USB5734 datasheet(34/61 Pages) MICROCHIP

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USB5734

DS00001854D-page 34

 2015-2016 Microchip Technology Inc.

7.0

DEVICE INTERFACES

The USB5734 provides multiple interfaces for configuration and external memory access. This section details the vari-

ous device interfaces and their usage:

• SPI Master Interface

• SMBus Slave Interface

• I2C Bridge Interface

• Two Pin Serial Port (UART) Interface

7.1

SPI Master Interface

The device is capable of code execution from an external SPI ROM. When configured for SPI Mode, on power up the

firmware looks for an external SPI flash device that contains a valid signature of 2DFU (device firmware upgrade) begin-

ning at address 0xFFFA. If a valid signature is found, then the external ROM is enabled and the code execution begins

at address 0x0000 in the external SPI device. If a valid signature is not found, then execution continues from internal

ROM.

7.2

SMBus Slave Interface

The device includes an integrated SMBus slave interface, which can be used to access internal device run time registers

or program the internal OTP memory. SMBus slave detection is accomplished by detection of pull-up resistors on both

the SMDAT and SMCLK signals. Refer to Section 3.4.1, "SPI/SMBus/I2C/UART Configuration (I2C_SLV_CFG[1:0])"

for additional information.

7.3

I2C Bridge Interface

The I2C Bridge interface implements a subset of the I2C Master Specification (Please refer to the Philips Semiconductor

Standard I2C-Bus Specification

for details on I2C bus protocols). The I2C Bridge conforms to the Fast-Mode I2C Spec-

ification (400 kbit/s transfer rate and 7-bit addressing) for protocol and electrical compatibility. The device acts as the

master and generates the serial clock SCL, controls the bus access (determines which device acts as the transmitter

and which device acts as the receiver), and generates the START and STOP conditions. The I2C Bridge interface fre-

quency is configurable through the I2C Bridging commands. I2C Bridge frequencies are derived from the formula

626KHz/n, where n is any integer from 1 to 256. Refer to Section 3.4.1, "SPI/SMBus/I2C/UART Configuration

(I2C_SLV_CFG[1:0])" for additional information.

Note:

For details on how to enable each interface, refer to Section 3.4.1, "SPI/SMBus/I2C/UART Configuration

(I2C_SLV_CFG[1:0])".

For information on device connections, refer to Section 4.0, "Device Connections". For information on

device configuration, refer to Section 6.0, "Device Configuration".

Microchip provides a comprehensive software programming tool, Pro-Touch, for configuring the USB5734

functions, registers and OTP memory. All configuration is to be performed via the Pro-Touch programming

tool. For additional information on the Pro-Touch programming tool, refer to Software Libraries within Micro-

chip USB5734 product page at www.microchip.com/USB5734.

Note:

For SPI timing information, refer to Section 9.6.7, "SPI Timing".

Note:

All device configuration must be performed via the Pro-Touch Programming Tool. For additional information

on the Pro-Touch programming tool, refer to Software Libraries within Microchip USB5734 product page at

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