Datasheet

D7 D6 D5 D4 D3 D2 D1 D0

1 9 1 9

Ack

LM95245

Start by

Master

R/W

Frame 1

Serial Bus Address Byte

Frame 2

Command Byte

Ack by

LM95245

SMBCLK

SMBDAT

A5 A3 A2 A0A6 A4 A1

Stop

Master

Hysteresis

Output Pin

Remote OS Limit

Remote

Temperature

Status bit ROS

Remote OS Limit -

Hysteresis

LM95245

www.ti.com

SNIS148G –OCTOBER 2007–REVISED MARCH 2013

OS OUTPUT AND OS LIMIT

The LM95245's OS/A0 pin is selected as an OS digital output as described in SMBus INTERFACE. As an OS

pin, it is activated whenever the local and/or remote temperature conversion is above the limits defined by the

Limit registers. If the remote temperature exceeds the value in the Remote OS Limit Register the Status Bit for

Remote OS (ROS) in Status Register 1 is set to 1. In the same way if the local temperature exceeds the value in

the Local Shared OS and TCRIT Limit Register the Status Bit for the Shared Local OS and TCRIT (LOC) bit in

Status Register 1 is set to 1. The state of the T_CRIT pin output will return to the HIGH state when both the

Local and Remote temperatures are below the values programmed into the Limit Registers less the value in the

Common Hysteresis Register. The OS output and the Status Register flags are updated after every Local and

Remote temperature conversion. See Figure 13.

Figure 13. OS Temperature Response Diagram

DIODE FAULT DETECTION

The LM95245 is equipped with operational circuitry designed to detect fault conditions concerning the remote

diodes. In the event that the D+ pin is detected as shorted to GND, V

or D+ is floating, the Remote

Temperature reading is –128.000 °C if signed format is selected and +255.875 °C if unsigned format is selected.