Data Book AU9720 USB to Serial Bridge Controller Technical Reference Manual Product Specification Official Release Revision 1.05W Public Apr 2005 Data Sheet Status This data sheet contains target or goal specifications for Objective specification product development. This Preliminary specification data sheet contains preliminary data; supplementary data may be published later. Product specification This data sheet contains final product specifications. Revision History Date Revision Apr. 2005 1.05W Description Removed the schematics. Please contact our sales if you need it. Page 2 of 16 AU9720 USB to Serial Bridge Controller V1.05W Official release_ Public Copyright Notice Copyright 1997 - 2005 Alcor Micro Corp. All Rights Reserved. Trademark Acknowledgements The company and product names mentioned in this document may be the trademarks or registered trademarks of their manufacturers. Disclaimer Alcor Micro Corp. reserves the right to change this product without prior notice. Alcor Micro Corp. makes no warranty for the use of its products and bears no responsibility for any error that appear in this document. Specifications are subject to change without prior notice. Contact Information: Web site: http://www.alcormicro.com/ Taiwan Alcor Micro Corp. 4F, No 200 Kang Chien Rd., Nei Hu, Taipei, Taiwan, R.O.C. Phone: 886-2-8751-1984 Fax: 886-2-2659-7723 Santa Clara Office Los Angeles Office 2901 Tasman Drive, Suite 206 9070 Rancho Park Court Santa Clara, CA 95054 Rancho Cucamonga, CA.91730 USA USA Phone: (408) 845-9300 Phone: (909) 483-9900 Fax: (408) 845-9086 Fax: (909) 944-0464 Page 3 of 16 AU9720 USB to Serial Bridge Controller V1.05W Official release_ Public Table of Contents 1 Introduction…………………………………………………………….. 6 1.1 Description…………………………………………………………………………….. 6 1.2 Features…………………………………………………………………………………. 6 2 Application Block Diagram…………………………………………. 7 3 Pin Assignment………………………………………………………… 8 4 System Architecture and Reference Design………………….. 10 4.1 AU9720 Block Diagram…………………………………………………………. 10 5 Electrical Characteristics…………………………………………… 11 5.1 Recommended Operating Conditions………………………………….. 11 5.2 General DC Characteristics…………………………………………………… 11 5.3 DC Electrical Characteristics for 3.3 volts operation…………… 11 5.4 Crystal Oscillator Circuit Setup for Characterization…………… 12 5.5 ESD Test Results……………………………………………………………………. 12 5.6 Latch-Up Test Results……………………………………………………………. 13 6 Mechanical Information……………………………………………… 15 Page 4 of 16 AU9720 USB to Serial Bridge Controller V1.05W Official release_ Public List of Figures 2.1 Block Diagram………………………………………………………………………………….. 7 3.1 Pin Assignment Diagram………………………………………………………………….. 8 4.1 AU9720 Block Diagram……………………………………………………………………… 10 5.1 Crystal Oscillator Circuit Setup for Characterization Diagram……….. 11 5.2 Latch-Up Test Results Diagram…………………………………………………… 13 6.1 Mechanical Information Diagram…………………………………………………….. 15 List of Tables 3.1 Pin Descriptions……………………………………………………………………………. 9 5.1 Recommended Operating Conditions………………………………………….. 11 5.2 General DC Characteristics………………………………………………………….. 11 5.3 DC Electrical Characteristics for 3.3 volts operation……………………… 11 5.4 ESD Data………………………………………………………………………………… 12 5.5 Latch-Up Data Table……………………………………………………………………… 13 Page 5 of 16 AU9720 USB to Serial Bridge Controller V1.05W Official release_ Public 1.0. Introduction 1.1. Description The AU9720 operates as a bridge between one USB port and one standard RS232 Serial port. The two large on-chip buffers have been pre-configured to accommodate the data flow between two different buses. The USB bulk-type data is adopted for maximum data transfer, which could be up to 6M bits/sec. Automatic handshake is supported at the Serial port. With these, a much higher baud rate can be achieved compared to the system uses legacy UART controller. This device is also compliant with USB power management and remote wakeup scheme. Only minimum required power is consumed from the host during Suspend. By integrating all the function in a 28-SSOP package, this chip is suitable to be embedded inside a data cable. With such cables, users can connect between a PC host and any device with RS232 interface. 