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p1 of 9
26-Aug-10
USB-SPI
HW144-7
www.hexwax.com
USB-SPITM
Driver-free USB to synchronous serial SPI slave interface
Summary
USB-SPI is a single chip USB to synchronous serial SPI
slave interface. It greatly simplifies the connection of
personal computer to a microcontroller capable of
communicating in SPI master mode. In addition to the
standard 4 SPI control lines, 11 additional Virtual I/O
lines have custom-defined functionality.
USB-SPI uses the Human Interface Device (HID) USB
profile. It does not require USB driver installation, and
so is compatible with present and future Windows, Linux
and Mac operating systems.
USB-SPI is firmware for the PIC18LF2455 and
PIC18F14K50 microcontrollers. It requires only a few
discrete components and is available 28-pin DIL and 20-
pin SSOP packages.
For SPI master applications (to control SPI slave
devices), our expandIO-USB product is more suitable.
Features
Suitable for connection to SPI master devices
Single chip solution
True HID plug and play - No drivers required
USB 2.0 compatible
Achievable data transfer rates up to 600K baud
Max SPI clock rate 1MHz
32-bit serial number
128-byte FIFO receive buffer
128-byte FIFO transmit buffer
Operating voltage 1.8V – 5V
11 auxiliary I/O pins, configurable as digital I/O,
10-bit A-to-D, USB status
VID, PID, product descriptor and I/O configuration
may be specified at program time or at runtime
PIC18F14K50-based DIL, SSOP packages
PIC18LF2455-based DIL, SIOC packages
Mechanical
Specifications
Applications
USB SPI slave for connection to SPI host devices
USB data transfer for consumer products
USB industrial control
Firmware Factory USB Product Family
USB-232 asynchronous serial interface
TEAleaf-USB security and authentication dongle
expandIO-USB I/O expander
USB-SPI synchronous serial interface
USB-I2C synchronous serial interface
USB-TakeOff managed power take-off, wakeup
and charge controller
USB-DAQ data logger
USB-FileSys USB embedded file system
Table 1. Electrical Specifications
Operating voltage (20 pin / 28 pin)
1.8V/2.7V–5.5V
Typical/max supply current, Vdd = 5.0
10mA / 21mA
Operating Temperature
-40°C to +85°C
Refer to base microcontroller data sheet for further information
Firmware Factory Ltd
2 Marshall St, 3
rd Floor
London W1F 9BB, UK
sales@firmwarefactory.com
support@firmwarefactory.com
USB
Status
Outputs
128-byte Rx buffer
USB
Engine
128-byte Tx buffer
SPI
Engine
Control
Inputs
128-byte Tx buffer
Auxiliary I/O
Serial
Data