REV. 0
ADM1022
–17–
Table VI. Register 0x40 Configuration Register
Bit Name Read/Write Description
0 START Read/Write Setting this bit to a “1” enables startup of ADM1022; clearing this bit to a “0” places
ADM1022 in standby mode. Caution: The INT output will not be cleared if the user
clears this bit after an interrupt has occurred (see “INT Clear” bit). At startup tempera-
ture monitoring and limit checking functions begin. Note, all limit values should be pro-
grammed into ADM1022 prior to using the standard thermal interrupt mechanism based
upon high and low limits. (Power-Up Default = 1.)
1 INT Enable Read/Write Setting this bit to a “1” enables the INT output. 1 = Enabled 0 = Disabled
(Power-Up Default = 0).
2 INT Clear Read/Write This bit clears the INT output when set (1) without affecting the contents of the Interrupt
Status Register. (Power-Up Default = 1.)
3 Programmable Read/Write Setting this bit to a “1” will lock in the value set into the Programmable Local and Remote
Automatic Trip Once Automatic Trip Point Registers (Value Register locations 0x13 and 0x14). Furthermore,
Point Lock Bit when this bit is set, the values in the Default Local and Remote Automatic Trip Point
Registers (Value Register locations 0x17 and 0x18) will no longer have an effect on the
THERM, FAN_SPD or FAN-OFF outputs. This bit cannot be written again until after
RST2 has been asserted or Power-On Reset occurs. (Power-Up Default = 0.)
4 Soft Reset Read/Write Setting this bit to a “1” will restore power-up default values to the Configuration Regis-
ter, Interrupt Status Register, Interrupt Status Register Mirror, Interrupt Mask Register.
This bit automatically clears itself since the power-on default is zero.
5 FAN OFF Read/Write Setting this bit to a “1” will cause the FAN OFF pin to be floated. Clearing this bit to “0”
will cause the FAN OFF pin to be driven low, which requests that the fan be turned off.
This bit will be unconditionally set if the THERM pin is ever asserted. Reading this bit
reflects the state of the FAN-OFF output buffer. Due to the open-drain nature of this pin
the value read does not represent the actual state of the external circuit connected to it.
(Power-Up Default = 1.)
6 GPI Invert Read/Write Setting this bit to a “1” will invert the GPI input for the purpose of level detection and
interrupt generation. Clearing this bit to a “0” leaves the GPI input unmodified. (Power-
Up Default = 0.)
7 D2 Read/Write Setting this bit configures Pins 11 and 12 as inputs for a second diode temperature sen-
sor. Clearing this bit configures Pin 11 as THERM output and Pin 12 as general purpose
logic input (GPI). (Power-Up Default = 0.)
Table VII. Register 0x41 Interrupt Status Register. Power-On Default <7:0> = 00h
Bit Name Read/Write Description
0 Int. Temp Error Read Only A one indicates that one of the internal temperature sensor limits has been exceeded.
1 Ext. Temp2 Error Read Only A one indicates that one of the limits for the second external temperature sensor has
been exceeded.
2 Diode 2 Fault Read Only A one indicates either a short- or open-circuit fault on remote sensor diode 2.
3 Reserved Read Only Undefined.
4 GPI Input Read Only A “1” indicates that the GPI pin is asserted. The polarity of the GPI pin is determined
by GPI Invert (Bit 6) in the Configuration Register. For example, if GPI Invert is cleared,
this bit will be “1” when the GPI pin is high (“1”); this bit will be “0” when the GPI
pin is low (“0”). If GPI Invert is set, this bit will be “1” when the GPI pin is low (“0”);
this bit will be “0” when the GPI pin is high (“1”). Note that the state of GPI is not
latched; this bit simply reflects the state or inverted state of the GPI pin. Note: if this
bit is “1” reading this register will NOT clear it to “0.”
5 Ext. Temp1 Error Read Only A one indicates that one of the limits for the first external temperature sensor has been
exceeded.
6 THERM Input Read Only A one indicates that the thermal overload (THERM) line has been asserted externally.
7 Diode 1 Fault Read Only A one indicates either a short- or open-circuit fault on remote sensor diode 1.
NOTE: An error that causes continuous interrupts to be generated may be masked in its respective mask register until the error can be alleviated.
