SLLU367 july   2023 ISO1228

 

  1.   1
  2.   Description
  3.   Features
  4.   4
  5. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  6. 2Hardware
    1. 2.1 Pin Configuration of the ISO1228
    2. 2.2 EVM Board Block Diagram and Image
    3. 2.3 EVM Setup and Operation
      1. 2.3.1 EVM Jumper Settings
  7. 3Hardware Design Files
    1. 3.1 Schematics
    2. 3.2 PCB Layouts
    3. 3.3 Bill of Materials

2.3.1 EVM Jumper Settings

The ISO1228DFBEVM has several configurable jumpers that can be used to modify the behavior of the ISO1228. All jumpers are left open by default, which program the ISO1228 EVM to operate in the parallel interface mode with enabled outputs and digital filtering of 1 ms on the channels. Alternative jumper configurations and the resulting device behaviors are explained below.

The COMM_SEL pin of the ISO1228 controls the output options and is configurable with jumper J4. Table 3-2 describes the available configurations of the COMM_SEL pin.

Table 2-2 Comm_Sel Pin Jumper Descriptions
Jumper Configuration Description
J4 All Pins Open (default) Parallel Interface Mode Enabled (default)
Pin 1-Pin 2 Shorted
(COMM_SEL tied to Ground)		 Parallel Interface Mode Enabled
Pin 2-Pin 3 Shorted
(COMM_SEL tied to VCC1)		 Serial Interface Mode Enabled

The F0 and F1 pins of the ISO1228 control the digital filter settings. Since each pin has three potential states, there are 9 distinct combinations and digital low pass filters. Pin F0 can be configured with jumper J9 and pin F1 can be configured with jumper J10. Table 3-3 describes all potential combinations of pin F0 and F1. The digital filters can also be programmed through the SPI registers. If any SPI filter Enable register bit is flipped, the states of the F0 and F1 pins are ignored.

Table 2-3 F0 and F1 Pin Jumper Descriptions
Option Jumper Configuration Description
1 J9 All Pins Open
(default)		 1 ms Filter Averaging Time (default)
J10 All Pins Open
(default)
2 J9 Pin 1-Pin 2 Shorted
(F0 tied to Ground)		 0 ns Filter Averaging Time
J10 Pin 1-Pin 2 Shorted
(F1 tied to Ground)
3 J9 All Pins Open
(default)		 1 μs Filter Averaging Time
J10 Pin 1-Pin 2 Shorted
(F1 tied to Ground)
4 J9 Pin 2-Pin 3 Shorted
(F0 tied to VCC1)		 10 μs Filter Averaging Time
J10 Pin 1-Pin 2 Shorted
(F1 tied to Ground)
5 J9 Pin 1-Pin 2 Shorted
(F0 tied to Ground)		 200 μs Filter Averaging Time
J10 All Pins Open
(default)
6 J9 Pin 2-Pin 3 Shorted
(F0 tied to VCC1)		 3 ms Filter Averaging Time
J10 All Pins Open
(default)
7 J9 Pin 1-Pin 2 Shorted
(F0 tied to Ground)		 10 ms Filter Averaging Time
J10 Pin 2-Pin 3 Shorted
(F1 tied to VCC1)
8 J9 All Pins Open
(default)		 30 ms Filter Averaging Time
J10 Pin 2-Pin 3 Shorted
(F1 tied to VCC1)
9 J9 Pin 2-Pin 3 Shorted
(F0 tied to VCC1)		 100 ms Filter Averaging Time
J10 Pin 2-Pin 3 Shorted
(F1 tied to VCC1)

The OUT_EN/NC pin of the ISO1228 acts as the output enable control and is configurable with jumper J7. Table 3-4 describes the available configurations of the OUT_EN/NC pin.

Table 2-4 OUT_EN Pin Jumper Description
Jumper Configuration Description
J7 All Pins Open (default) Output Enabled (default)
Pin 1-Pin 2 Shorted
(VOUT_EN/NC tied to Ground)		 Output pins are tri-stated
Pin 2-Pin 3 Shorted
(VOUT_EN/NC tied to VCC1)		 Output Enabled