Datasheet

I2C Interfaces

August 2016 Intel® Joule™ Datasheet

Document number: 566641 rev. 1.0 Page 24

8 I2C Interfaces

The Intel® Joule™ module provides 7 master I2C interfaces.

8.1 I2C features

· ISH_I2C_0 and ISH_I2C_1 support standard, full and fast modes with a maximum data speed of 1.7Mbps

· I2C_0 through I2C_6 support standard, full, fast and high-speed modes with a maximum data speed of 3.4Mbps

·I

C master mode only; no support for multi-master mode

· Clock stretching by slave devices is possible

· Both 7-bit and 10-bit addressing modes are supported

8.2 I2C default configuration

8.3 I2C signal group specifications

Refer to the Intel® Joule™ Expansion Board Design Guide for the specifications and PCB routing guidance for this interface.

9 Clock Specifications

Two module clocks, 19.2 MHz (CLK_19P2M) and 32.768 kHz (PMIC_SLPCLK_1) are routed out through the board-to-board

connectors for use on expansion boards.

Refer to the Intel® Joule™ Expansion Board Design Guide for the specifications and PCB routing guidance of the clocks.

9.1 RTC backup battery

A backup power source is required for the RTC to operate robustly by preventing RTC data losses during unexpected power

events. Implementation options are provided in the Intel® Joule™ Expansion Board Design Guide (listed in Section 1.2).

The most common solution is a non-rechargeable coin-cell battery connected to V_RTC at module connector J6, pin 11.

Table 12 I2C mapping

Name Description/Usage Source Destination

I2C_0 Dedicated EEPROM on expansion board (holds configuration table) LPSS Routed on module J7 for expansion board use

I2C_1 General usage LPSS Routed on module J7 for expansion board use

I2C_2 General usage LPSS Routed on module J7 for expansion board use

I2C_3 Camera support for DPHY 1.1 LPSS Module Camera Connector - JCAM2

I2C_4 Camera support for DPHY 1.2 & 1.1 LPSS Module Camera Connector - JCAM1

ISH_I2C_0 General usage; mapped to LPSS I2C_5 LPSS Routed on module J6 for expansion board use

ISH_I2C_1 General usage; mapped to LPSS I2C_6 LPSS Routed on module J6 for expansion board use