Preliminary Technical Information

AD6426

This Information applies to a product under development. Its characteristics and specifications are subject to change without notice. Analog Devices assumes no

obligation regarding future manufacture unless otherwise agreed to in writing. No responsibility is assumed by Analog Devices for its use; nor for any

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rights of Analog Devices.

Revision Preliminary 2.3 (June 9, ´98)

- 17 -

Confidential Information

The EEPROM interface is controlled entirely through software

via the EEPROM register. This allows support for every

desired timing and protocol.

Bit

EEPROM CC Control Register 8

4

EEPROM Data Output Enable

when set to 1, the content of bit 0 will be written to

the pin.

2

EEPROM Clock

Connected to the EEPROMCLK pin

1

EEPROM Enable

Connected to the EEPROMENABLE pin

0

EEPROM Data

Connected to the EEPROMDATA pin

SIM Interface

The AD6426 allows direct interfacing to the SIM card via a

dedicated SIM interface. This interface consists of 7 pins as

shown in Table 7. Some applications may not require

SIMPROG and SIMCARD; thus SIMPROG and SIMCARD

can be re-used as additional general purpose I/O-pins.

Table 7. SIM Interface

Name

I/O

Function

SIMCARD

I

SIM card detect

SIMDATAOP

O

SIM data output

SIMDATAIP

I

SIM data input

SIMCLK

O

SIM clock

SIMRESET

O

SIM reset

SIMPROG

O

SIM program enable

SIMSUPPLY

O

SIM supply enable

Accessory Interface

The AD6426 provides 12 interface pins listed in Table 8 for

control of peripheral devices such as a car kit. However, two

general purpose I/O-pins of the Accessory Interface are

proposed to be used for additional control of the radio section

as described in the Radio Interface chapter.

Table 8. Accessory Interface

Name

I/O

Function

GPIO9:0

I/O

General purpose

inputs/outputs

GPCS

O

General purpose chip select

All GPIO pins start up as inputs. GPIO8 and GPIO9 are

controlled by flags in CC Control Register 79. When the

GPIOn OP Enable flag is set to 0, the GPIOn Data flag

reflects the input pin state when read and writing to GPIOn

Data has no effect.

When the GPIOn OP Enable flag is set to 1, the GPIOn Data

flag returns when read the last value written to it and controls

the GPIOn pin when written to it.

Additional general purpose inputs and outputs are available

under software control. The following pins shown in Table 9

become general purpose inputs/outputs or outputs.

Table 9. Additional GPIO / GPO Pins

Pin Name

I/O

New Function

SIMCARD

I/O

GPIO16

SIMPROG

I/O

GPIO15

ADD20

O

GPO10

FLASHPWD

O

GPO11

TXPA

O

GPO12

CALIBRATERADIO

O

GPO13

TXENABLE

O

GPO14

SYNTHEN1

O

GPO17

AGCA

O

GPO18

AGCB

O

GPO19

USCRI

O

GPO20

USCRTS

O

GPO21

USCCTS

I

GPI22

If the pins SIMCARD and SIMPROG are not required in the

application, they can be used as additional H8 programmable

general purpose inputs or outputs.

Setting GPO10 Select (CC Control Register 7) to 1, will

transform the pin ADD20 into a general purpose output

allowing the pin to be directly controlled via GPO10 Data.

By setting GPO11 Select (CC Control Register 77) to 1 and

FLASHPWD Disable to 1, the pin FLASHPWD becomes a

general purpose output. The pin state is toggled by setting the

GPO11 Data flag.

To increase the flexibility of the AD6426, three pins in the

Radio Interface are multiplexed within GPO functions. The

pins multiplexed are: SYNTHEN1, AGCA and AGCB, with

the default function being the Radio Interface. The mode of

these pins is controlled by the Channel Codec Register

ccGPO.

The GPO[n]Sel bit selects the function of the pin. Setting

GPO[n]Sel to one will enable the pin to be controlled by the

GPO[n] bit. The GPO[n]Sel bit will override any other pin

function selection.