Datasheet
Table Of Contents
- 1.0 Introduction
- 2.0 USB3320 Pin Locations and Definitions
- 3.0 Limiting Values
- 4.0 Electrical Characteristics
- 4.1 Operating Current
- 4.2 Clock Specifications
- 4.3 ULPI Interface Timing
- 4.4 Digital IO Pins
- 4.5 DC Characteristics: Analog I/O Pins
- 4.6 Dynamic Characteristics: Analog I/O Pins
- 4.7 OTG Electrical Characteristics
- 4.8 USB Audio Switch Characteristics
- 4.9 Regulator Output Voltages and Capacitor Requirement
- 4.10 Piezoelectric Resonator for Internal Oscillator
- 5.0 Architecture Overview
- FIGURE 5-1: USB3320 Internal Block Diagram
- 5.1 ULPI Digital Operation and Interface
- 5.2 USB 2.0 Hi-Speed Transceiver
- 5.3 Bias Generator
- 5.4 Integrated Low Jitter PLL
- 5.5 Internal Regulators and POR
- 5.6 USB On-The-Go (OTG)
- 5.7 USB UART Support
- 5.8 USB Charger Detection Support
- 5.9 USB Audio Support
- 5.10 Reference Frequency Selection
- 6.0 ULPI Operation
- 6.1 Overview
- 6.2 ULPI Register Access
- 6.3 Low Power Mode
- 6.4 Full Speed/Low Speed Serial Modes
- 6.5 Carkit Mode
- 6.6 RID Converter Operation
- 6.7 Headset Audio Mode
- 7.0 ULPI Register Map
- 8.0 Application Notes
- 8.1 Application Diagram
- TABLE 8-1: Component Values in Application Diagrams
- TABLE 8-2: Capacitance Values at VBUS of USB Connector
- FIGURE 8-1: USB3320 Application Diagram (Device, ULPI Output Clock mode, 24MHz)
- FIGURE 8-2: USB3320 Application Diagram (Device, ULPI Input Clock mode, 60MHz)
- FIGURE 8-3: USB3320 Application Diagram (Host or OTG, ULPI Output Clock Mode, 24MHz)
- 8.2 Reference Designs
- 8.3 ESD Performance
- 8.1 Application Diagram
- 9.0 Package Information
- Appendix A: Data Sheet Revision History
- The Microchip Web Site
- Customer Change Notification Service
- Customer Support
- Product Identification System
- Worldwide Sales and Service
2014-2016 Microchip Technology Inc. DS00001792E-page 27
USB3320
5.6.1.2 Measuring ID Resistance to Ground
The Link can used the integrated resistance measurement capabilities to determine the value of an ID resistance to
ground. Ta ble 5- 4 lists the valid values of resistance, to ground, that the USB3320 can detect.
The Rid resistance can be read while the USB3320 is in Synchronous Mode. When a resistor to ground is attached to
the ID pin, the state of the IdGnd comparator will change. After the Link has detected ID transition to ground, it can use
the methods described in Section 6.6 to operate the Rid converter.
5.6.1.3 Using IdFloat Comparator
The ID pin can be either grounded, floated, or connected to ground with a 102kΩ external resistor. To detect the 102K
resistor, set the idPullup bit in the OTG Control register, causing the USB3320 to apply the 100K internal pull-up con-
nected between the ID pin and VDD33. Set the idFloatRise and idFloatFall bits in both the USB Interrupt Enable Rising
and USB Interrupt Enable Falling registers to enable the IdFloat comparator to generate an RXCMD to the Link when
the state of the IdFloat changes. As described in Figure 6-3, the alt_int bit of the RXCMD will be set. The values of IdGnd
and IdFloat are shown for the three types cables that can attach to the USB Connector in Tab le 5 -5.
To save current when an A Plug is inserted, the internal 102kΩ pull-up resistor can be disabled by clearing the IdPullUp
bit in the OTG Control register and the IdFloatRise and IdFloatFall bits in both the USB Interrupt Enable Rising and USB
Interrupt Enable Falling registers. If the cable is removed the weak R
IDW
will pull the ID pin high.
The IdGnd value can be read using the ULPI USB Interrupt Status register, bit 4. In host mode, it can be set to generate
an interrupt when IdGnd changes by setting the appropriate bits in the USB Interrupt Enable Rising and USB Interrupt
Enable Falling registers. The IdFloat value can be read by reading the ULPI Carkit Interrupt Status register bit 0.
TABLE 5-4: VALID VALUES OF ID RESISTANCE TO GROUND
ID Resistance to Ground RID Value
Ground 000
75Ω +/-1% 001
102kΩ +/-1% 010
200kΩ+/-1% 011
440kΩ +/-1% 100
Floating 101
Note: IdPullUp = 0
Note: The ULPI specification details a method to detect a 102kΩ resistance to ground using the IdFloat compar-
ator. This method can only detect 0ohms, 102kΩ, and floating terminations of the ID pin. Due to this limita-
tion it is recommended to use the RID Converter as described in Section 5.6.1.2.
TABLE 5-5: IDGND AND IDFLOAT VS. ID RESISTANCE TO GROUND
ID Resistance IDGND IDFLOAT
Float 1 1
102K 1 0
GND 0 0
Note: The ULPI register bits IdPullUp, IdFloatRise, and IdFloatFall should be enabled.
Note: The IdGnd switch has been provided to ground the ID pin for future applications.