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LM89
www.ti.com
SNIS128C – AUGUST 2002 – REVISED MARCH 2013
5. Master/slave NoACK
6. Master sends STOP
7. Master attends to conditions that caused the ALERT to be triggered. The STATUS REGISTER is read and
fan started, setpoint limits adjusted, etc.
8. Master resets the ALERT mask (D7 in the Configuration register).
The ARA, 000 1100, is a general call address. No device should ever be assigned this address.
Bit D0 (the ALERT configure bit) in the FILTER and ALERT CONFIGURE REGISTER (xBF) must be set low in
order for the LM89 to respond to the ARA command.
The ALERT output can be disabled by setting the ALER T mask bit, D7, of the Configuration register. The power-
on-default is to have the ALERT mask bit and the ALERT configure bit low.
Remote High Limit
RDTS Measurement
LM89 ALERT pin
ALERT mask set in
response to ARA
from master
Status Register: RTDS High
TIME
Figure 6. ALERT Output as an SMBus ALERT Temperature Response Diagram
T_CRIT_A OUTPUT and T_CRIT LIMIT
T_CRIT_A is activated when any temperature reading is greater than the limit preset in the critical temperature
setpoint register (T_CRIT), as shown in Figure 7 . The Status Register can be read to determine which event
caused the alarm. A bit in the Status Register is set high to indicate which temperature reading exceeded the
T_CRIT setpoint temperature and caused the alarm, see STATUS REGISTER (SR) .
Local and remote temperature diodes are sampled in sequence by the A/D converter. The T_CRIT_A output and
the Status Register flags are updated after every Local and Remote temperature conversion. T_CRT_A follows
the state of the comparison, it is reset when the temperature falls below the setpoint RCS-TH. The Status
Register flags are reset only after the Status Register is read and if a temperature conversion(s) is/are below the
T_CRIT setpoint, as shown in Figure 7 .
Figure 7. T_CRIT_A Temperature Response Diagram
Copyright ? 2002–2013, Texas Instruments Incorporated
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