Analog Devices LTM4683 Manual page 17

PIN FUNCTIONS
configure the LTM4683's Channel 3 output to power-
up to a VOUT_COMMAND value (and associated output
voltage monitoring and protection/fault-detection thresh-
olds) different from those of NVM contents. (See the
Applications Information section.) Connecting resistor(s)
from VOUT3_CFG to SGND and/or VTRIM3_CFG to SGND
in this manner allows a convenient way to configure mul-
tiple LTM4683s with identical NVM contents for different
output voltage settings all without GUI intervention or
the need to custom-preprogram module NVM contents.
Minimize capacitance especially when the pin is left open
to ensure accurate detection of the pin state. Note that
using R s on VOUT3_CFG/VTRIM3_CFG can affect
CONFIG
the V range setting (MFR_PWM_MODE1[1]) and loop
OUT3
gain. For addressed ASEL_23, Page 0x00 corresponds to
Channel 2, and Page 0x01 corresponds to Channel 3. See
PAGE description section.
VTRIM3_CFG (AB9): Output Voltage Select Pin for V
Fine Setting. Works in combination with VOUT3_CFG to
affect the VOUT_COMMAND (and associated output volt-
age monitoring and protection/fault-detection thresholds)
of Channel 3, at SV power-up. (See VOUT3_CFG and
IN_23
the Applications Information section.) A resistor divider
from 2.5V to SGND connected to the pin will set the TRIM
value. See Table 2. Minimize capacitance especially when
the pin is left open to ensure accurate detection of the
pin state. Note that using R
VTRIM3_CFG can affect the V
PWM_MODE0[1]) and loop gain. For addressed ASEL_23,
Page 0x00 corresponds to Channel 2, and Page 0x01 cor-
responds to Channel 3. See PAGE description section.
VTRIM2_CFG (AB10): Output Voltage Select Pin for V
Fine Setting. Works in combination with VOUT2_CFG to
affect the VOUT_COMMAND (and associated output volt-
age monitoring and protection/fault-detection thresholds)
of Channel 2, at SV power-up. (See VOUT2_CFG and
IN_23
the Applications Information section.) A resistor divider
from 2.5V to SGND connected to the pin will set the TRIM
value. See Table 2. Minimize capacitance especially when
the pin is left open to ensure accurate detection of the
pin state. Note that using R
VTRIM2_CFG can affect the V
PWM_MODE0[1]) and loop gain. For addressed ASEL_23,
OUT3
s on VOUT3_CFG/
CONFIG
range setting (MFR_
OUT3
OUT2
s on VOUT2_CFG/
CONFIG
range setting (MFR_
OUT2
For more information
Page 0x00 corresponds to Channel 2, and Page 0x01 cor-
responds to Channel 3. See PAGE description section.
V (AB11): Internally Generated 2.5V Power Supply
DD25_23
Output Pin for Channel 2 and Channel 3 Circuits. Do not
load this pin with the external current; it is used strictly
to bias internal logic and provides current for the internal
pull-up resistors connected to the configuration-program-
ming pins. No external decoupling is required.
VOUT1_CFG (B8): Output Voltage Select Pin for V
Coarse Setting. If the VOUT1_CFG and VTRIM1_CFG pins
are both left open—or, if the LTM4683 is configured to ignore
pin-strap (R ) resistors, i.e., MFR_CONFIG_ALL[6] =
CONFIG
1b—then the LTM4683s target V
ting (VOUT_COMMAND1) and associated power-good and
OV/UV warning and fault thresholds are dictated at SV
power-up according to the LTM4683's NVM contents. A
resistor divider connected to 2.5V and SGND to this pin—in
,
combination with resistor pin settings on VTRIM1_CFG, and
using the factory-default NVM setting of MFR_CONFIG_
ALL[6] = 0b—can be used to configure the LTM4683's
Channel 1 output to power-up to a VOUT_COMMAND
value (and associated output voltage monitoring and pro-
tection/fault-detection thresholds) different from those of
NVM contents. (See the Applications Information section.)
Connecting resistor(s) from VOUT1_CFG to SGND and/or
VTRIM1_CFG to SGND in this manner allows a convenient
way to configure multiple LTM4683s with identical NVM
contents for different output voltage settings all without
GUI intervention or the need to custom-preprogram module
NVM contents. Minimize capacitance especially when the
pin is left open to ensure accurate detection of the pin state.
Note that using R
,
CONFIG
affect the V range setting (MFR_PWM_MODE1[1]) and
OUT1
loop gain. For addressed ASEL_01, Page 0x00 corresponds
to Channel 0, and Page 0x01 corresponds to Channel 1. See
PAGE description section.
ASEL_01 (B9): Serial Bus Address Configuration Pin for
Channel 0 and Channel 1 Controller. On any given I
SMBus serial bus segment, every device must have its
own unique subordinate address. If this pin is left open,
the LTM4683 powers up to its default subordinate address
of 0x4E (hexadecimal), i.e., 1001110b (industry-standard
www.analog.com
LTM4683
output voltage set-
OUT1
s on VOUT1_CFG/VTRIM1_CFG can
,
OUT1
IN_01
2
C/
Rev. 0
17