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LTC4215 Datasheet(PDF) 11 Page - Linear Technology

Part # LTC4215
Description  Wide Range I2C Power Monitor Rail-to-Rail Input Range: 0V to 80V
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4215 Datasheet(HTML) 11 Page - Linear Technology

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LTC2945
11
2945f
secondary supply connected to the VDD pin as shown in
Figure 2b. The SENSE pins can be biased independent of
the part’s supply voltage. Alternatively, if a low voltage
supply is present it can be connected to the INTVCC pin
as shown in Figure 2c to minimize on-chip power dissipa-
tion. When INTVCC is powered from a secondary supply,
connect VDD to INTVCC.
For supply voltages above 80V, the shunt regulator at
INTVCC can be used in both high and low side configura-
tions to provide power to the LTC2945 through an exter-
nal shunt resistor, RSHUNT. Figure 3a shows a high side
power monitor with an input monitoring range beyond
80V in a high side shunt regulator configuration. The
device ground is separated from ground through RSHUNT
and clamped at 6.3V below the input supply. Note that
due to the different ground levels, the I2C signals from
the part need to be level shifted for communication with
other ground referenced components. Figure 3b shows a
high side rail-to-rail power monitor which derives power
from a greater than 80V secondary supply. The voltage
at INTVCC is clamped at 6.3V above ground in a low side
shunt regulator configuration to power the part. In low side
power monitors, the device ground and the current sense
inputs are connected to the negative terminal of the input
supply as shown in Figure 3c. The low side shunt regulator
configuration allows operation with input supplies above
80V by clamping the voltage at INTVCC. RSHUNT should
be sized according to the following equation:
VS(MAX) – 5.9V
35mA
≤R
SHUNT
VS(MIN) – 6.7V
1mA
+I
LOAD(MAX )
where VS(MAX) and VS(MIN) are the operating maximum
and minimum of the supply. ILOAD(MAX) is the maximum
external current load that is connected to the shunt regula-
tor. The shunt resistor must also be rated to safely dissipate
the worst-case power. As an example, consider the –48V
Telecom System where the supply operates from –36V to
–72V and the shunt regulator is used to supply an external
load up to 4mA. RSHUNT needs to be between 1.9k and
5.9k according to the above equation, and for reduced
power dissipation, a larger resistance is advantageous.
The worst-case power dissipated in an RSHUNT of 5.4k is
calculated to be 0.8W. So, three 0.5W rated 1.8k resistors
in series would suffice for this example.
APPLICATIONS INFORMATION
out of the six total ADC data registers (ΔSENSE MSB/LSB,
VIN MSB/LSB, and ADIN MSB/LSB), with the eight MSBs
in the first register and the four LSBs in the second (see
Table 2). The lowest 4 bits in the LSB registers are set to 0.
These data registers are updated immediately following the
corresponding ADC conversion, giving an effective refresh
rate of 7.5Hz in continuous scan mode.
The data converter also features a snapshot mode which
makes a measurement of a single selected voltage (either
ΔSENSE, VDD or VSENSE+, or VADIN). To make a snapshot
measurement, set CONTROL register bit A7 and write
the two-bit code of the desired ADC channel to A6 and
A5 (Table 3) using a Write Byte command. When the
Write Byte command is completed, the ADC converts the
selected voltage and the Busy Bit (A3 in the CONTROL
register) will be set to indicate that the conversion is in
progress. After completing the conversion, the ADC will
halt and the Busy Bit will reset to indicate that the data is
ready. To make another snapshot measurement, rewrite
the CONTROL register.
Flexible Power Supply to LTC2945
The LTC2945 can be externally configured to flexibly derive
power from a wide range of supplies. The LTC2945 includes
an onboard linear regulator to power the low-voltage internal
circuitryconnectedtotheINTVCCpinfromhighVDDvoltages.
The regulator operates with VDD voltages from 4V to 80V,
and produces a 5V output capable of supplying 10mA at the
INTVCC pin when VDD is greater than 7V. The regulator is
disabled when die temperature rises above 150°C, and the
outputisprotectedagainstaccidentalshorts.Bypasscapaci-
tors between 0.1μF and 1μF at both the VDD and INTVCC pins
are recommended for optimal transient performance. Note
that operation with high VDD voltages can cause significant
powerdissipation,andcareisrequiredtoensuretheoperating
junctiontemperaturestaysbelow125°C.Forimprovedpower
dissipation,usetheQFNpackageandsoldertheexposedpad
to a large copper region for improved thermal resistance.
Figure 2a shows the LTC2945 being used to monitor an
input supply that ranges from 4V to 80V. No secondary
supply is needed since VDD can be connected directly to
the input supply. If the LTC2945 is used to monitor an input
supply of 0V to 80V, it can derive power from a wide range
(1)


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