MAX16046A Datasheet, PDF (39/71 Pages) Maxim Integrated Products – 12-Channel/8-Channel EEPROM-Programmable System Managers with Nonvolatile Fault Registers

12-Channel/8-Channel EEPROM-Programmable
System Managers with Nonvolatile Fault Registers
Voltage Margining
Margining is commonly performed while a system is
under development, but margining can also be per-
formed during the manufacturing process. The supply
voltages of external DC-DC regulators can be adjusted
by trimming the regulator’s reference input (for voltage-
regulator modules), altering the voltage regulator’s
feedback node, or adjusting a “brick” power supply’s
trim input. See the Applications Information section for
sample circuits.
Margining can be controlled over the serial interface or by
using GPIO2 and GPIO3. Before adjusting the voltages
using the DAC outputs, enable voltage margining func-
tionality by setting the Margin bit at r4Dh[1] to ‘1’ (see
Table 1) or configure GPIO6 as MARGIN (see Tables 4
and 5). Set DACOUT_ voltages to the appropriate values
and then enable the appropriate DAC outputs.
To control margining with external circuitry, configure
GPIO2 and GPIO3 as MARGINUP and MARGINDN
inputs, respectively. Pull MARGINUP low and pull
MARGINDN high to select DACOUT_ voltage values
set in registers r66h to r71h. Pull MARGINDN low and
pull MARGINUP high to select DACOUT_ values set in
registers r72h to r7Dh (see Tables 19 and 20). Pull both
MARGINUP and MARGINDN high or low to select
DACOUT_ values set in registers r00h to r0Bh.
See Table 16 for more information on setting the volt-
age ranges for the DACOUT_ outputs. Table 20 shows
which register values are used for the DAC outputs for
each state of MARGINUP and MARGINDN.
Table 19. DACOUT1–DACOUT12 Margin Data
REGISTER/
EEPROM
ADDRESS
BIT
RANGE
66h
[7:0]
67h
[7:0]
68h
[7:0]
69h
[7:0]
6Ah
[7:0]
6Bh
[7:0]
6Ch
[7:0]
6Dh
[7:0]
6Eh
[7:0]
6Fh
[7:0]
70h
[7:0]
71h
[7:0]
*MAX16046A only
DESCRIPTION
DACOUT1 Margin-Up Data
DACOUT2 Margin-Up Data
DACOUT3 Margin-Up Data
DACOUT4 Margin-Up Data
DACOUT5 Margin-Up Data
DACOUT6 Margin-Up Data
DACOUT7 Margin-Up Data
DACOUT8 Margin-Up Data
DACOUT9 Margin-Up Data*
DACOUT10 Margin-Up Data*
DACOUT11 Margin-Up Data*
DACOUT12 Margin-Up Data*
REGISTER/
EEPROM
ADDRESS
72h
73h
74h
75h
76h
77h
78h
79h
7Ah
7Bh
7Ch
7Dh
BIT
RANGE
DESCRIPTION
[7:0]
[7:0]
[7:0]
[7:0]
[7:0]
[7:0]
[7:0]
[7:0]
[7:0]
[7:0]
[7:0]
[7:0]
DACOUT1 Margin-Down Data
DACOUT2 Margin-Down Data
DACOUT3 Margin-Down Data
DACOUT4 Margin-Down Data
DACOUT5 Margin-Down Data
DACOUT6 Margin-Down Data
DACOUT7 Margin-Down Data
DACOUT8 Margin-Down Data
DACOUT9 Margin-Down Data*
DACOUT10 Margin-Down Data*
DACOUT11 Margin-Down Data*
DACOUT12 Margin-Down Data*
Table 20. DACOUT Margining Output Dependencies
MARGINUP
(GPIO2)
1
1
0
0
MARGINDN
(GPIO3)
1
0
1
0
DACOUT REGISTER USED
DACOUT registers r00h to r0Bh
MARGIN DN registers r72h to r7Dh
MARGIN UP registers r66h to r71h
DACOUT registers r00h to r0Bh
DACOUT SWITCH STATE
Depends on r1Ch, r1Dh
Closed
Closed
Depends on r1Ch, r1Dh
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