Rainbow Electronics LM63 - Manual (Page 22)

2.0 LM63 Registers
(Continued)
ALERT Status And Mask Registers
ADDRESS
Hex
Read/
Write
Bits
POR
Value
Name Description
02
HEX
ALERT STATUS REGISTER (8-bits) (All Alarms are latched until read, then cleared if alarm condition was removed
at the time of the read.)
0x02
Read
Only
7 0 Busy
When this bit is a 0, the ADC is not converting.
When this bit is set to a 1, the ADC is performing a conversion. This bit
does not affect ALERT status.
6 0
Local
High Alarm
When this bit is a 0, the internal temperature of the LM63 is at or below
the Local High Setpoint.
When this bit is a 1, the internal temperature of the LM63 is above the
Local High Setpoint, and an ALERT is triggered.
5 0 This bit is unused and always read as 0.
4 0
Remote
High Alarm
When this bit is a 0, the temperature of the Remote Diode is at or below
the Remote High Setpoint.
When this bit is a 1, the temperature of the Remote Diode is above the
Remote High Setpoint, and an ALERT is triggered.
3 0
Remote
Low Alarm
When this bit is a 0, the temperature of the Remote Diode is at or above
the Remote Low Setpoint.
When this bit is a 1, the temperature of the Remote Diode is below the
Remote Low Setpoint, and an ALERT is triggered.
2 0
Remote Diode
Fault Alarm
When this bit is a 0, the Remote Diode appears to be correctly
connected.
When this bit is a 1, the Remote Diode may be disconnected or shorted.
This Alarm does not trigger an ALERT.
1 0
Remote
T_CRIT Alarm
When this bit is a 0, the temperature of the Remote Diode is at or below
the T_CRIT Limit.
When this bit is a 1, the temperature of the Remote Diode is above the
T_CRIT Limit, and an ALERT is triggered..
0 0 Tach Alarm
When this bit is a 0, the Tachometer count is lower than or equal to the
Tachometer Limit (the RPM of the fan is greater than or equal to the
minimum desired RPM).
When this bit is a 1, the Tachometer count is higher than the
Tachometer Limit (the RPM of the fan is less than the minimum desired
RPM), and an ALERT is triggered. Note that if this bit is set, the function
of the ALERT/Tach pin must be Tach input, so an external ALERT
condition will not be generated. The user may read the status register
periodically to find out if and ALERT condition has occurred.
LM63
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