User Guide

RH-30/RH-31 Company Confidential

System Module Nokia Customer Care

voltage can be programmed to be 2.78V or 3.3V. VR4 -VR7 can be enabled, disabled, or

forced into low quiescent current mode. VR3 is always enabled in Active mode.

Sleep Mode

Sleep mode is entered when both MCU and DSP are in stand–by mode. Sleep is con-

trolled by both processors. When SLEEPX low signal is detected UEM enters SLEEP mode.

VCORE, VIO and VFLASH1 regulators are put into low quiescent current mode. All the RF

regulators are disabled in SLEEP. When SLEEPX=1 detected UEM enters ACTIVE mode and

all functions are activated.

The sleep mode is exited either by the expiration of a sleep clock counter in the UEM or

by some external interrupt, generated by a charger connection, key press, headset con-

nection etc.

In sleep mode VCTCXOr is shut down and 32 kHz sleep clock oscillator is used as refer-

ence clock for the baseband.

Charging

Charging can be performed in any operating mode.

RH-30/RH-31 supports the standard NMP charger interface.

Supported chargers are ACP-7, ACP-8, ACP-12, LCH-12 and LCH-9.

Charging is controlled by the UEM ASIC and external components are needed for EMC,

reverse polarity and transient protection of the input to the baseband module. The

charger connection is through the system connector interface. The RH-30/RH-31 base-

band is designed to support DCT3 chargers from an electrical point of view. Both 2- and

3-wire type chargers are supported.

The operation of the charging circuit has been specified in such a way as to limit the

power dissipation across the charge switch and to ensure safe operation in all modes.

Battery

780 mAh Li-ion battery pack BLD-3 is used in RH-30/RH-31.

Description Value

Nominal discharge cut-off voltage 3.1V

Nominal battery voltage 3.6V

Nominal charging voltage 4.2V

Maximum charger output current 850 mA

Minimum charger output current 200 mA