Nokia RM-42 Service Manual page 429

RM-42
System Module
Mode Description
SLEEP SLEEP mode is entered only from PWR_ON mode with the aid of SW when the system's
activity is low. There are in principle three different sleep modes:
• OMAP1710 sleep
• RAP3G sleep
• OMAP and RAP3G sleep (deep sleep)
In SLEEP mode RETU's regulators VIO, VDRAM, VSIM1, VSIM2, VAUX and Vana are in low
quiescent current mode (output voltages still present but regulators will not give as much
current out). Other regulators including VR1 supplying system clock oscillator are
disabled.
In SLEEP mode, TAHVO VCORE SMPS regulator is in low quiescent current mode (if sleep
mode is not internally disabled). Linear regulator VOUT state depends on the accessory
connected to the system connector (Pop-Port), if there is any.
FLASHING FLASHING mode is for SW downloading. FLASHING mode is not really a RETU or TAHVO
state but rather a system state. From RETU and TAHVO point of view, it is like PWR_ON.
The state is entered from PWR_ON. It is possible to use external voltage (VPP) during
flashing to speed up the process (provided that the memory components support the
feature).
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