LTC2990CMS View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC2990CMS' PDF : 24 Pages View PDF
LTC2990
Applications Information
S ADDRESS W# A COMMAND A DATA A DATA A P
10011a1:a0 0 0 XXXXXb3:b0 0 b7:b0 0 b7:b0 0
2990 F06
Figure 6. LTC2990 Serial Bus Repeated Write Byte Protocol
S ADDRESS W# A COMMAND A S ADDRESS R A DATA A# P
10011a1:a0 0 0 XXXXXb3:b0 0
10011a1:a0 1 0 b7:b0 1
2990 F07
Figure 7. LTC2990 Serial Bus Read Byte Protocol
S ADDRESS W# A COMMAND A S ADDRESS R A DATA A DATA A# P
10011a1:a0 0 0 XXXXXb3:b0 0
10011a1:a0 1 0 b7:b0 0 b7:b0 1
2990 F08
Figure 8. LTC2990 Serial Bus Repeated Read Byte Protocol
Table 1. I2C Base Address
HEX I2C BASE ADDRESS
98h
9Ah
9Ch
9Eh
*X = R/W Bit
BINARY I2C BASE ADDRESS
1001 100X*
1001 101X*
1001 110X*
1001 111X*
ADR1
0
0
1
1
ADR0
0
1
0
1
Table 2. LTC2990 Register Address and Contents
REGISTER ADDRESS*†
REGISTER NAME
READ/WRITE
DESCRIPTION
00h
STATUS
R
Indicates BUSY State, Conversion Status
01h
CONTROL
R/W
Controls Mode, Single/Repeat, Celsius/Kelvin
02h
TRIGGER**
R/W
Triggers an Conversion
03h
N/A
Unused Address
04h
TINT (MSB)
R
Internal Temperature MSB
05h
TINT (LSB)
R
Internal Temperature LSB
06h
V1 (MSB)
R
V1, V1 – V2 or TR1 MSB
07h
V1 (LSB)
R
V1, V1 – V2 or TR1 LSB
08h
V2 (MSB)
R
V2, V1 – V2 or TR1 MSB
09h
V2 (LSB)
R
V2, V1 – V2 or TR1 LSB
0Ah
V3 (MSB)
R
V3, V3 – V4 or TR2 MSB
0Bh
V3 (LSB)
R
V3, V3 – V4 or TR2 LSB
0Ch
V4 (MSB)
R
V4, V3 – V4 or TR2 MSB
0Dh
V4 (LSB)
R
V4, V3 – V4 or TR2 LSB
0Eh
VCC (MSB)
0Fh
VCC (LSB)
R
VCC MSB
R
VCC LSB
*Register Address MSBs b7-b4 are ignored.
**Writing any value triggers a conversion. Data Returned reading this register address is the Status register.
†Power-on reset sets all registers to 00h.
2990f
14
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