ADA4355ABCZ datasheet(39/45 Pages) AD

39 / 45 page

Data Sheet

ADA4355

Rev. A | Page 39 of 45

MEMORY MAP REGISTER TABLE

The ADA4355 uses a 3-wire interface and 16-bit addressing.

Therefore, Bit 0 and Bit 7 in Register 0x00 are set to 0, and Bit 3

and Bit 4 are set to 1.

When Bit 5 in Register 0x00 is set high, the SPI enters a soft

reset, where all of the user registers revert to their default

values, and Bit 2 is automatically cleared.

Table 17. Memory Map Register

Reg.

(Hex)

Bit 7 (MSB)

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0 (LSB)

Default

Value

(Hex)

Comments

Chip Configuration Registers

0x00

SPI port

configuration

0 = SDO

active

LSB first

Soft

reset

1 = 16-bit

address

1 = 16-bit

address

Soft reset

LSB first

0 = SDO

active

0x18

Nibbles are

mirrored to

allow a given

to perform

the same

function for

either MSB-

first or LSB-

first mode.

0x01

Chip ID

(global)

8-bit chip ID, Bits[7:0], ADA4355

0x8B

Unique chip

ID used to

differentiate

devices; read

only.

Device Index and Transfer Registers

0x05

Device index

Open

Clock

channel

DCO

Clock

channel

FCO

Open

01 = data channel

enabled,

00 = data channel

disabled,

Bit 1 only used after start

up or power cycle, see

ADC SPI Start-Up

Sequence

0x33

Bits are set to

determine

which

channels will

receive the

next write

command.

Bit 1 is only

used after

start-up or

power cycle.

0xFF

Transfer

Open

Initiate

override

0x00

Set

resolution/

sample rate

override.

Global ADC Function Registers

0x08

ADC power

modes (global)

Open

Power mode:

00 = chip run,

01 = full power-down,

10 = standby,

11 = reset

0x00

Determines

various

generic

modes of chip

operation.

0x09

Clock (global)

Open

DCS:

0 = off,

1 = on

0x00

Turns DCS

on or off.

0x0B

Clock divide

(global)

Open

Clock divide ratio[2:0]:

000 = divide by 1

001 = divide by 2

010 = divide by 3

011 = divide by 4

100 = divide by 5

101 = divide by 6

110 = divide by 7

111 = divide by 8

0x00

Not

applicable.

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