THMC10

REMOTE/LOCAL TEMPERATURE MONITOR

WITH SMBus INTERFACE

SLIS089 – DECEMBER 1999

12

POST OFFICE BOX 655303

PRINCIPLES OF OPERATION

SMBus slave address select terminals (ADD0 and ADD1)

The ADD0 and ADD1 terminals allow the user to select between nine unique SMBus slave addresses to allow

up to nine THMC10 devices to be used by the same SMBus host controller. The following truth table shows how

the voltage at ADD0 and ADD1 determines the SMBus slave address of the THMC10.

Table 8. SMBus Slave Address Map (ADD0 and ADD1)

ADD0

ADD1

RESULTING SMBus ADDRESS

0

0

0011 000

0

3-State

0011 001

0

1

0011 010

3-State

0

0101 001

3-State

3-State

0101 010

3-State

1

0101 011

1

0

1001 100

1

3-State

1001 101

1

1

1001 110

SMBus serial clock input terminal (SCLK)

The SCLK terminal allows the host controller to send a clock signal that synchronizes the data coming into or

out of the SDATA terminal of the THMC10. The frequency of this clock can be anywhere between 10 kHz and

100 kHz. Timing diagrams showing the relationship of SCLK to SDATA are shown in Figure 1 through Figure 4.

SMBus serial data input/output terminal (SDATA)

The SDATA terminal allows the host controller to program the THMC10 with set points and with configuration

data. The SDATA terminal also allows the THMC10 to send data back to the host controller (remote and local

temperature, interrupt status, etc.). Data sent into or out of the SDATA terminal is synchronous with the rising

edge of SCLK. Timing diagrams in Figure 1 through Figure 5 show the relationship between SDATA and SCLK.

Table 1 through Table 5 show the THMC10 register maps that are used to configure and read the THMC10.