LM64EVAL National Semiconductor, LM64EVAL Datasheet - Page 23

• Manufacturer Part Number: LM64EVAL
• Description: BOARD EVALUATION LM64
• Manufacturer: National Semiconductor

Specifications of LM64EVAL

• Sensor Type: Temperature, Fan Controller
• Sensing Range: 0°C ~ 85°C
• Interface: SMBus (2-Wire/I²C)
• Sensitivity: ±1°C
• Voltage - Supply: 3 V ~ 3.6 V
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: LM64
• Lead Free Status / RoHS Status: Not applicable / Not applicable

ADDRESS
02
at the time of the read.)
16
2.0 LM64 Registers
ALERT Status And Mask Registers
HEX
HEX
0x02
Hex
16
ALERT STATUS REGISTER (8-bits) (All Alarms are latched until read, then cleared if alarm condition was removed
ALERT MASK REGISTER (8-bits)
Read/
Write
Read
Only
R/W
Bits
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
Value
POR
0
0
0
0
0
0
0
0
1
0
1
0
0
1
0
0
(Continued)
High Alarm Mask
Remote Diode
T_CRIT Alarm
Alarm Mask
Alarm Mask
Alarm Mask
Fault Alarm
Tach Alarm
High Alarm
High Alarm
Low Alarm
Local High
Low Alarm
Remote
Remote
Remote
Remote
Remote
Remote
T_CRIT
Name
Local
Mask
Busy
Tach
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 LM64 is at or below
the Local High Setpoint.
When this bit is a 1, the internal temperature of the LM64 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.
This bit is unused and always read as 1.
When this bit is a 0, a Local High Alarm event will generate an ALERT.
When this bit is a 1, a Local High Alarm will not generate an ALERT
This bit is unused and always read as 1.
When this bit is a 0, Remote High Alarm event will generate an ALERT.
When this bit is a 1, a Remote High Alarm event will not generate an
ALERT.
When this bit is a 0, a Remote Low Alarm event will generate an
ALERT.
When this bit is a 1, a Remote Low Alarm event will not generate an
ALERT.
This bit is unused and always read as 1.
When this bit is a 0, a Remote T_CRIT event will generate an ALERT.
When this bit is a 1, a Remote T_CRIT event will not generate an
ALERT.
When this bit is a 0, a Tach Alarm event will generate an ALERT.
When this bit is a 1, a Tach Alarm event will not generate an ALERT.
23
Description
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