LM63EVAL National Semiconductor, LM63EVAL Datasheet - Page 22

• Manufacturer Part Number: LM63EVAL
• Manufacturer: National Semiconductor

Specifications of LM63EVAL

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ADDRESS
02
at the time of the read.)
2.0 LM63 Registers
ALERT Status And Mask Registers
HEX
0x02
Hex
ALERT STATUS REGISTER (8-bits) (All Alarms are latched until read, then cleared if alarm condition was removed
Read/
Write
Read
Only
Bits
7
6
5
4
3
2
1
0
Value
POR
0
0
0
0
0
0
0
0
(Continued)
Remote Diode
T_CRIT Alarm
Fault Alarm
Tach Alarm
High Alarm
High Alarm
Low Alarm
Remote
Remote
Remote
Name
Local
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.
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.
This bit is unused and always read as 0.
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.
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.
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.
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..
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.
22
Description