ISL28023 Datasheet, PDF (27/55 Pages) Intersil Corporation – Bidirectional current sensing

ISL28023
Typical Performance Curves T_A = +25°C, VCC = 3.3V, VINP = VBUS = 12V, AUXP = AUXV = 3V,
VSHUNT = VAUXSHUNT = 80mV, Conversion Time: Aux = Primary = 2.05ms, Internal AVG Aux = Primary = 128; unless otherwise specified. (Continued)
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SAMPLE SIZE = 1024
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ADC TIMING = 2.048ms
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5
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2
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0 _{0 40 80 120 160 200 240 280 320 360 400 440 480 520}
INTERNAL AVERAGING
FIGURE 93. AUXILIARY SHUNT STABILITY: STDEV vs INTERNAL
AVERAGING
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SAMPLE SIZE = 1024
ADC TIMING = 2.048ms
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15
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5
0
0 40 80 120 160 200 240 280 320 360 400 440 480 520
INTERNAL AVERAGING
FIGURE 94. AUXILIARY SHUNT STABILITY: RANGE vs INTERNAL
AVERAGING
Overview
The ISL28023 is a digital current, voltage and power monitoring
device for high and low-side power monitoring in positive and
negative voltage applications.
The Digital Power Monitor (DPM) requires an external shunt
resistor to enable current measurements. The shunt resistor
translates the bus current to a voltage. The DPM measures the
voltage across the shunt resistors and reports the measured
value out digitally via an I²C interface. A register within the DPM
is reserved to store the value of the shunt resistor. The stored
current sense resistor value allows the DPM to output a current
value to an external digital device.
The ISL28023 has two channels, which allow the user to monitor
the voltage, current and power on two power supply rails. The two
channels for the DPM consist of a primary channel and an
auxiliary channel. The primary channel will allow and measure
voltages from 0V to 60V or from 0V to 16.384V, depending on
the option of the ISL28023. The auxiliary channel can tolerate
and measure voltage from 0V to V_CC.
The ISL28023 has continuous fault detection for the primary
channel. The DPM can be configured to set an alert in the
instance of an overvoltage, undervoltage and/or overcurrent
event. The response time of the alert is 500ns from the event.
The ISL28023 has a temperature sensor with fault detection.
An 8-bit margin DAC, controllable through I²C communication, is
incorporated into the DPM. The voltage margining feature allows
for the adjustment of the regulated voltage to the load. The
margin DAC can help in proving the load robustness versus the
applied supply voltage.
The ISL28023 offers a 3.3V voltage regulator that can be used to
power the chip in addition to low power peripheral circuitry. The
DPM has an I²C power pin that allows the I²C master to set the
digital communication supply voltage to the chip. The operating
supply voltage for the DPM ranges from 3V to 5.5V. The device
will accept I²C supply voltages between 1.2V and 5.5V.
The ISL28023 accepts SMBus protocols up to 3.4MHz. The
device is PMBus compliant up to 400MHz. The device has Packet
Error Code (PEC) functionality. The PEC protocol uses an 8-bit
cyclic redundance check (CRC-8) represented by the polynomial
x⁸+x²+x¹+1. The ISL28023 can be configured for up to 55
unique slave addresses using 3 address select bits. The large
amount of addressing allows 55 parts to communicate on a
single I²C bus. It also gives the designer the flexibility to select a
unique address when another slave address conflicts with the
DPM on the same I²C bus.
Pin Descriptions
VBUS
VBUS is the power bus voltage input pin. The pin should be
connected to the desired power supply bus to be monitored. The
voltage range for the pin is from 0V to 60V or 0V to 16V
depending on the ISL28023 version.
VINP
VINP is the shunt voltage monitor positive input pin. The pin
connects to the most positive voltage of the current shunt
resistor. The voltage range for the pin is from 0V to 60V or 0V to
16V depending on the ISL28023 version. The maximum
measurable voltage differential between VINP and VINM is
80mV.
VINM
VINM is the shunt voltage monitor negative input pin. The pin
connects to the most negative voltage of the current shunt resistor.
The voltage range for the pin is from 0V to 60V or 0V to 16V
depending on the ISL28023 version. The maximum measurable
voltage differential between VINP and VINM is 80mV.
AUXV
AUXV is the power bus voltage input pin. The pin should be
connected to the desired power supply bus to be monitored. The
voltage range for the pin is from 0V to V_CC.
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FN8389.5
March 18, 2016