Datasheet

LTC2990
14
2990fc
APPLICATIONS INFORMATION
Figure 8. LTC2990 Serial Bus Repeated Read Byte Protocol
SAASW#ADDRESS COMMAND A
00 10
DATA
b7:b0010011a1:a0
ADDRESS
10011a1:a0XXXXXb3:b0 1
2990 F07
PA#R
Figure 7. LTC2990 Serial Bus Read Byte Protocol
SAASW#ADDRESS COMMAND A
00 10
A
0
DATA
b7:b0010011a1:a0
ADDRESS
10011a1:a0XXXXXb3:b0 1
2990 F08
PA#DATA
b7:b0
R
Table 3. 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 T
INT
(MSB) R Internal Temperature MSB
05h T
INT
(LSB) R Internal Temperature LSB
06h V1 (MSB) R V1, V1 – V2 or T
R1
MSB
07h V1 (LSB) R V1, V1 – V2 or T
R1
LSB
08h V2 (MSB) R V2, V1 – V2 or T
R1
MSB
09h V2 (LSB) R V2, V1 – V2 or T
R1
LSB
0Ah V3 (MSB) R V3, V3 – V4 or T
R2
MSB
0Bh V3 (LSB) R V3, V3 – V4 or T
R2
LSB
0Ch V4 (MSB) R V4, V3 – V4 or T
R2
MSB
0Dh V4 (LSB) R V4, V3 – V4 or T
R2
LSB
0Eh V
CC
(MSB) R V
CC
MSB
0Fh V
CC
(LSB) R V
CC
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.
Table 2. I
2
C Base Address
HEX I
2
C BASE ADDRESS BINARY I
2
C BASE ADDRESS ADR1 ADR0
98h 1001 100X* 0 0
9Ah 1001 101X* 0 1
9Ch 1001 110X* 1 0
9Eh 1001 111X* 1 1
EEh 1110 1110 Global Sync Address
*X = R/W Bit
S A A DATAW#ADDRESS COMMAND A
0 0 b7:b0
DATA
b7:b0010011a1:a0 XXXXXb3:b0 0 0
2990 F06
PA
Figure 6. LTC2990 Serial Bus Repeated Write Byte Protocol