Datasheet

Remote High Limit
Remote Diode Measurement
Time
Temperature
ALERT mask set
in response to
ARA from master
Status Register: Remote High
LM96163
ALERT Pin
Voltage
LM96163
www.ti.com SNAS433D –JUNE 2008–REVISED MAY 2013
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 10. 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
register. The RCRIT bit will be reset when the remote temperature equals or is less than the value defined by
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 LM96163 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 LM96163 operates as a slave on the SMBus the SMBCLK line is an input and the SMBDAT line is
bidirectional. The LM96163 never drives the SMBCLK line and it does not support clock stretching. According to
SMBus specifications, the LM96163 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:
A6 A5 A4 A3 A2 A1 A0
1 0 0 1 1 0 0
POWER-ON RESET (POR) DEFAULT STATES
For information on the POR default states see 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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