installing and Replacing Desktop Board Components Connecting to a Power Supply The board supports a wide range of input voltages from either of the following power supply types: • External Power Supply – the board can be powered with an 8-19 V DC external power supply though the DC jack on the back panel (Figure 13, A). This connector accepts dual-barrel plugs with an inner diameter (ID) of 2.5 mm and an outer diameter (OD) of 5.5 mm, where the inner contact is +8 V DC (±10 %) through +19 V DC (±10 %) and the shell is Ground. The maximum current rating for this connector is 8 A. • Internal Power Supply – the board can alternatively be powered through the internal 1 x 2 power connector (Figure 13, B), where pin 1 is Ground and pin 2 is +8 V DC (±10 %) through +19 V DC (±10 %). The maximum current rating for this connector is 10 A. Use of an external power supply is preferred. Total power consumption depends on the system configuration selected by the integrator. Refer to the Intel Desktop Board DN2800MT Technical Product Specification for further guidance. Figure 13. Power Supply Connections Intel Desktop Board DN2800MT Product Guide CAUTION The external power jack is the primary power input connector of Intel Desktop Board DN2800MT. However, the Desktop Board also provides an internal 1 x 2 power connector that can used be with a target system that already has an internal power supply. There is no isolation circuitry between the external power jack and the internal 1 x 2 power connector. It is the system integrator’s responsibility to ensure that no more than one power supply unit is or can be attached to the board at any time and to ensure that the external power jack...