ISL6112
13
FN6456.1
August 25, 2011
SMI-only Control Applications on page18). The ISL6112 can be
operated exclusively from either the SMI or HPI, or can employ
the HPl for power control while continuing to use the SMI for
access to all but the power control registers.
In addition to the basic power control features of the ISL6112
accessible by the HPI, the SMI gives the host access to the
following information from the part:
"Fault conditions occurring on each supply. These faults include
overcurrent, over-temperature and undervoltage.
"GPI pin status when using the system.
When using the SMI for power control, the HPI must not be used.
Conversely, when using the HPI for power control, power control
commands must not be executed over the SMI bus. All other
register accesses via the SMI bus remain permissible while in HPI
control mode. When using SMI exclusively, the HPI input pins (ON,
AUXEN, and FORCE_ON
) should be configured as shown in Figure
27 (disabling HPI when SMI control is used). This configuration
safeguards the power slots if the SMBus communication link is
disconnected for any reason.
When using HPI exclusively, the SMBus (or SMI) will be inactive if
the input pins (SDA, SCL, A0, A1, and A2) are configured as
shown in Figure 27.
FIGURE 17. VAUX TURN-ON R
LOAD
 = 10&, C
LOAD
 = 100礔
FIGURE 18. 12VMAIN START-UP R
LOAD
 = 10&, C
LOAD
 = 470礔
FIGURE 19. 3VMAIN START-UP R
LOAD
 = 2&, C
LOAD
 = 470礔
FIGURE 20. 12VMAIN START-UP R
LOAD
 = 10&, C
LOAD
 = 470礔
VAUX
IAUX
AUXEN
VAUX
IAUX
AUXEN
12V
OUT
12V
GATE
C
GD
 = 6800pF
12I
OUT
C
FILTER
C
GS
 = 22nF
3V
OUT
3V
GATE
3I
OUT
C
FILTER
C
GATE
 = 22nF
C
FILTER
 RESPONDING TO UNSHOWN MAIN SUPPLY
12V
OUT
12V
GATE
C
GD
 = 6800pF
12I
OUT
C
FILTER
C
GS
 = 2200pF
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