Digi NS9210 I2C interface

50 NS9210 Processor Module Hardware Reference

Chapter 2

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I2C interface

I2C header The I²C interface has only one device connected to the bus on the development

board - an I/O expander (see next paragraph). Otherwise, additional I²C devices

(like EEPROMs) can be connected to the module by using I²C header X15. The

pinning of this header is provided below.

I2C digital I/O

expansion The development board provides a 3.81mm (1.50") green terminal block, X44, for

additional digital I/Os. The I2C I/O port chip is on-chip ESD-protected, 5V tolerant,

and provides an open drain interrupt output.

I2C digital I/Os, X 4 4I2C header, X15

Pin Signal

1 I2C_SDA/GPIO103

2 +3.3V

3 I2C_SCL/GPIO102

4 GND

Contents

Main Page Contents . . . . . . . Page Page Page Digi information Page About the Module T Features and functionality Module pinout Pinout legend: Type X1 pinout Page Page Page X2 pinout Page Page Page Page Page Page Page Configuration pins CPU Configuration pins Module Clock generation Boot process Chip selects SDRAM banks Multiplexed GPIO pins Page Page Page Page Page Interfaces Power About the Development Board T Page Page User interface Switches and pushbuttons Page Serial Port B MEI configuration switches, S1 Use S1 to configure the line interface for serial port B MEI: Jumpers Jumper functions Battery and Battery Holder LEDs Page Serial UART ports Page Page Page I2C interface The I/O expander is a Philips PCA9554D at I2C address 0x20 / 0x21. The pins are allocated as shown: SPI interface Pin allocation SPI connector pins are allocated as shown: Current Measurement Option JTAG interface PoE module connectors - IEEE802.3af Page Ethernet interface RJ-45 pin allocation, X19 RJ-45 connector pins are configured as shown: Peripheral (expansion) headers Page Module and test connectors X10 pinout *USB signals are reserved for future use. X11 pinout *USB signals are reserved for future use. X20 pinout X21 pinout Page Appendix A:Specifications T Environmental specifications Mechanical specifications Safety statements A Power requirements Typical module current / power measurements Typical power save module / JumpStart board current / power consumption measurements Page Layout recommendation BOTTOM View TOP View SIDE View Page Reset and edge sensitive input timing requirements t Page Appendix B:Certifications T FCC Part 15 Class B Radio Frequency Interface (RFI) (FCC 15.105) Labeling Requirements (FCC 15.19) B Modifications (FCC 15.21) Industry Canada Declaration of Conformity B International EMC Standards The NS9210 Processor Module meets the following standards: