Motorola A008 Service Manual download pdf (Page 55)

Motorola Internal Use 12

A008 / A6188+ – Circuit Description

then switches the Multiplexer from the output of Y200 to the CR230 output. A high

will switch to 13MHz.

Logic: SIM Card Interface

1) Once powered up, the SIM card is interrogated. The SIM interface is part of the

Whitecap U800 and it supports both ‘synchronous’ (Prepay card) and asynchronous,

serial data transmission, though the A008 is programmed only for asynchronous.

VSIM1 (SIM_VCC) is originally programmed to 3V but if the card is 5V then the

SIM card will be powered down and VSIM1 will be reprogrammed to 5V The

Whitecap interprets that the card is 5V if after programming with 3V, it cannot read

any data from the card. The signal levels for in and out of the SIM are now required

to be level shifted within GCAP II U900 to 3V these signals are:

• Reset (Whitecap Pin E9 – RST0) in to GCAP II Pin E9 – LS1_IN_TG1A. This

signal is then level shifted to the required voltage and fed out to SIM Contacts J900

Pin 4 from Pin J7 - LS1_OUT_TG1A.

• Clock: This is a 3.25MHz signal from Whitecap – CLK0 Pin E7 to GCAP II Pin G6

– LS2_IN. This signal is then level shifted to the required voltage and fed out to SIM

Contacts J900 Pin 6 from Pin F6 – LS2_OUT.

• SIM I/O – Data transmission to and from SIM card; for TX, from SIM card contact

SIM I/O Pin 5 through to GCAP II Pin J8 SIM I/O. Through level shifter to desired

voltage and out through Pin K10 (LS3_TX_PA_B+) to Whitecap Pin F3 DAT0_TX.

For RX data from Whitecap Pin B5 DATA0_RX to GCAP II, Pin H8 – LS3_RX

where the signal is level shifted to desired voltage and outputted on Pin J8 SIM I/O

to SIM contacts Pin 5 SIM I/O.

• SIM_PD – This signal is provided by the signal THERM (Batt Contact J610), or by

BATT+. If there are no batteries present then the unit will display ‘Insert Battery’. If

batteries are present but the SIM card is either not inserted or faulty ‘! NO SIM

CARD ‘ will be displayed. The reason behind this is to prevent the extra cost of a

13MHz

Phase 1

Multiplexer

Y230

26MHz

CR230

Phase

Detector

Phase 2

PLL

Error Voltage

13MHz Output

to Whitecap

200kHz

130

MAGIC IC

U913

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Motorola A008 Service Manual Page 55

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