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Data Sheet
ADM1075
The ADM1075 returns a single value corresponding to the
–48V SIDE
ISOLATED SIDE
average voltage and current measured. When configured for
(PRIMARY)
ADuM1250
(SECONDARY)
continuous mode, the power monitor continuously samples
voltage and current, making the most recent sample available
to be read. The ADC runs in continuous mode by default at
power-up.
VDD1
100nF
5V
–48V
10k?
SDA
10k?
SCL
VDD1
SCL2
SCL1
VDD2
SDA2
SCL2
SDA_ISO
SCL_ISO
5V_ISO
100nF
GND_ISO
The single-shot mode can be triggered in a number of ways.
The simplest is by selecting the single-shot mode using the
–48V
GND1
GND2
GND_ISO
PMON_CONFIG command and writing to the CONVERT bit
using the PMON_CONTROL command. The CONVERT bit
can also be written as part of a PMBus group command. Using a
group command allows multiple devices to be written to as part
of the same I 2 C bus transaction, with all devices executing the
command when the stop condition appears on the bus. In this
way, several devices can be triggered to sample at the same time.
When the GPO1/ALERT1/CONV pin is set to the convert
(CONV) mode, an external hardware signal can be used to
trigger the single-shot sampling of one or more parts at the
same time.
Each time a current sense and input voltage measurement is
taken, a power calculation is performed, multiplying the two
measurements together. This can be read from the device using
the READ_PIN command, returning the input power.
At the same time, the calculated power value is added to a
power accumulator register that may increment a rollover
counter if the value exceeds the maximum accumulator value,
and that also increments a power sample counter.
The power accumulator and power sample counter are read
back using the same READ_EIN command to ensure that the
accumulated value and sample count are from the same point in
time. The bus host reading the data assigns a timestamp to show
when the data is read. By calculating the time difference between
consecutive uses of READ_EIN and determining the delta in
power consumed, it is possible for the host to determine the
total energy consumed over that period.
ISOLATION
Isolation is usually required in ?48 V systems because there can
be a large voltage difference between different ground planes in
Figure 54. ADuM1250 I 2 C Isolation
The ADuM1250 and ADuM3200 must be powered from both the
primary and secondary sides. The ADuM5404 only needs to be
powered from the secondary side and can provide power across
the isolation barrier via the integrated dc-to-dc converter. There-
fore, the ADuM5404 can be used to power the primary side of
the ADuM1250 if both are used on the board. Some extra care
is required if using the ADuM5404 to power the ADuM3200 . If
the power at the secondary side is enabled by the ADM1075 , the
iso Power solution may not work. Because iso Power is unpowered
in this case, the ADuM3200 outputs are in an undefined state. If
the SHDN input comes from the ADuM3200 , it may be held
low, and the ADM1075 never turns on the FET or enables
power at the secondary side.
iso Power uses high frequency switching elements to transfer
power through its transformer. Special precautions must be
taken during printed circuit board (PCB) layout to meet
emissions standards. See the AN-0971 Application Note for
board layout recommendations.
Powering the i Couplers from the secondary side is usually
straightforward because there is often a suitable voltage rail
available. However, there is not always a suitable voltage rail
available on the primary side (?48 V side). If the ADuM5404 is
not used on the system, the ADuM1250 can be powered on the
primary side in a number of different ways.
If a voltage rail is available on the primary side (3.3 V or 5 V
referenced to VEE), that can be used to power the chip directly.
Otherwise, the ADM1075 shunt voltage and/or the ?48 V
supply can be regulated down to power the part. A simple
the system. The ADM1075 is referenced to ?48 V, whereas the
MCU is usually referenced to 0 V. In almost all cases, the I 2 C signals
must be isolated. Any other ADM1075 digital input and output
signals that go to or come from the MCU must also be isolated.
12V (SHUNT)
20k ?
–48V RTN
1k?
0.33W
Analog Devices, Inc., provide a range of digital isolators using
i Coupler? technology. i Coupler technology is based on chip
scale transformers rather than the LEDs and photodiodes used
20k
6V
5V AUX
in optocouplers. The ADuM1250 is a dual I 2 C isolator and can
be used in conjunction with the ADM1075 for I 2 C isolation.
–48V
1μF
In cases where more digital signals need to be isolated, the
ADuM3200 is a dual-channel digital isolator whereas the
ADuM5404 is a quad-channel isolator with iso Power?, an
integrated, isolated dc-to-dc converter.
Rev. C | Page 27 of 52
–48V
Figure 55. Powering i Coupler from ?48 V Supply
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