User Guide

NPM-10 (3595)

System Module CC Technical Documentation

Sleep Mode

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

controlled by both processors. When SLEEPX low signal is detected, the UEM enters

SLEEP mode. VCORE, VIO, and VFLASH1 regulators are put into low quiescent current

mode. All RF regulators, except VR2, are disabled in SLEEP. When SLEEPX=1 is detected,

the 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

connection, etc.

In sleep mode, the main oscillator (26 MHz) is shut down and the 32 kHz sleep clock

oscillator is used as reference clock for the baseband.

Charging

Charging can be performed in parallel with any other operating mode. A BSI resistor

inside the battery pack indicates the battery type/size. The resistor value corresponds to

a specific battery capacity and technology.

The battery voltage, temperature, size, and current are measured by the UEM, controlled

by the charging software running in the UPP.

The charging control circuitry (CHACON) inside the UEM controls the charging current

delivered from the charger to the battery. The battery voltage rise is limited by turning

the UEM switch off when the battery voltage has reached VBATLim (programmable

charging cut-off limits 3.6 V / 5.0 V / 5.25 V). Charging current is monitored by

measuring the voltage drop across a 220 mOhm resistor.

Charging is controlled by the UEM ASIC. The external components are mounted for EMC,

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

charger connection is through the system connector interface. Both 2- and 3-wire type

chargers are supported.

VR2 Controlled by register writing; enabled in sleep mode

VR3 Enabled; disabled in sleep mode

VR4 Not used in NPM-10 (3595); must be kept disabled

VR5 Enabled; disabled in sleep mode

VR6 Enabled; disabled in sleep mode

VR7 Enabled; disabled in sleep mode

IPA1-2 Not used in NPM-10 (3595), must be kept disabled

Table 19: Regulator Controls (Continued)

Regulator Notes