ACPL-7970-500E Avago Technologies US Inc., ACPL-7970-500E Datasheet - Page 14

• Manufacturer Part Number: ACPL-7970-500E
• Description: IsolatedSigmaDelta Mod, TR+IEC+LF
• Manufacturer: Avago Technologies US Inc.
• Series: -r
• Type: Sigma-Delta Modulatorr

Specifications of ACPL-7970-500E

• Operating Supply Voltage: 5.5 V
• Supply Current: 8 mA at 5 V
• Operating Temperature Range: - 40 C to + 105 C
• Mounting Style: SMD/SMT
• Package / Case: DIP-8 Gull Wing
• Input Voltage Range (max): + 200 mV
• Voltage - Isolation: 5000Vrms
• Input Type: DC
• Voltage - Supply: 3 V ~ 5.5 V, 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Lead Free Status / Rohs Status: Details

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
and Microwire
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 Ps),
offset calibration, fast over-range (over-current, or short
circuits) detection, and adjustable threshold detection.
Figure 18. Typical application circuit with the HCPL-0872.
14
Figure 19. Typical application circuit for motor phase current sensing.
CURRENT
INPUT
R
SHUNT
MOTOR
£
protocols, allowing direct connection to a
1 F
+
ISOLATED
GND1
R
5 V
SENSE
0.1 F
–
HV+
HV–
V
V
V
GND1
DD1
IN+
IN–
ISOLATION
ACPL-7970
BARRIER
CIRCUIT
DRIVE
GATE
R2 4.3
FLOATING
POSITIVE SUPPLY
MDAT
MCLK
GND2
V
£
DD2
, QSPI
5.1 V
D1
100 nF
0.1
ISOLATED
£
F
C2
GND2
NON-
,
5 V
GND1
R1
C1a 1 F
C1b 0.1 F
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.
1 F
V
MCLK1
MDAT1
GND
DD
HCPL-0872
V
V
V
GND1
DD1
IN+
IN–
ACPL-7970
ISOLATION
BARRIER
SDAT
SCLK
CS
MDAT
MCLK
GND2
V
DD2
3-WIRE
SERIAL
INTERFACE
ISOLATED
5 V/3.3 V
GND2
NON-
C3a
0.1 F
C3b
1 F