Datasheet

Features Applications
Eight high-voltage input channels (36V, max)
On-chip 8-to-1 serialization with SPI interface
On-chip 5V regulator
Isolated power and data
Small printed circuit board (PCB) area
Device drivers
Example C source code
Pmod
™
-compatible form factor
Building automation
Digital input modules for PLCs
Industrial automation
Motor control
Process automation
Detailed Description of Hardware
The Pmod specification allows for both 3.3V and 5V modules as well as various pin
assignments. This module works with either 3.3V or 5V supply voltages and uses the SPI pin
assignments as illustrated.
The power requirements are shown in Table 1. The currently supported platforms and ports are
shown in Table 2.
Table 1. Power Requirements for the Corona Subsystem Reference Design
Power
Type
Jumper
Shunt
Power
Name
Input Voltage
(V)
Input Current (mA,
typ)
Isolated
power
JU1: 1–2
U3 VCAA
3.3 19.4
5 27.2
U1
VCC24V
12 13.6
24 14.5
Field
power
JU1: 2-3
U3 VCAA
3.3 19.4
5 27.2
U1
VCC24V
12 8.2
24 8.2
Table 2. Supported Platforms and Ports
Supported Platforms Ports
Nexys
™
3 platform (Spartan
®
-6)
JA1
ZedBoard
™
platform (Zynq
®
-7020)
JA1
The Corona subsystem is an isolated, octal, digital input translator/serializer. The design includes an octal, digital input
translator/serializer (MAX31911), an H-bridge transformer driver (MAX13256), and a six-channel digital isolator (MAX14850).
The MAX31911 (U1) industrial interface serializer translates, conditions, and serializes the 24V digital output of sensors and
switches used in industrial, process, and building automation to CMOS-compatible signals required by microcontrollers. It provides
the front-end interface circuit of a PLC digital input module. The device features integrated current limiting, lowpass filtering, and
channel serialization. Input current limiting allows a significant reduction in power consumed from the field voltage supply as
compared to traditional discrete resistor-divider implementations. Selectable on-chip lowpass filters allow flexible debouncing and
filtering of sensor outputs based on the application. On-chip serialization allows a large reduction in the number of optocouplers
used for isolation. For enhanced robustness with respect to high-frequency noise and fast electrical transients, a multibit CRC code
is generated and transmitted through the SPI port for each 8 bits of data. The on-chip 5V voltage regulator can be used to power
external optocouplers, digital isolators, or other external 5V circuitry.
The MAX13256 (U2) provides an isolated, functional insulation class power solution that accepts an 7.6V to 36V DC supply, and
converts it to an isolated 7V to 36V DC supply with an off-the-shelf TGMR-501V6LF Halo
®
transformer with a 1:1 primary to
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