1.2. Features Support USB Specification v1.1 and USB CDC v1.1 Support the RS232 Serial interface Support automatic handshake mode Support automatic hardware flow control with CTS/RTS Support automatic software flow control with XON/XOFF Support Remote wake-up and power management 384/128 bytes buffer each for upstream and downstream data flow Support default ROM or external EEPROM for device configuration On chip USB transceiver Crystal oscillator running at 12MHz Support Windows 98/SE, ME, 2000, XP, Windows CE3.0, CE.NET, Linux, and Mac OS 28 Pins SSOP Lead-Free package Page 6 of 16 AU9720 USB to Serial Bridge Controller V1.05W Official release_ Public 2.0. Application Diagram The following diagram shows several typical applications using AU9720. By connecting the USB connector to a desktop or notebook PC through AU9720, which is implemented as a bus-powered, a programmable speed could be gained to transfer data between PC and mobile phones with much higher baud rate speed than what normal UART devices could offer. Moble Phones Moble Phones Printer Fax USB TO RS232 USB TO RS232 Video PDA Computer Computer Page 7 of 16 AU9720 USB to Serial Bridge Controller V1.05W Official release_ Public 3.0. Pin Assignment The AU9720 is packaged in 28pin SSOP Lead-Free. The following figure shows signal name for each pin and the table in the following page describes each pin in details. Figure 3.1 Pin Assignment Diagram TXD 1 28 GND_PLL DTRB 2 27 VDD_PLL RTSB 3 26 OSC2 VDD_232 4 25 OSC1 RXD 5 24 VCC2.5V RIB 6 23 VCC5V DSRB 7 22 VCC3V DCDB 8 21 DP CTSB 9 20 DM RESETB 10 19 GND (I/O) GP0 11 18 TESTB GP1 12 17 VDD GP2 13 16 GND EE_DAT 14 15 EE_CLK Alcor Micro AU9720 28-PIN SSOP Page 8 of 16 AU9720 USB to Serial Bridge Controller V1.05W Official release_ Public Table 3.1 Pin Assignments Pin# Pin Name I/O Description 1 TXD O Data Output to serial port 2 DTRB O Low: Data Terminal Ready (serial port) 3 RTSB O Low: Request To Send; (serial port) 4 VDD_232 5 RXD I Data Input from serial port 6 RIB I Low: Ring Indicator (Serial Port) 7 DSRB I Low: Data Set Ready (Serial port) 8 DCDB I Low: Data Carrier Detect (serial port) 9 CTSB I Low: Clear to send (serial port) 10 RESETB I System reset 11 GP0 PWR I/O VDD for RS-232 (Input) Reserved for System Output use High (connect with external 47K resistor) for 12 GP1 I/O USB Heavy Load (500mA); Low (connect with external 220K resistor) for USB Light Load (100mA) 13 GP2 I/O Shutdown Transceiver under Suspend mode 14 EE_DAT I/O External EEPROM data signal 15 EE_CLK I/O External EEPROM clock 16 GND PWR Ground 17 VDD PWR Power input (3.3V) 18 TESTB 19 GND (I/O) 20 DM I/O USB DMINUS signal 21 DP I/O USB DPLUS Signal 22 VCC3V PWR 3.3v power output 23 VCC5V PWR 5v power input 24 VCC2.5V PWR 2.5v power output 25 OSC1 I Crystal oscillator input 26 OSC2 O Crystal oscillator output 27 VDD_PLL PWR 3.3V input power for PLL 28 GND_PLL PWR Ground for PLL I PWR Reserved I/O Ground Page 9 of 16 AU9720 USB to Serial Bridge Controller V1.05W Official release_ Public 4.0. System Architecture and Reference Design 4.1. Block Diagram Figure 4.1 AU9720 USB to Serial Bridge controller Block Diagram USB PORT PLL I2C BUS 8052 CPU EEPROM INTERFACE Memory Input Buffer Serial PORT UART Interface USB Transceiver Output Buffer USB to RS232 Bridge Core USBEngine Endpoint Endpoint0 Control frametimer Endpoint1 Control MemoryControl UsbProtocol ControlTr ansState Crc InOutCon trol PacketSta te SERDES UpPortSta tus UsbPll USBCpuInterface Ripple Counter CpuInterface USBXferControl Page 10 of 16 AU9720 USB to Serial Bridge Controller V1.05W Official release_ Public 5.0. Electrical Characteristics 5.1 Recommended Operating Conditions Table 5.1 Recommended Operating Conditions SYMBOL PARAMETER MIN TYP MAX UNITS VCC Power Supply 4.75 5 5.25 V VIN Input Voltage 0 VCC V TOPR Operating Temperature 0 85 O TSTG Storage Temperature -40 125 O TYP MAX UNITS C C 5.2 General DC Characteristics Table 5.2 General DC Characteristics SYMBOL PARAMETER CONDITIONS MIN IIL Input low current no pull-up or pull-down -1 1 µA IIH Input high current no pull-up or pull-down -1 1 µA IOZ Tri-state