User Guide

Nokia Customer Care System Module

6015/6015i/6016i/6019i (RH-55), 6012 (RM-20)

RF Interface

In addition to the RF regulators mentioned, UEM handles the interface between the

baseband and the RF section. It provides A/D and D/A conversion of the in-phase and

quadrature receive and transmit signal paths, and also A/D and D/A conversions of

received and transmitted audio signals to and from the UI section. The UEM supplies the

analog AFC signal to the RF section according to the UPP DSP digital control. It also

converts PA temperature into real data for the DSP. The UPP controls the RFIC through

the 3-wire RFIC bus. UPP also provides PDM regulator for RF interface (RX/TX AGC

control).

Charging Control

The CHACON block of the UEM controls charging. Needed functions for charging controls

include: PWM-controlled battery charging switch, charger-monitoring circuitry, and

battery voltage monitoring circuitry. In addition, external components are needed for

EMC protection of the charger input to the baseband module. The DCT4 baseband is

designed to electrically support both DCT3 and DCT4 chargers.

Digital Interface

Data transmission between the UEM and the UPP is implemented using two serial

connections, DBUS (9.6 MHz) for DSP and CBUS (1.2 MHz in CDMA) for MCU. UEM is a

dual-voltage circuit: the digital parts are running from 1.8V and the analog parts are

running from 2.78V. Vbat (3.6V) voltage regulators inputs also are used.

Audio Codec

The baseband supports two external microphone inputs and one external earphone

output. The inputs can be taken from an internal microphone, from a headset

microphone, or from an external microphone signal source through a headset connector.

VIO Supplies both external and internal logic circuitries. This regulator is used by the LCD, flash, Bat-

man, Jupiter, GPS RF, GPS Baseband, and the UPP. The VIO regulator enters low Iq mode in sleep

mode.

VCORE Supplies the DSP, the core part of the UPP, and the GPS BB ASIC. The voltage is programmable

and the startup default is 1.35V. This regulator enters low Iq-mode in sleep mode.

VR1 (VR1A, VR1B) Uses two LDOs and a charge pump. VR1A is used in the UHF PLL, and VR1B is used

for Jupiter PLL.

VR2 Linear regulator used to supply the Jupiter RF ASIC.

VR3 Linear regulator used by the VCTCXO circuitry.

VR4 Linear regulator used by the UHF PLL and the UHF VCO.

VR5 Linear regulator used by the Batman and Alfred ASICs.

VR6 Linear regulator used by the Jupiter PLL.

VR7 Linear regulator used by the Batman ASIC.

Table 3: Regulator Descriptions (Continued)

Regulator Description