ADM1028ARQ ON Semiconductor, ADM1028ARQ Datasheet - Page 14

• Manufacturer Part Number: ADM1028ARQ
• Description: IC SENSOR TEMP/FAN CTRL 16QSOP
• Manufacturer: ON Semiconductor

Specifications of ADM1028ARQ

• Rohs Status: RoHS non-compliant
• Function: Fan Control, Temp Monitor
• Topology: ADC, Register Bank
• Sensor Type: External & Internal
• Sensing Temperature: 0°C ~ 100°C, External Sensor
• Output Type: SMBus™
• Output Alarm: No
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: 0°C ~ 100°C
• Mounting Type: Surface Mount
• Package / Case: 16-QSOP

ADM1028
Bit
0
1
2
3
4
5
6
7
Bit
0
1
2
3
4
5
6
7
Name
START
INT Enable
Reserved
Programmable
Therm Limit
Lock Bit
Soft Reset
FAN_OFF
GPI Invert
Reserved
Name
Int. Temp Error
Flag 1
Flag 2
Int. THERM
GPI Input
Ext. Temp Error
Ext. THERM
Ext Diode Fault
Table VI. Register 0x41. Interrupt Status Register. Power-On Default <7:0> = 00h
Table V. Register 0x40 Configuration Register Power-On Default <7:0> = 21h
R/W
Read/Write
Read/Write
Read Only
Read/Write Once
Read/Write
Read/Write
Read/Write
Read Only
Read/Write
Read/Write
“1” to clear
Read/Write
Read/Write
Read/Write
“1” to clear
Read Only
Read/Write
“1” to clear
Read/Write
“1” to clear
Read/Write
“1” to clear
Description
Setting this bit to a “1” enables startup of ADM1028; clearing this bit to “0”
places ADM1028 in standby mode. At startup, temperature monitoring and
limit checking functions begin. Note, all limit values should be programmed
into ADM1028 prior to using the standard thermal interrupt mechanism
based upon high and low limits. (Power-Up Default = 1.)
Setting this bit to a “1” enables the INT output. 1 = Enabled 0 = Disabled
(Power-Up Default = 0.)
Reserved (Default = 0).
Setting this bit to a “1” will lock in the value set into the Programmable Remote
Therm Limit Register (Value Register 0x14). Furthermore, if this bit is set,
the values in the Default Remote Therm Limit Register Bit (Value Register
0x18) will no longer have an effect on the THERM, FAN_SPD, or FAN_OFF
outputs. This bit cannot be written again until after RST has been asserted.
(Power-Up Default = 0.)
Setting this bit to a “1” will restore power-up default values to the Configu-
ration Register, Interrupt Status Register and Interrupt Mask Register. This
also rearms INT structure but not the THERM structure. This bit automati-
cally clears itself since the power-on default is zero.
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; once THERM is negated this bit must be returned to its
prior state (prior to THERM assertion). 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 con-
nected to it. (Power-Up Default = 1.)
Setting this bit to a “1” will invert the GPI input for the purpose of level
detection and interrupt generation. Clearing this bit to “0” leaves the GPI
input unmodified. (Power-Up Default = 0.)
Reserved. (Power-Up Default = 0).
Description
A one indicates that one of the limits for the internal temperature sensor
has been exceeded.
This bit can be used as a general purpose flag with the capability of generat-
ing an interrupt. Writing a “1” to this bit causes it to be set to “1.” Writing a
“0” clears this bit.
This bit can be used as a general purpose flag with the capability of generat-
ing an interrupt. Writing a “1” to this bit causes it to be set to “1.” Writing a
“0” clears this bit.
A one indicates that the internal thermal overload (THERM) limit has
been exceeded.
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 ex-
ample, if GPI Invert is cleared then 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 then 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.”
A one indicates that one of the limits for the external temperature sensor
has been exceeded.
A one indicates that the external thermal overload (THERM) limit has
been exceeded.
A one indicates either a short- or open-circuit fault on the remote sensor diode.
–14–
REV. B