MCS7784 USB to IrDa Port Features Applications • Low-power 3.3V CMOS design • On board 5V to 3.3V voltage regulator • Single 12 MHz crystal • IrDA data rates from 2.4 Kbps to 115.2 kbps in SIR mode • USB specification 1.1 compliant. • Re-configurable Vendor specific parameters (Vendor ID, Product ID, Release #) • Support for 4 string descriptors (Language ID, Manufacture ID, Product Name, Serial Number) • Supports all USB standard commands. • I2C interface for EEPROM • Low-profile 28-Pin SSOP package • Cell Phones • Embedded applications • Add-on IrDA dingle General Description The MCS7784 controller provides bridging between the Universal Serial Bus (USB) input and IrDA port. This device contains all the necessary logic to communicate with the host computer via the USB bus. Supports data rate of 2.4Kbps to 115.2Kbps. Ordering Information In addition, the MCS7784 contains a 3.3V regulator and operates in bus-powered mode. The MCS7784 uses single 12 MHz crystal oscillator. Page 2-20 Application Note • AN7784 Evaluation Board • MCS7784-EVB Commercial Grade ( 0° C to +70° C ) MCS7784CS MCS7784CS-GR 28-SSOP 28-SSOP Standard RoHS MCS7784 USB to IrDa Port MCS7784 Pin assignment TX 1 28 XTAL2 N.C. 2 27 XTAL1 3 26 TST 4 25 AGND RX 5 24 3.3VA N.C. 6 GND 7 3.3V 8 N.C. 9 N.C. 10 MCS7784CS N.C. RSTO 23 N.C. 22 N.C. 21 GND 20 5V 19 RESET N.C. 11 18 GND TCLK 12 17 VOUT EECLK 13 16 DM EESDA 14 15 DP Page 2-21