GPIO66 datasheet(23/60 Pages) MICROCHIP

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 2016-2018 Microchip Technology Inc.

DS00002236D-page 23

USB5806

5.0

MODES OF OPERATION

The device provides two main modes of operation: Standby Mode and Hub Mode. These modes are controlled via the

RESET_N pin, as shown in Table 5-1.

The flowchart in Figure 5-1 details the modes of operation and how the device traverses through the Hub Mode stages

(shown in bold). The remaining sub-sections provide more detail on each stage of operation.

TABLE 5-1:

MODES OF OPERATION

RESET_N Input

Summary

Standby Mode: This is the lowest power mode of the device. No functions are active

other than monitoring the RESET_N input. All port interfaces are high impedance and

the PLL is halted. Refer to Section 8.4.2, External Chip Reset (RESET_N) for additional

information on RESET_N.

Hub (Normal) Mode: The device operates as a configurable USB hub with battery

charger detection. This mode has various sub-modes of operation, as detailed in

Figure 5-1. Power consumption is based on the number of active ports, their speed,

and amount of data transferred.

FIGURE 5-1:

HUB BOOT FLOWCHART

(OTP_CFG)

NORMAL operation

(SOC_CFG)

YES

(STRAP)

SPI

Signature

Present?

YES

Load Config from

Internal ROM

(CFG_RD)

Modify Config

Based on OTP

YES

(SPI_INIT)

CFG_STRAP for

SMBus Slave?

SOC Done?

Do SMBus or I2C

initialization

Combine OTP

Config Data

Run from

External ROM

Hub Connect

Load Config from

External ROM

(Ext_CFG

_RD)

Modify Config

Based on psuedo-

OTP

RESET_N deasserted

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