LTC2983C View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC2983C' PDF : 72 Pages View PDF
LTC2983
Overview
Memory Map
The LTC2983 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
for accessing memory. The channel conversion results are
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.
Conversions are initiated by writing the conversion control
byte (see Table 6) into memory location 0x000 (command
status register).
Table 2A. Memory Map
LTC2983 MEMORY MAP
SEGMENT
START
ADDRESS
Command Status Register
0x000
Reserved
0x001
Temperature Result Memory
20 Words - 80 Bytes
0x010
Reserved
0x060
Global Configuration Register
0x0F0
Reserved
0x0F1
Measure Multiple Channels Bit Mask
0x0F4
Reserved
0x0F8
Reserved
0x0F9
Mux Configuration Delay
0x0FF
Reserved
0x100
Channel Assignment Data
0x200
Custom Sensor Table Data
0x250
Reserved
0x3D0
END
ADDRESS
0x000
0x00F
0x05F
0x0EF
0x0F0
0x0F3
0x0F7
0x0F8
0x0FE
0x0FF
0x1FF
0x24F
0x3CF
0x3FF
SIZE
(BYTES)
1
15
80
DESCRIPTION
See Table 6, Initiate Conversion, Sleep Command
See Tables 8 to 10, Read Result
144
1
3
4
See Tables 65, 66, Run Multiple Conversions
1
6
1
See MUX Configuration Delay Section of Data Sheet
256
80
See Tables 3, 4, Channel Assignment
384
48
Table 2B. SPI Instruction Byte
INSTRUCTION
Read
Write
No Opp
SPI INSTRUCTION BYTE
0b00000011
0b00000010
0bXXXXXX0X
DESCRIPTION
See Figure 1
See Figure 2
2983fa
14
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