ADM1026
Starting Conversion
Note that the limit registers (0Dh to 12h, 40h to 6Dh) are not
reset by the software reset function. This can be useful if one
needs to reset the part but does not want to reprogram all
parameters again. Note that a power-on reset initializes all
registers on the ADM1026, including the limit registers.
The monitoring function (analog inputs, temperature, and fan
speeds) in the ADM1026 is started by writing to Configuration
Register 1 and setting Start (Bit 0) high. The
_Enable
INT
(Bit 1) should be set to 1, and
Clear (Bit 2) set to 0 to
INT
enable bit (Bit 4) should be set
enable interrupts. The
THERM
Application Schematic
to 1 to enable temperature interrupts at the
pin. Apart
THERM
Figure 62 shows how the ADM1026 could be used in an
application that requires system management of a PC or server.
Several GPIOs are used to read the VID codes of the CPU. Up
to two CPU temperature measurements can be read back. All
power supply voltages are monitored in the system. Up to eight
fan speeds can be measured, irrespective of whether they are
controlled by the ADM1026 or hardwired to a system supply.
The VREF output includes the recommended filtering circuitry.
from initially starting together, the analog measurements and
fan speed measurements proceed independently, and are not
synchronized in any way.
Reduced Power Mode
The ADM1026 can be placed in a low power mode by setting
Bit 0 of the configuration register to 0. This disables the internal
ADC.
Software Reset Function
As previously mentioned, the ADM1026 can be reset in
software by setting Bit 7 of Configuration Register 1 (Reg. 00h)
to 1. Configuration Register 1, 00h, should then be manually
cleared. Note that the software reset differs from a power-on
reset in that only some of the ADM1026 registers are reinitial-
ized to their power-on default values. The registers that are
initialized to their default values by the software reset are
•
•
Configuration Registers (Registers 01h to 0Bh)
Mask Registers 1 to 6, internal temperature offset, and
Status Registers 4, 5, and 6 (Registers 18h to 25h)
All value registers (Registers 1Fh, 20h to 3Fh)
External 1 and External 2 Offset Registers (6Eh, 6Fh)
•
•
Rev. A | Page 34 of 56
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