USB5744SLASH2G datasheet(20/49 Pages) MICROCHIP

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USB5744

DS00001855D-page 20

 2015-2016 Microchip Technology Inc.

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 details 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 8.2.2, "External Chip Reset (RESET_N)" for addi-

tional 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 received.

FIGURE 5-1:

HUB MODE FLOWCHART

Combine OTP

Config Data

In SPI Mode &

Ext. SPI ROM

present?

YES

Run From

External SPI ROM

(SPI_INIT)

SMBus Host Present?

RESET_N deasserted

Modify Config

Based on Config

Straps

(CFG_RD)

Load Config from

Internal ROM

YES

(STRAP)

Perform SMBus/I

Initialization

SOC Done?

YES

(SOC_CFG)

(OTP_CFG)

Hub Connect

(Hub.Connect)

Normal operation

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