leakage current -10 10 µA CIN Input capacitance 5 ρF COUT Output capacitance 5 ρF CBID Bi-directional buffer capacitance 5 ρF 5.3 DC Electrical Characteristics for 3.3 volts operation Table 5.3 DC Electrical Characteristics for 3.3 volts operation SYMBO PARAMETER CONDITIONS VIL Input Low Voltage CMOS VIH Input Hight Voltage CMOS VOL Output low voltage IOL=4mA, 16mA VOH Output high voltage IOH=4mA,16mA RI Input Pull-up/down resistance Vil=0V or Vih=VCC MIN TYP MAX UNITS 0.9 V 2.3 V 0.4 2.4 V V 10K/200K KΩ Page 11 of 16 AU9720 USB to Serial Bridge Controller V1.05W Official release_ Public 5.4 Crystal Oscillator Circuit Setup for Characterization The following setup was used to measure the open loop voltage gain for crystal oscillator circuits. The feedback resistor serves to bias the circuit at its quiescent operating point and the AC coupling capacitor, Cs, is much larger than C1 and C2. Figure 5.1 Crystal Oscillator Circuit Setup for Characterization 5.5 ESD Test Results Test Description: ESD Testing was performed on a Zapmaster system using the Human-Body-Model (HBM) and Machine-Model (MM), according to MIL-STD 883 and EIAJ IC-121 respectively. Human-Body-Model stresses devices by sudden application of a high voltage supplied by a 100pF capacitor through 1.5k-ohm resistance. Machine-Model stresses devices by sudden application of a high voltage supplied by a 200pF capacitor through very low (0 ohm) resistance. Test circuit & condition Zap Interval: 1 second Number of Zaps: 3 positive and 3 negative at room temperature Criteria: I-V Curve Tracing Table 5.4 ESD Data Model Mode S/S Target Results HBM Vdd, Vss, I/C 15 6000V PASS MM Vdd, Vss, I/C 15 200V PASS Page 12 of 16 AU9720 USB to Serial Bridge Controller V1.05W Official release_ Public 5.6 Latch-Up Test Results Test Description: Latch-Up testing was performed at room ambience using an IMCS-4600 system which applies a stepped voltage to one pin per device with all other pins open except Vdd and Vss, to which 5Volts and ground were biased respectively. Testing was started at 5.0V (Positive) or 0V (Negative), and the DUT was biased for 0.5 seconds. If neither the PUT current supply nor the device current supply reached the predefined limit (DUT=00mA, Icc=100mA), then the voltage was increased by 0.1Volts and the pin was tested again. This procedure was recommended by the JEDEC JC-40.2 CMOS Logic standardization committee. Notes: 1. DUT: The device under test. 2. PUT: The pin under test. Figure 5.2 Latch-Up Test Results Test Circuit: Positive Input/Output Overvoltage/Overcurrent Page 13 of 16 AU9720 USB to Serial Bridge Controller V1.05W Official release_ Public Test Circuit: Negative Input/Output Overvoltage/Overcurrent Supply Overvoltage Test Table 5.5 Latch–Up Data Mode + + Current Vdd - Vxx Voltage Voltage (V)/Current (mA) S/S Results 11.0 11.0 200 200 9.0 5 5 5 5 5 Pass Pass Pass Pass Pass Page 14 of 16 AU9720 USB to Serial Bridge Controller V1.05W Official release_ Public 6.0 Mechanical Information Figure 6.1 Mechanical Information Diagram Pin 28 Top View Pin 1 Side View End View Page 15 of 16 AU9720 USB to Serial Bridge Controller V1.05W Official release_ Public 【MEMO】 About Alcor Micro, Corp Alcor Micro, Corp. designs, develops and markets highly integrated and advanced peripheral semiconductor, and software driver solutions for the personal computer and consumer electronics markets worldwide. We specialize in USB solutions and focus on emerging technology such as USB and IEEE 1394. The company offers a range of semiconductors including controllers for USB hub, integrated keyboard/USB hub and USB Flash memory card reader…etc. Alcor Micro, Corp. is based in Taipei, Taiwan, with sales offices in Taipei, Japan, Korea and California. Alcor Micro is distinguished by its ability to provide innovative solutions for spec-driven products. Innovations like single chip solutions for traditional multiple chip products and on-board voltage regulators enable the company to provide cost-efficiency solutions for the computer peripheral device OEM customers worldwide. Page 16 of 16 AU9720 USB to Serial Bridge Controller V1.05W Official release_ Public