USB OTG and Embedded Host Microchip Technology Incorporated. All Rights Reserved. Slide 1

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Moses Sparks
7 years ago
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2 Topics Nomenclature USB Universe USB OTG versus Embedded Host USB Embedded Host USB On-The-Go USB OTG Device Must have features OTG Architecture Application Examples Microchip USB OTG Features Microchip USB OTG Product Portfolio Meeting the needs of Product Makers Summary 2008 Microchip Technology Incorporated. All Rights Reserved. Slide 2

Microchip USB OTG Features Microchip USB OTG Product Portfolio Meeting the needs of

3 Nomenclature Embedded Host also Mini Host, a Type A host class product with fixed capabilities to save cost and complexity Peripheral Device, a Type B class product that requires a host or embedded host or OTG OTG A Type AB product, a combination of Embedded host and Peripheral 2008 Microchip Technology Incorporated. All Rights Reserved. Slide 3

that requires a host or embedded host or OTG OTG A Type AB product, a combination of

5 On-The-Go Versus Embedded Host OTG Embedded Host Limited host capabilities Limited host capabilities Possess dual role - host or peripheral Posses single role host capability to switch between the two Devices have only Mini-A receptacle Devices have Mini-AB receptacle Does not require Host Negotiation OTG devices must have Host Protocol (HNP) and optionally Negotiation Protocol (HNP) and support Session Request Protocol Session Request Protocol (SRP) (SRP) Do not operate either as hub or full host as normal host does 2008 Microchip Technology Incorporated. All Rights Reserved. Slide 5

Negotiation OTG devices must have Host Protocol (HNP) and optionally Negotiation Protocol (HNP) and support Session Request Protocol Session

6 Embedded Host Limited resources Target Peripheral List Must be capable of supplying at least 8mA on VBUS High-, Full-, Low-speed may be supported Of the 4 USB transfer modes Mandatory to support Control and could support Bulk, Interrupt and Isochronous based on target peripheral list Example Set Top box 2008 Microchip Technology Incorporated. All Rights Reserved. Slide 6

support Control and could support Bulk, Interrupt and Isochronous based on target peripheral

7 USB On-The-Go Meeting the requirements of connectivity in standardized method for small form factor devices Supplement to USB 2.0 specification Gives dual role (Host and Peripheral) capability to the devices and to switch between the two Low power requirements to facilitate USB on small foot print devices 2008 Microchip Technology Incorporated. All Rights Reserved. Slide 7

0 specification Gives dual role (Host and Peripheral) capability to the devices and to switch

8 OTG Must have features A limited Host capability Full-speed operation as a peripheral (high-speed optional) Full-speed support as a host (low-speed and high-speed optional) Targeted Peripheral List (Device classes) Session Request Protocol Host Negotiation Protocol One, and only one connection: a Micro-AB receptacle Bus current of minimum 8mA Means for communicating messages to the user 2008 Microchip Technology Incorporated. All Rights Reserved. Slide 8

Request Protocol Host Negotiation Protocol One, and only one connection: a Micro-AB receptacle Bus current of

9 USB Device Classes Floppy Drive Mouse Data Glove Thumb Drive Ethernet Adapter PICkit 2 Starter Kit Joystick External Hard Drive Mass Storage Device Class (MSD) Modem Keyboard Communication Device Class (CDC) ICD2 Human Interface Device Class (HID) Custom Class (Vendor Class) Many more USB classes Microchip Technology Incorporated. All Rights Reserved. Slide 9

Communication Device Class (CDC) ICD2 Human Interface Device Class (HID) Custom Class

10 Session Request Protocol (SRP) Peripheral requests host to start a session Host OTG Controls Device Host activates power bus for peripheral, session commences Host OTG Controls Device Power Bus When session ends, bus is turned off, conserving power Host OTG Controls Device 2008 Microchip Technology Incorporated. All Rights Reserved. Slide 10

Controls Device Power Bus When session ends, bus is turned off, conserving power Host

11 Host Negotiation Protocol (HNP) Peripheral Starts as Host, Interrogates peripheral Host OTG Controls Device If peripheral is device, then it remains host Host OTG Controls Device If peripheral is host, then it becomes device Device OTG Controls Host 2008 Microchip Technology Incorporated. All Rights Reserved. Slide 11

host Host OTG Controls Device If peripheral is host, then it becomes device

12 Mini-AB Connectors An OTG device contains a single Mini-AB receptacle that functions as either a host or a peripheral e.g. PDA An OTG device acts as host when Mini-A plug is inserted Mini-AB Receptacle An OTG device acts as device when Mini-B plug is inserted Only Mini-B receptacle is used for devices that operate as peripheral only e.g. cameras Only Mini-A receptacle is used for devices that operate as embedded host only e.g. set top box Mini-B Receptacle Mini-A Receptacle 2008 Microchip Technology Incorporated. All Rights Reserved. Slide 12

PDA An OTG device acts as host when Mini-A plug is inserted Mini-AB Receptacle An OTG device acts as device when Mini-B plug is inserted

13 OTG Architecture Host HID MSC CDC Generic USB Protocol Driver Host Controller Device (HCD) Peripheral USB Protocol Layer Peripheral Controller Device (PCD) Transceiver Driver Host Controller Regs. Peripheral Controller Regs. OTG Dual Role Device Regs. On-The-Go Transceiver Regs Microchip Technology Incorporated. All Rights Reserved. Slide 13

Driver Host Controller Regs. Peripheral Controller Regs. OTG Dual Role Device Regs.

