THMC10_08 Datasheet, PDF (10/22 Pages) Texas Instruments – REMOTE/LOCAL TEMPERATURE MONITOR WITH SMBus INTERFACE

THMC10
REMOTE/LOCAL TEMPERATURE MONITOR
WITH SMBus INTERFACE
SLIS089 − DECEMBER 1999
PRINCIPLES OF OPERATION
SMBus registers and addresses (continued)
Table 6. Acquistion Rate Register Bit Assignments
DATA
00h
01h
02h
03h
04h
05h
06h
07h
08h to FFh
ACQUISITION RATE
(Hz)
0.0625
0.125
0.25
0.5
1
2
4
8
Reserved
AVERAGE SUPPLY CURRENT
(µA TYPICAL AT VDD=3.3V)
40
40
40
40
42
45
55
65
N/A
Table 7. Alert Response Address Map
(Using Receive Byte Format in Figure 5)
THMC10 ALERT RESPONSE
SMBUS SLAVE ADDRESS
0001 100
0001 100
0001 100
0001 100
0001 100
0001 100
0001 100
0001 100
0001 100
ADD1
0
0
0
3-State
3-State
3-State
1
1
1
ADD0
0
3-State
1
0
3-State
1
0
3-State
1
DATA IF
ALERT LOW
0011 000
0011 001
0011 010
0101 001
0101 010
0101 011
1001 100
1001 101
1001 110
functional description
standby input (STBY)
Standby mode disables the A/D and reduces the supply current drain to less than 10 µA.
Standby mode is engaged by forcing the STBY terminal low or by setting the start/stop bit in the configuration
byte register to a 1.
Hardware and software standby modes behave almost identically. All data is retained in memory and the SMBus
interface is active and scanning for reads and writes. The only difference is that in hardware standby mode, the
one-shot command does not initiate an acquisition. The standby mode is not a shutdown mode. With activity
on the SMBus, extra supply current is drawn (see A/D and supply dc electrical characteristics). In the software
standby mode, the THMC10 can be forced to perform temperature acquisitions via the one-shot command,
despite the start/stop bit being high.
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