External Power Management (CN12)

An external power management connector (CN12) is available for external devices to wake the system from low power states. Some low power modes require that +5 V standby power is applied to the cpuModule during the wake event.

For more information on power management, including a description of the board’s supported wake options, refer to the Power Management section on page 73.

Table 35 External Power Management (CN12)

Pin

Signal

Function

 

 

 

1

+5V_STDBY

+5 V standby Power

 

 

 

2

GND

Ground

 

 

 

2

PME#

Power Management Event input

 

 

 

Optional RTC Battery Input (CN13)

The optional RTC battery input is the connection for an external backup battery. This battery is used by the cpuModule when system power is removed in order to preserve the date and time in the real time clock.

Connecting a battery is only required to maintain time when power is completely removed from the cpuModule. A battery is not required for board operation.

Table 36 Optional RTC Battery Input (CN13)

Pin

Signal

Function

 

 

 

1

BAT

RTC Battery Input

 

 

 

2

GND

Ground

 

 

 

WARNING This optional RTC battery connector (CN13) should be left unconnected if the utility port connector (CN5) has a battery connected.

Fan Power, +5 V (CN14)

If a fan is required to cool the cpuModule, it can be wired to CN14, which provides a continuous connection to +5 V and ground.

Table 37 Fan Power, +5 V (CN14)

Pin

Signal

Function

 

 

 

1

+5V

+5 Volts DC

 

 

 

2

GND

Ground

 

 

 

Note To utilize the thermal fan mode feature in the BIOS, the fan must be connected to CN15

BDM-610000049 Rev G

Chapter 3: Connecting the cpuModule 53

Page 63
Image 63
IBM BDM-610000049 user manual External Power Management CN12, Optional RTC Battery Input CN13, Fan Power, +5 V CN14

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