ACPL-7970 Просмотр технического описания (PDF) - Avago Technologies
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ACPL-7970 Datasheet PDF : 18 Pages
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Digital Interface IC
The HCPL-0872 Digital Interface IC (SO-16 package) is a
digital filter that converts the single-bit data stream from
the modulator into 15-bit output words and provides a
serial output interface that is compatible with SPI, QSPI,
and Microwire protocols, allowing direct connection to a
microcontroller. Instead of a digital filter implemented in
software, the HCPL-0872 can be used together with the
ACPL-7970 to form an isolated programmable two-chip
A/D converter.
Available in an SO-16 surface-mount package, the Digital
Interface IC has features include five different conversion
modes (combinations of speed and resolution), three
different pre-trigger modes (allows conversion time < 1 ms),
offset calibration, fast over-range (over-current, or short
circuits) detection, and adjustable threshold detection.
Programmable features are configured via the Serial Con-
figuration port. A second multiplexed input is available to
allow measurements with a second isolated modulator
without additional hardware. Refer to the HCPL-0872 data
sheet for details.
Notes:
SPI and QSPI are trademarks of Motorola Corp.
Microwire is a trademark of National Semiconductor Inc.
Application Information
Digital Current Sensing Circuit
Figure 19 shows a typical application circuit for motor
control phase current sensing. By choosing the appro-
priate shunt resistance, a wide range of current can be
monitored, from less than 1 A to more than 100 A.
ISOLATED
5V
ISOLATION
BARRIER
NON-
ISOLATED
5V
INPUT
CURRENT
RSHUNT
VDD1
VIN+
0.1 µF
1 µF
VIN–
VDD2
VDD
SCLK
MCLK
MCLK1
0.1
1 µF
SDAT
µF
MDAT
MDAT1
CS
GND1
GND2
GND1
ACPL-7970
GND2
Figure 18. Typical application circuit with the HCPL-0872.
GND
HCPL-0872
3-WIRE
SERIAL
INTERFACE
MOTOR
HV+
+–
RSENSE
FLOATING
POSITIVE SUPPLY
GATE
DRIVE
CIRCUIT
D1
5.1 V
R2a 22 Ω
R2b 22 Ω
R1
C1a C1b
1 µF 0.1 µF
C2 10 nF
ISOLATION
BARRIER
NON-
ISOLATED
5 V/3.3 V
VDD1
VDD2
VIN+
MCLK
C3a
C3b
VIN–
0.1 µF
1 µF
MDAT
GND1
GND2
HV –
Figure 19. Typical application circuit for motor phase current sensing.
ACPL-7970
GND2
14
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