115
Rigel-PJ1nx Training
Slide 115
MM PWB
Power Circuit
The MM PWB operates on an indep6.2V power supply fed from Pins
1~5 and 36~40 of POMM2 (70-pin connector). This +6.2V power changes its
voltage between 5.4V and 8.0V according to the operating conditions of the PJ.
IC9001: 5V regulator IC (Power supply for VBUS (5V) of USB)
IC9005: 3.3V regulator IC (Power supply for USB-PHY, USB-HUB, LAN-PHY)
IC9002: 5V regulator IC (Pre-stage of IC9013)
IC9013: 3.6V regulator IC (To be fed to IC9008)
IC9006: 5V regulator IC (Power supply for ITC)
IC9008: PMIC (Generation of various power supplies for the CPU)
IC9001, IC9002, and IC9013 are ON/OFF-controlled by the MM_PWON signal
from the Main PWB.
In other words, when the MM_PWON signal is at “L ”level, the power supply for
the MM PWB assumes the OFF state. In this case, however, the power IC
(IC9006)for the RTC is always ON.
IC9005 and IC9013 are the regulator ICs of the voltage-variable type. Their
output voltages are set with the externally mounted resistors. (IC9005: Set at
3.3V output, IC9013: Set at 3.6V output)
The Power IC of IC9008 is an exclusive power IC for the CPU. It is an
independent 3.6V power supply and various power voltages for the CPU are
generated according to the startup sequence (order to start power supplies).
When this circuit is started, the reset signal output to the CPU and the
32.768kHz clock signal for CPU bootstrapping are generated.
