Block diagram
UM1015
10/38
Doc ID 18124 Rev 1
2.0.6 Real
time
clock (battery powered)
The real time clock (RTC) is powered by an external battery (3V) in order to prevent data
loss even if the main power supply is switched off.
2.0.7
General power supply
From a 5 V external AC/DC regulator power source, this block generates all the required
voltages as follows:
●
1.2V (Switching regulator PM6641) to supply the internal logic of the SPEAr320 MPU
●
1.8V (Switching regulator PM6641) for the DDR2 memory
●
2.5V (LDO regulator) for the analog portion of SPEAr320
●
3.3V (Switching regulator PM6641) to supply the other interfaces
A power monitor is also present to provide the general reset of the board.
2.0.8 Reset
button
A manual reset button (P1) on the top of the board (see
Figure 14 on page 31
) resets the
microprocessor on the core board.
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