USB5807C datasheet(27/56 Pages) MICROCHIP

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2019 - 2021 Microchip Technology Inc.

DS00003182B-page 27

USB5807C

7.0

DEVICE INTERFACES

The USB5807C provides multiple interfaces for configuration and external memory access. This section details the var-

ious device interfaces and their usage:

• SPI Master Interface

• SMBus Slave 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 setting the

CFG_STRAP in the correct

configuration followed by detection of pull-up resistors on both the

SMDAT and SMCLK signals during the hub’s boot-

up sequence. Refer to Section 3.5.1, CFG_STRAP Configuration for additional information.

Note:

For details on how to enable each interface, refer to Section 3.5, Configuration Straps and Programmable

Functions.

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-Touch2, for configuring the

USB5807C functions, registers and OTP memory. All configuration is to be performed via the Pro-Touch2

programming tool. For additional information on the Pro-Touch2 programming tool, refer to Software Librar-

ies within Microchip USB5807C product page at www.microchip.com/USB5807C.

Note:

For SPI timing information, refer to Section 10.6.7, SPI Timing.

Note:

All configuration is to be performed via the Pro-Touch2 programming tool. For additional information on the

Pro-Touch2 programming tool, refer to Software Libraries within Microchip USB5807C product page at

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