PRELIMINARY
WirelessUSBTM EX Baseband IC
CYWUSB6942
Cypress Semiconductor Corporation
3901 North First Street
San Jose
,
CA 95134
408-943-2600
Document #: 38-16005 Rev. **A
Revised May 2, 2003
1.0
Features
Low cost, low power, 2.4-GHz WirelessUSB
EX
baseband IC
Frequency-hopping, spread-spectrum (FHSS)
Coexists with other 2.4-GHz systems
Low latency, high throughput
Bidirectional communication
Forward Error Correction (FEC) and automatic packet
retry
Low battery power detection
Supports up to seven
peripherals (multi-drop)
Direct support of optical mouse
Direct support of 18 x 8 keyboard scan matrix
Direct support of Cypress enCoRe
IC for USB bridge
applications
Wide operating voltage (2.7 to 3.6V)
Commercial temperature range (0
C to +70
C)
Low power/sleep mode (I
SB
< 1.0
A typical)
Small package 100-pin TQFP (14 x 14 x1.6 mm)
2.0
Applications
The CYWUSB6942 is targeted for a variety of wireless HID
applications, including
Mice
Keyboards
USB bridges
Game controllers
C YWU SB6941
4
2 .4 GHz Radio
4
EEP ROM
13
6
13
7
8
S P I
Fra m e r
P rotocol /
Applica tion
Engine
32-Byte
FIFO
S yste m
RAM
(8KB)
Boot
Loa de r
GP IO
GP O
GP I
W ire les s USB EX
Bas e ba nd
C YW U S B 6942
Figure 2-1. CYWUSB6942 Top-level Block Diagram
PRELIMINARY
CYWUSB6942
Document #: 38-16005 Rev. **A
Page 2 of 21
TABLE OF CONTENTS
1.0 FEATURES ...................................................................................................................................... 1
2.0 APPLICATIONS ............................................................................................................................... 1
3.0 GENERAL DESCRIPTION ............................................................................................................... 4
3.1 Functional Overview ................................................................................................................... 4
3.1.1 Efficient and Reliable Datagram Delivery .......................................................................................... 4
3.1.2 Direct Support for Wireless Peripherals ............................................................................................ 4
3.1.3 Input/Output Interfaces ...................................................................................................................... 5
3.1.4 Power Management .......................................................................................................................... 5
3.1.5 Wide Operating Range ...................................................................................................................... 5
4.0 ARCHITECTURE OVERVIEW ......................................................................................................... 6
4.1 Framer. ....................................................................................................................................... 6
4.2 GPIO/GPO/GPI Blocks. .............................................................................................................. 6
4.3 SPI Block .................................................................................................................................... 6
4.4 System RAM ............................................................................................................................... 6
4.5 Protocol/Application Engine ........................................................................................................ 6
5.0 INTERFACE ..................................................................................................................................... 7
5.1 The Radio Control Interface ........................................................................................................ 7
5.2 The SPI Interface ........................................................................................................................ 8
5.2.1 Overview ........................................................................................................................................... 8
5.2.2 SPI Signaling ..................................................................................................................................... 8
5.3 Serial EPROM Interface .............................................................................................................. 9
5.3.1 Functional Description ....................................................................................................................... 9
5.3.2 Serial EPROM Interface Signaling .................................................................................................... 9
5.4 Interface for Wakeup and Sleep ............................................................................................... 10
6.0 CYWUSB6942 PIN DESCRIPTION .............................................................................................. 11
7.0 ABSOLUTE MAXIMUM RATINGS ................................................................................................ 15
8.0 OPERATING CONDITIONS ........................................................................................................... 15
9.0 DC CHARACTERISTICS ............................................................................................................... 15
9.0 DC CHARACTERISTICS
(Over the Operating Range)
.......................................................................... 15
10.0 SWITCHING CHARACTERISTICS
............................................................................................. 16
11.0 SWITCHING WAVEFORMS ....................................................................................................... 17
12.0 AC TEST LOADS AND WAVEFORMS FOR DIGITAL PINS ...................................................... 19
13.0 ORDERING INFORMATION ........................................................................................................ 19
14.0 PACKAGE DIAGRAMS ............................................................................................................... 20
PRELIMINARY
CYWUSB6942
Document #: 38-16005 Rev. **A
Page 3 of 21
LIST OF FIGURES
Figure 2-1. CYWUSB6942 Top-level Block Diagram .............................................................................. 1
Figure 3-1. CYWUSB6942 Device Family Usage Scenario .................................................................... 4
Figure 4-1. CYWUSB6942 Framer Block Diagram.................................................................................. 6
Figure 5-1. CYWUSB6942 Radio Control Interface Diagram .................................................................. 7
Figure 5-2. SPI Timing............................................................................................................................. 8
Figure 5-3. CYWUSB6942 Serial EPROM Interface Diagram................................................................. 9
Figure 5-4. Serial EPROM Interface Timing ............................................................................................ 9
Figure 6-1. CYWUSB6942 100-pin TQFP Top View ............................................................................. 14
Figure 11-1. SPI Waveforms ................................................................................................................. 17
Figure 11-2. Serial EPROM Interface Waveforms ................................................................................. 17
Figure 11-3. Radio Serial Interface ........................................................................................................ 18
Figure 11-4. CYWUSB6942 Reset Timing ............................................................................................ 18
Figure 14-1. CYWUSB6942 100-pin TQFP Package Diagram ............................................................. 20
LIST OF TABLES
Table 6-1. Pin Description Table .......................................................................................................... 11
Table 10-1. CYWUSB6942 Switching Characteristics
(Over the Operating Range)
.................................... 16
PRELIMINARY
CYWUSB6942
Document #: 38-16005 Rev. **A
Page 4 of 21
3.0
General Description
3.1
Functional Overview
WirelessUSB EX enables low-cost, low-power WirelessHID
solutions using 2.4-GHz Industrial Scientific Medical (ISM) band
and frequency-hopping spread-spectrum (FHSS) technology. The CYWUSB6942 supports wireless peripheral applications such
as optical mice, keyboards, and game controllers by transferring data between the peripherals and the host over the air through
the WirelessUSB EX protocol.
