LM96063 datasheet(12/46 Pages) TI2

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Remote High Limit

RDTS Measurement

Time

ALERT mask set

in response to

ARA from master

Status Register: Remote High

LM96063

ALERT Pin

LM96063

SNIS149B – NOVEMBER 2011 – REVISED MARCH 2013

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The ALERT output can be disabled by setting the ALERT Mask bit in the Configuration Register. The power-on

default is to have the ALERT Mask bit and the ALERT Configuration bit low.

Figure 8. ALERT Output as an SMBus ALERT Temperature Response Diagram

TCRIT Function

The TCRIT output will be activated whenever the RCRIT bit in the ALERT Status register is set. This occurs

whenever the remote temperature exceeds the value set by the Remote T_CRIT Setpoint register. There is a

hysteresis associated with the T_CRIT Setpoint that is set by the value in the Remote T_CRIT Hysteresis

Remote T_CRIT Setpoint minus T_CRIT Hysteresis. The resolution of the comparison is 1 °C. For example if

T_CRIT = 110 °C and THYST = 5 °C the TCRIT output will activate when the temperature reading is 111 °C and

deactivate when the temperature reading is 105 °C.

When the LM96063 powers up the T_CRIT limit is locked to the default value. It may be changed after the

T_CRIT Limit Override bit (TCRITOV) bit, found in the Configuration Register, is set.

The format of the Remote T_CRIT setpoint register is controlled by the USF bit found in the Enhanced

configuration register. The temperature reading format used for the T_CRIT comparisons is +255 °C to -256°C.

SMBus INTERFACE

Since the LM96063 operates as a slave on the SMBus the SMBCLK line is an input and the SMBDAT line is

bidirectional. The LM96063 never drives the SMBCLK line and it does not support clock stretching. According to

SMBus specifications, the LM96063 has a 7-bit slave address. All bits, A6 through A0, are internally programmed

and cannot be changed by software or hardware.

The complete slave address is:

POWER-ON RESET (POR) DEFAULT STATES

For information on the POR default states see LM96063 REGISTER MAP IN FUNCTIONAL ORDER.

TEMPERATURE DATA FORMAT

Temperature data can only be read from the Local and Remote Temperature value registers. The data format for

all temperature values is left justified 16-bit word available in two 8-bit registers. Unused bits will always report

"0". All temperature data is clamped and will not roll over when a temperature exceeds full-scale value.

Remote temperature and remote high setpoint temperature data can be represented by an 11-bit, two's

complement word or unsigned binary word with an LSb (Least Significant Bit) equal to 0.125°C.

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