LTC2984 datasheet(15/78 Pages) AD

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LTC2984

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Table 2A. Memory Map

LTC2984 MEMORY MAP

SEGMENT

START

ADDRESS

END

ADDRESS

SIZE

(BYTES)

DESCRIPTION

Command Status Register

0x000

0x0000

See Table 6, Initiate Conversion, Sleep Command

Reserved

0x001

0x000F

Temperature Result Memory

20 Words – 80 Bytes

0x010

0x05F

See Tables 8 to 10, Read Result

Reserved

0x060

0x0AF

EEPROM Key

0x0B0

0x0B3

See Table 11

Reserved

0x0B4

0x0CF

EEPROM Read Result Code

0x0D0

See Table 11

Reserved

0x0D1

0x0EF

Global Configuration Register

0x0F0

Reserved

0x0F1

0x0F3

Measure Multiple Channels Bit Mask

0x0F4

0x0F7

See Tables 69, 70, Run Multiple Conversions

Reserved

0x0F8

EEPROM Status Register

0x0F9

See Table 12

Reserved

0x0FA

0x0FE

MUX Configuration Delay

0x0FF

See MUX Configuration Delay Section of Data Sheet

Reserved

0x100

0x1FF

256

Channel Assignment Data

0x200

0x24F

See Tables 3, 4, Channel Assignment

Custom Sensor Table Data

0x250

0x3CF

384

Reserved

0x3D0

0x3FF

OVERVIEW

Memory Map

The LTC2984 channel assignment, configuration, conver-

sion start, and results are all accessible via the RAM (see

Table 2A). Table 2B details the valid SPI instruction bytes

foraccessingmemory.Thechannelconversionresultsare

mapped into memory locations 0x010 to 0x05F and can be

read using the SPI interface as shown in Figure 1. A read is

initiated by sending the read instruction byte = 0x03

followed by the address and then data. Channel assign-

ment data resides in memory locations 0x200 to 0x24F

and can be programmed via the SPI interface as shown in

Figure 2. A write is initiated by sending the write instruc-

tion byte = 0x02 followed by the address and then data.

Conversionsareinitiatedbywritingtheconversioncontrol

byte (see Table 6) into memory location 0x000 (command

status register).

Table 2B. SPI Instruction Byte

INSTRUCTION

SPI INSTRUCTION BYTE

DESCRIPTION

Read

0b00000011

See Figure 1

Write

0b00000010

See Figure 2

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