THMC10

REMOTE/LOCAL TEMPERATURE MONITOR

WITH SMBus INTERFACE

SLIS089 – DECEMBER 1999

10

POST OFFICE BOX 655303

PRINCIPLES OF OPERATION

SMBus registers and addresses (continued)

Table 6. Acquistion Rate Register Bit Assignments

DATA

ACQUISITION RATE

(Hz)

AVERAGE SUPPLY CURRENT

(

µA TYPICAL AT VDD=3.3V)

00h

0.0625

40

01h

0.125

40

02h

0.25

40

03h

0.5

40

04h

1

42

05h

2

45

06h

4

55

07h

8

65

08h to FFh

Reserved

N/A

Table 7. Alert Response Address Map

(Using Receive Byte Format in Figure 5)

THMC10 ALERT RESPONSE

SMBUS SLAVE ADDRESS

ADD1

ADD0

DATA IF

ALERT LOW

0001 100

0

0

0011 000

0001 100

0

3-State

0011 001

0001 100

0

1

0011 010

0001 100

3-State

0

0101 001

0001 100

3-State

3-State

0101 010

0001 100

3-State

1

0101 011

0001 100

1

0

1001 100

0001 100

1

3-State

1001 101

0001 100

1

1

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.