ISL28023 Datasheet, PDF (1/55 Pages) Intersil Corporation – Bidirectional current sensing

DATASHEET
Precision Digital Power Monitor with Margining
ISL28023
The ISL28023 is a bidirectional high-side and low-side digital
current sense and voltage monitor with a serial interface. The
device monitors power supply current, voltage and provides
the digital results along with calculated power. The ISL28023
provides tight accuracy of 0.05% for both voltage and current
monitoring. The auxiliary input provides an additional power
monitor function.
The V_CC power can either be externally supplied or internally
regulated, which allows the ISL28023 to handle a
common-mode input voltage range from 0V to 60V. The wide
range permits the device to handle telecom, automotive and
industrial applications with minimal external circuitry.
An 8-bit voltage DAC enables a DC/DC converter output voltage
margining. Fault indication includes a Bus Voltage window and
overcurrent fast fault logic indication.
The ISL28023 serial interface is PMBus compatible and
operates down to 1.2V voltage. It draws an average current of
just 800µA and is available in the space saving 24 Ld QFN
4mmx4mm package. The part operates across the full
industrial temperature range from -40°C to +125°C.
Related Literature
AN1955, “Design Ideas for Intersil Digital Power Monitors”
AN1932, “ISL28023 Precision Digital Power Monitor
Evaluation Kit”
Features
• Bus voltage sense range . . . . . . . . . . . . . . . . . . . . . . 0V to 60V
• Voltage gain error. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.05%
• Current gain error. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.05%
• Internal temperature sensor accuracy . . . . . . . . . . . . +1.0°C
• High or low (RTN) side sensing
• Bidirectional current sensing
• Auxiliary low voltage channel
• ∆∑ADC, 16-bit native resolution
• Programmable averaging modes
• Internal 3.3V regulator
• Internal temperature sense
• Overvoltage/undervoltage and current fault monitoring with
500ns detection delay
• 8-bit voltage output DAC
• I²C/SMBus/PMBus interface that handles 1.2V supply
Applications
• Data processing servers
• DC power distribution
• Telecom equipment
• Portable communication equipment
• DC/DC, AC/DC converters
• Many I²C DAC and ADC with alert applications
VIN = 4.5V 36V
RSH
VIN
SMBALERT1
VINP
ISL28023
3.3V
Vreg
VIN
ISL85415
Ext_Temp
Place Diode
Near RSH
Phase
Lo
0.1µF
BOOT
R₂
PG
En ^FB
R₃
To SMBAlert1
VINM
VBUS
AUXP
AUXM ^mp
AUXV
DAC OUT
R₁
8-Bit
DAC
ADC
16-Bit
PMBus
REG
MAP
Temp
Sense
VOUT = 0.6 +
(0.6 – DAC OUT)
* R2/R1
VIN
GPIO
MCU
GPIO/Int
SCL
SDA
FIGURE 1. APPLICATION DIAGRAM
VCC
GND
A0
A1
A2
SCL
SDA
SMBALERT2
I2CVCC
March 18, 2016
1
FN8389.5
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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