User Guide

Figure 110 ALS HW implementation

Table 17 ALS resistor values

Symbol R1 R2 R3 R4 R5 R6 R7 NTC-res

Value 5 kOhm 15 kOhm 30 kOhm 50 kOhm

470

kOhm

100

kohm

470

kohm 47 kOhm

ASICs

RAP3G ASIC

RAP3G ASIC is a 3G Radio Application Processor. RAM memory is integrated into RAP3G.

In general RAP3G consists of three separate parts:

• Processor subsystem (PSS) that includes the main processor and related functions

• MCU peripherals that are mainly controlled by MCU

• DSP peripherals that are mainly controlled by DSP

RAP3G core voltage (1.4V) is generated from Tahvo VCORE and I/O voltage (1.8V) is from Retu VIO. The core

voltage in sleep mode is lowered to 1.05V.

Retu EM ASIC

Retu EM ASIC includes the following functional blocks:

• Start up logic and reset control

• Charger detection

• Battery voltage monitoring

• 32.768kHz clock with external crystal

• Real time clock with external backup battery

• SIM card interface

• Stereo audio codecs and amplifiers

• A/D converter

• Regulators

• Vibra interface

• Digital interface (CBUS)

RM-42

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