Datasheet ISL32704E (Intersil) - 10

link to page 10 link to page 10 link to page 10 link to page 10 link to page 10 ISL32704E TABLE 3. RCLAMP0512 TVS FEATURES (Continued) the GND2 pins between Pins 9 and 15. This allows for increased layout flexibility. PARAMETER SYMBOL VALUE UNIT The wide-body version also provides an isolated DE output, Surge (IEC61000-4-5) VSURGE ±1.3 kV ISODE, that can be used in PROFIBUS™ applications to monitor Junction Capacitance CJ 3 pF the state of the isolated drive enable node. Form Factor - 1 x 0.6 mm The QSOP version (ISL32704EIAZ) is designed for application flexibility and maximum space saving in dense PCB designs. This The TVS is implemented between the bus lines and isolated package provides an isolated DE output (ISODE) and a separate ground (GND2). DE input on the bus side (XDE). XDE can be used to enable the Since transient voltages on the bus lines are referenced to Earth driver from the bus side, or when connected to ISODE, enable the potential, aka Protective Earth (PE), a high-voltage capacitor (C driver from the DE input on the controller side. HV) is inserted between GND2 and PE, providing a low-impedance path Two separate output supply pins are available, VDD2 for the for high-frequency transients. isolation module and VDD2X for the transceiver module. Both Note that the connection from the PE point on the isolated side pins should be connected externally for normal operation, or can to the PE point on the non-isolated side (Earth) is usually made be used separately for testing and troubleshooting. via the metal chassis of the equipment, or via a short, thick wire The QSOP version also has an “ISOR” output that is isolated from of low-inductance. the receiver output “R” on the controller side. This pin is used for A high-voltage resistor (R testing and usually left open, but it could be used for bus-side HV) is added in parallel to CHV to prevent the build-up of static charges on floating grounds (GND2) and monitoring purposes in special circumstances. cable shields (typically used in Profibus). The bill of materials for Figures 10 and 11 show the typical device connections for both the circuit in Figure 9 is listed in Table 4. package versions.
VS-ISO V 3.3V 5V S ISOLATION 100n 100n BARRIER 1 16 9 A VDD1 VDD2 MCU / ISL32704 10 B UART 1 2 5 DE ISODE 10 SHIELD 1.09k TVS 3 A 12 6 D GND 127R PE C 3 R HV RHV B 13 4 RE PE 1.09k GND1 GND2 Non-isolated Ground 2,8 9,15 Isolated Ground, Floating RS-485 Common Protective Earth Ground, Equipment Safety Ground ISL32704EIBZ
FIGURE 9. TRANSIENT PROTECTION FOR ISL32704E FIGURE 10. TYPICAL WB-SOIC TRANSCEIVER CONNECTIONS
3.3V 5V ISOLATION
TABLE 4. BOM FOR CIRCUIT IN Figure 9
100n 100n BARRIER 1 11 16
NAME FUNCTION ORDER NO. VENDOR
VDD1 VDD2X VDD2
TVS 170W (8µs, 20µs) RCLAMP0512TQ SEMTECH 2-LINE PROTECTOR
6 D ISODE 15 XDE 12 1.09k
CHV 4.7nF, 2kV, 10% 1812B472K202NT NOVACAP CAPACITOR
A 9 5 DE
RHV 1MΩ, 2kV, 5% HVC12061M0JT3 TT-ELECTRONICS RESISTOR
127R 2 R B 10
Pinout Differences Between Packages
4 RE ISOR 13
The wide-body version (ISL32704EIBZ) has a single output power
1.09k GND1 GND2
supply pin, VDD2, supplying the bus side of the isolation module
3 14
and the transceiver module. This package also provides two ground pins for each supply. The
ISL32704EIAZ
GND1 pins are internally connected between Pins 2 and 8 and FIGURE 11. TYPICAL QSOP TRANSCEIVER CONNECTIONS FN8860 Rev.3.00 Page 10 of 13 Mar 29, 2017 Document Outline Related Literature Features Applications Ordering Information Pin Configurations Truth Table Truth Table Pin Descriptions Typical Operating Circuits Absolute Maximum Ratings (Note 16) Thermal Information Recommended Operating Conditions Electrical Specifications Insulation Specifications Magnetic Field Immunity (Note 16) Safety and Approvals VDE V 0884-11 (Certification Pending) UL 1577 Electromagnetic Compatibility Application Information RS-485 and Isolation Digital Isolator Principle GMR Resistor in Detail Low Emissions Low EMI Susceptibility Receiver (Rx) Features Driver (Tx) Features Built-In Driver Overload Protection Dynamic Power Consumption Power Supply Decoupling DC Correctness Data Rate, Cables, and Terminations Transient Protection Pinout Differences Between Packages Revision History About Intersil Package Outline Drawing M16.15B M16.3A