14 Application Examples Host Peripheral Application Mobile Phone Still Image Camera Printer MP3 Player Mobile Phone Still Image Camera MP3 Player Mass Storage Scanner Still Image Camera Mobile Phone Printer Mass Storage Still Image Camera Scanner Mass Storage MP3 Player Mass Storage Exchange contact information pictures, upload pictures to web Upload/download/broadcast music Uplaod/download files Scan business cards Exchange pictures pictures, upload pictures to web Print pictures Store pictures Print pictures Print scanned image Print files stored on device Exchange songs Upload/download songs 2008 Microchip Technology Incorporated. All Rights Reserved. Slide 14

pictures to web Upload/download/broadcast music Uplaod/download files Scan business cards Exchange pictures Email pictures, upload pictures to web Print pictures Store

15 PIC24FJ256GB110 Family USB OTG USB On-the-Go KB Flash 16 KB RAM CTMU ADC, 10-bit, 16 ch. Analog Comp. - 3 Watchdog 16 MIPS 16-bit Core 16-bit ALU Register File 16 x x 17 MPY Address Generation JTAG & Emu. Interface Memory Bus Barrel Shifter Interrupt Control Peripheral Bus GP I/O 16-bit Timers - 5 Input Capture - 9 Out Comp./PWM - 9 UART - 4 SPI TM -3 I 2 C TM -3 RTCC Peripheral Pin Select PMP CRC 2008 Microchip Technology Incorporated. All Rights Reserved. Slide 15

Interface Memory Bus Barrel Shifter Interrupt Control Peripheral Bus GP I/O 16-bit Timers - 5 Input Capture - 9 Out Comp.

16 PIC24FJ256GB1 General Purpose Family USB On-the-Go, 256KB Flash Features Performance MHz Program Memory Self programming Flash supports EEPROM emulation 256KB,192 KB, 128 KB, 64 KB 10,000 erase write cycles 16 KB RAM 100, 80, 64-pin TQFP Packages Internal Oscillator Low Power Modes JTAG Boundary Scan & Flash Memory Programming 3.3 V operation Low power 2.6uA at 2V Sleep power <100nA Availability Samples - NOW Production NOW USB OTG (device, mini-host, host) Internal Boost Regulator requires minimal external components Separate 3.3V regulator Transparent RAM buffer interface Peripherals 4 x UART w/lin and IrDA interfaces 3 x I 2 C 3 x SPI 16 ch. x 10-bit A/D (500 ksps) 5 x 16-bit general purpose timers 9 x IC, 9 x OC/PWM Each IC and OC/PWM includes a dedicated 16-bit scaling timer Total of individual 21 timers Peripheral Pin Select Select peripherals, map to pins 3 x comparators CTMU Charge/Time Measurement Unit Hardware RTCC and Hardware CRC Parallel Master Port 2008 Microchip Technology Incorporated. All Rights Reserved. Slide 16

6uA at 2V Sleep power <100nA Availability Samples - NOW Production NOW USB OTG (device, mini-host, host) Internal Boost Regulator requires minimal external components Separate 3.

17 Microchip meeting the needs of product makers Selection of USB products from 8 to 32bit MCU portfolio Peripheral Embedded Host OTG Feature rich products USB v2.0 On-The-Go (OTG) compliant Capacitive touch sensing for touch screens and capacitive switches Lowest power, highest memory Cost effective, BOM saving, board space saving Meeting user demand of friendliness, upgradeability and expandability Meeting multiple applications requirements with low BOM cost Support Seamless 8-/16-/32-bit toolchain Free software to get up and running 2008 Microchip Technology Incorporated. All Rights Reserved. Slide 17

0 On-The-Go (OTG) compliant Capacitive touch sensing for touch screens and capacitive switches Lowest power, highest memory Cost effective, BOM saving,

18 Summary First to have USB OTG implementation on 16bit MCU The only 16bit MCU integrated with OTG and CTMU Microchip solution caters the markets of OTG and embedded host segments Complete software support, via free USB class drivers (Host / Peripheral) for USB applications Large memory and rich peripheral set PIC s maintains pin, peripheral and software compatibility with Microchip s PIC32 USB microcontroller family 2008 Microchip Technology Incorporated. All Rights Reserved. Slide 18