FX3 datasheet(6/45 Pages) CYPRESS

6 / 45 page

CYUSB301X

Document Number: 001-52136 Rev. *N

Page 6 of 45

OTG Connectivity

In OTG mode, FX3 can be configured to be an A, B, or dual-role

device. It can connect to the following:

■ ACA device

■ Targeted USB peripheral

■ SRP-capable USB peripheral

■ HNP-capable USB peripheral

■ OTG host

■ HNP-capable host

■ OTG device

ReNumeration

Because of FX3's soft configuration, one chip can take on the

identities of multiple distinct USB devices.

When first plugged into USB, FX3 enumerates automatically with

the Cypress Vendor ID (0x04B4) and downloads firmware and

USB descriptors over the USB interface. The downloaded

firmware executes an electrical disconnect and connect. FX3

enumerates again, this time as a device defined by the

downloaded information. This patented two-step process, called

ReNumeration, happens instantly when the device is plugged in.

EZ-Dtect

FX3 supports USB Charger and accessory detection (EZ-Dtect).

The charger detection mechanism complies with the Battery

Charging Specification Revision 1.1. In addition to supporting

this version of the specification, FX3 also provides hardware

support to detect the resistance values on the ID pin.

FX3 can detect the following resistance ranges:

■ Less than 10 

■ Less than 1 k

■ 65 k to 72 k

■ 35 kto 39 k

■ 99.96 k to 104.4 k (102 k2%)

■ 119 k to 132 k

■ Higher than 220 k

■ 431.2 k to 448.8 k (440 k2%)

FX3's charger detects a dedicated wall charger, Host/Hub

charger, and Host/Hub.

VBUS Overvoltage Protection

The maximum input voltage on FX3's VBUS pin is 6 V. A charger

can supply up to 9 V on VBUS. In this case, an external

overvoltage protection (OVP) device is required to protect FX3

from damage on VBUS. Figure 4 shows the system application

diagram with an OVP device connected on VBUS. Refer to

Table 7 for the operating range of VBUS and VBATT.

Figure 4. System Diagram with OVP Device For VBUS

Carkit UART Mode

The USB interface supports the Carkit UART mode (UART over

D+/D–) for non-USB serial data transfer. This mode is based on

the CEA-936A specification.

In the Carkit UART mode, the output signaling voltage is 3.3 V.

When configured for the Carkit UART mode, TXD of UART

(output) is mapped to the D– line, and RXD of UART (input) is

mapped to the D+ line.

In the Carkit UART mode, FX3 disables the USB transceiver and

D+ and D– pins serve as pass-through pins to connect to the

UART of the host processor. The Carkit UART signals may be

routed to the GPIF II interface or to GPIO[48] and GPIO[49], as

shown in Figure 5 on page 7.

In this mode, FX3 supports a rate of up to 9600 bps.

POWER SUBSYSTEM

EZ-USB FX3

VBUS

GND

SSRX-

SSRX+

SSTX-

SSTX+

D-

D+

OTG_ID

OVP device

FX3 Datasheet(PDF) 6 Page - Cypress Semiconductor

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