Chapter 3 | Hardware |
Miscellaneous
Real Time Clock (RTC)
The MightyBoard 821 contains a Real Time Clock (RTC). The CMOS RAM is backed up with a Lithium Battery. If the battery is not present, the BIOS has a
External Battery (BT1)
An external battery input connection is provided through the battery connector (BT1) for an external battery. The external battery is used to power the Real Time Clock. Ampro provides a small Lithium Battery, taped to the Super I/O (U5) with adhesive tape, and connected to the external battery connection (BT1). This small external Lithium battery serves as an
Temperature Monitoring
The Super I/O chip (W83627HF) performs the temperature monitoring function. The inputs to the Super I/O chip come from the thermal diode in the Intel Celeron M or Pentium M CPU and a single thermistor (RT2) on the underside of the MightyBoard near pin 4 of the Infrared (IrDA) connector (J7).
NOTE The MightyBoard 821 requires a heatsink with a fan for both CPU versions (Intel Celeron M or Pentium M) and the Memory Hub (Northbridge).
User GPIO Signals (J8)
The MightyBoard 821 provides ten GPIO pins, including power and ground, for custom use, and the signals are routed to the J8 connector. Enable and initialize values are set in the BIOS. An example of how to use the GPIO pins resides in the Miscellaneous Source Code Examples on the MightyBoard 821 Support Software DVD.
The example program can be built by using the make.bat file. This produces a
Table
Pin # | Signal | Description |
1 | GND | Ground |
2 | VCC | +5 Volts DC |
|
|
|
3GP14 User defined
4GP15 User defined
5GP16 User defined
6GP17 User defined
7GP10 User defined
8GP11 User defined
9GP12 User defined
10GP13 User defined
Note: The shaded area denotes power or ground.
MightyBoard 821 | Reference Manual | 25 |
