Datasheet

LM81
SNAS011E –JUNE 1999–REVISED FEBRUARY 2002 www.ti.com
Power on default - <7:0> = 00001000 binary
Bit Name Read/Write Description
1 INT Enable Read/Write A one enables the INT Interrupt output.
2 Reserved Read/Write
3 INT_Clear Read/Write A one disables the INT output without affecting the
contents of Interrupt Status
Registers. The device will stop monitoring. It will resume
upon clearing of this bit.
4 RESET Read/Write A one outputs at least a 20 ms active low reset signal at
RESET. This bit is cleared once the pulse has gone
inactive.
5 Reserved Read/Write
6 CI_Clear Read/Write A one outputs a minimum 20 ms active low pulse on the CI
pin. The register bit self clears after the pulse has been
output. This bit is mirrored in the CI Clear Register bit 7.
7 INITIALIZATION Read/Write A one restores power on default value to the Configuration
Register, Interrupt Status Registers, Interrupt Mask
Registers, CI Clear Register, VID/Fan Divisor Register,
VID4, Temperature Configuration Register, and the
Extended Mode Registers. This bit clears itself since the
power on default is zero.
INTERRUPT STATUS REGISTER 1 — ADDRESS 41H
Power on default - <7:0> = 00001000 binary
Bit Name Read/Write Description
0 +2.5Vin Read Only A one indicates a High or Low limit has been exceeded.
1 Vccp1 Read Only A one indicates a High or Low limit has been exceeded.
2 +3.3Vin Read Only A one indicates a High or Low limit has been exceeded.
3 +5Vin Read Only A one indicates a High or Low limit has been exceeded.
4 Temperature Read Only A one indicates a HIGH or HIHYST temperature error, see
the TEMPERATURE INTERRUPTS section.
5 Reserved Read Only
6 FAN1 Read Only A one indicates the fan count limit has been exceeded.
7 FAN2 Read Only A one indicates the fan count limit has been exceeded.
INTERRUPT STATUS REGISTER 2 — ADDRESS 42H
Power on default - <7:0> = 00001000 binary
Bit Name Read/Write Description
0 +12Vin Read Only A one indicates a High or Low limit has been exceeded.
1 Vccp2 Read Only A one indicates a High or Low limit has been exceeded.
2 Reserved Read Only
3 Reserved Read Only
4 CI Read Only A one indicates CI (Chassis Intrusion) has gone high.
5 Reserved Read Only
6 Reserved Read Only
7 TLOW Read Only A one indicates LOW temperature error in EXTENDED
MODE ONLY, see the TEMPERATURE INTERRUPTS
section.
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