The CYWUSB6942 WirelessUSB EX Baseband IC is part of a two-device chipset for implementing a WirelessUSB-based appli-
cation. The CYWUSB6941 WirelessUSB Radio IC is also needed to complete the WirelessUSB EX chipset.
When used with a Cypress enCoRe
chip, the WirelessUSB EX chipset also acts as a USB bridge to allow wireless peripherals
using the CYWUSB6942 devices to communicate with the host via a low-speed USB link. Data received by the WirelessUSB EX
chipset from a peripheral device is transferred to the enCoRe chip and then sent upstream to the USB host device. Downstream
data is transferred from the enCoRe to the WirelessUSB EX chipset and then sent to the peripheral over the air. Each
WirelessUSB EX chipset acting as a USB bridge can support up to seven peripherals.
For more information on the WirelessUSB EX system, protocol and internal operations, see our application note entitled
WirelessUSB EX Theory of Operation.
3.1.1
Efficient and Reliable Datagram Delivery
The WirelessUSB EX chipset implements a highly-efficient, bidirectional wireless protocol designed to reliably and quickly send
and receive data packets between devices with a high throughput of 1 Mbps raw data rate. The WirelessUSB EX Baseband
device contains a framer, which handles all bit-level operations, maximizing available processing bandwidth in the Protocol and
Application Engines for embedded applications. It also ensures reliable and secure datagram delivery by applying algorithms
such as CRC, encryption, data whitening, and Forward Error Correction (FEC).
HID datagrams are delivered over the air using a low power 2.4-GHz FHSS radio that can coexist with other 2.4 GHz systems
(e.g., Bluetooth
, IEEE 802.11b, analog cordless phones).
3.1.2
Direct Support for Wireless Peripherals
The CYWUSB6942 device provides direct support for an optical mouse, an 18 8 keyboard scan matrix, and a USB host bridge
applications when used with the Cypress enCoRe chip. As a result, low cost solutions can be implemented with a minimal number
of external components required.
Figure 3-1. CYWUSB6942 Device Family Usage Scenario
WirelessUSB EX keyboard
using the CYWUSB6941 &
CYWUSB6942
WirelessUSB EX optical mouse
using the CYWUSB6941 &
CYWUSB6942
WirelessUSB EX host
using the CYWUSB6941 &
CYWUSB6942
Host
USB
PRELIMINARY
CYWUSB6942
Document #: 38-16005 Rev. **A
Page 5 of 21
3.1.3
Input/Output Interfaces
The CYWUSB6942 offers up to six general purpose input/output (GPIO) pins, twenty-one GPO pins, seven GPI pins, and a Serial
Peripheral Interface (SPI), allowing the implementation of a wide variety of wireless HID applications including mice, keyboards,
game controllers, and USB bridges.
3.1.4
Power Management
The CYWUSB6942 provides power management, including a low battery power detection and low-power mode.
3.1.4.1
Low Battery Power Detection
A DC-DC converter can be used to provide the required operating voltage to the system as well as a low battery warning signal
via the PFO pin. When the voltage levels provided by the batteries are below a preset threshold, the PFO signal should be
asserted, allowing the CYWUSB6942 to take appropriate action.
3.1.4.2
Low-Power Standby/Sleep Mode
The CYWUSB6942 provides support for a very low power mode (ISB < 1.0
A typical). For details, please refer to Section 5.4.
3.1.5
Wide Operating Range
The CYWUSB6942 device is offered with wide operating voltage (2.7 to 3.6V), commercial temperature range (0C to +70C),
and small package (14 x 14 mm TQFP), providing the flexibility for the implementation of a wide variety of wireless HID applica-
tions.
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