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UR6HCPS2-SP40 Schematic ( PDF Datasheet ) - Semtech Corporation

Teilenummer UR6HCPS2-SP40
Beschreibung Converts PS/2 Data to Serial or SPI
Hersteller Semtech Corporation
Logo Semtech Corporation Logo 




Gesamt 22 Seiten
UR6HCPS2-SP40 Datasheet, Funktion
PS2AdaptTM UR6HCPS2-SP40
Converts PS/2 Data to Serial or SPI
HID & SYSTEM MANAGEMENT PRODUCTS, PROTOCOL INTERPRETER FAMILY
DESCRIPTION
The PS2AdaptTM is a Zero-PowerTM
protocol interpreter that can link an
AT/PS/2-compatible Human Input
Device (HID), such as a keyboard,
mouse, bar-code reader, etc. to any
host system equipped with either
Asynchronous Serial Interface (ASI)
or the Serial Peripheral Interface
(SPI).
The IC was designed specifically
for RISC-based portable devices
that are limited to ASI and SPI
interfaces. The PS2AdaptTM allows
designers to easily connect PS/2
devices to their system.
The UR6HCPS2-SP40 emulates all
the functions of the 8042 keyboard
controller which typically resides on
the AT/PS/2 motherboard. The
Zero-PowerTM PS2AdaptTM will power
down even between
key presses and bewteen mouse
reports. Typical power
consumption is only 1 µA operating
between 3-5 Volts.
The UR6HCPS2-SP40 boasts 4
external PS/2 ports that support the
hot-plug connection of an external
PS/2 keyboard or mouse,
including MouseWheel, 5-button
mice and touch screens in absolute
mode.
FEATURES
• Typically consumes less than 1 µA
• Interfaces the host system via
either Asynchronous Serial
Interface or Serial Peripheral
Interface (SPI)
• Jumper selectable interface and
Baud rate
• Offers four PS/2 ports for the hot-
plug connection of external
keyboards or mice including
MouseWheel, 5 button mice and
absolute mode touch screens
• Easy to use, one way
communication protocol
• Operating voltage between 3
and 5 Volts
• Custom versions available in
small or large quantities
• Small 7x7 mm package to
accommodate slim designs
APPLICATIONS
• H/PCs
• Web Phones
• PDAs
• System Legacy Support
PIN ASSIGNMENTS
24
25
17
16
E3DATA
RxD
TxD
SCLK
SDATA
_PWR_OFF
_CTS/_ATN
CONF0
UR6HCPS2-SP40-FG
LQFP
RES0
LED0
LED1
LED2
LED3
VSS
_OSCOUT
OSCIN
Each of four external PS/2 ports
also support more than 140 key
scan codes including international
language keys, internet keys, and
power keys. The PS2AdaptTM also
offers 4 reserved pins for LED
functions, their functions can be
customized by Semtech.
32
1
9
8
PS2Adapt is a trademark of Semtech Corp. All
other trademarks belong to their respective
companies.
Copyright Semtech, 2000-2001
DOC6-PS2-SP40-DS-102
1
www.semtech.com






UR6HCPS2-SP40 Datasheet, Funktion
REPORTS
Overview
The PS2AdaptTM UR6HCPS2-SP40
will report three types of package
formats for relative mouse, absolute
mouse and keyboard report
respectively.
Each mouse packet contains 4
bytes; keyboard packet contains 2
bytes. The 7th bit of each byte is
used for synchronization. The 7th
bit for the first byte is 1 and for the
other bytes is 0.
Keyboard Data Report
8-bit key number (K0-K7) is an
identification of a keyboard key,
which is defined in the USAR key
table (see Page 7).
PS/2 Mouse Data Report
There are two different kinds of
mouse data packages for the
external PS/2 devices. One is
absolute mode that is for
touchscreens and the other is
relative mode for standard PS/2
devices, including MouseWheel.
The resolution for the absolute
mouse is 10 bits (1000 points) in X
and Y direction.
The relative mouse data format
takes into consideration the 5-
button and MouseWheel devices.
Keyboard Package Format
Byte # 7
11
20
6
1
KBD
K6
Bit Number
543
Not Caps Num
Assigned Lock Lock
1:On 1:On
/0:Off /0:Off
K5 K4 K3
2
Scroll
Lock
1:On
/0:Off
K2
10
1:Make K7
/0:Break
K1 K0
Absolute Mode PS/2 Mouse Package Format
Byte # 7
11
20
30
40
6
0
Mouse
Y9
X6
Y6
Bit Number
5 4 3 2 10
0 0 0 0 00
Absolute 1 penup 1 penup 1 penup 1 penup 1 penup
Y8 Y7 X*
X9 X8 X7
X5 X4 X3 X2 X1 X0
Y5 Y4 Y3 Y2 Y1 Y0
Note 4: The bits that are marked with X* are reserved for future use. Now the value given is
zero.
Relative Mode PS/2 Mouse Package Format
Byte # 7
11
20
30
40
6
0
Mouse
X6
Y6
X*
5
1
Relative
X5
Y5
B5
Bit Number
43
Ysign Xsign
X4 X3
Y4 Y3
B4 Z3
2
M
X2
Y2
Z2
10
RL
X1 X0
Y1 Y0
Z1 Z0
Note 5: The bits that are marked with X* are reserved for future use. Now the value given is
zero.
Copyright Semtech, 2002-2001
DOC6-PS2-SP40-DS-102
6
www.semtech.com

6 Page









UR6HCPS2-SP40 pdf, datenblatt
ASYNCHRONOUS SERIAL INTERFACE (ASI) MODE
Baud rate:
The PS2AdaptTM implements the ASI mode at fixed preselected Baud rates: 300bps, 600bps, 1200bps, 9600bps,
19200bps, 31250bps and 62500bps, depending on the Configuration pinsstate on power up. The IC can achieve
these standard Baud rates by using a 4MHz oscillator.
Protocol:
In Serial mode, the PS2AdaptTM supports transmission in one direction only (IC to Host). The IC starts the
transmission to the system when it has mouse/keyboard package pending. The data format is one start bit, 8 data
bits, no parity and one stop bit.
1. The UR6HCPS2-SP40 asserts _CTS low to indicate that a packet transfer will start.
2. The Host asserts _RTS low to indicate that it is ready to receive data.
_RTS low means that system can receive data (e.g. UART is operational).
3. The UR6HCPS2-SP40 places data on TXD line when it detects the _RTS low.
4. When one package is successfully transmitted, the IC raises _CTS.
Notes on the Protocol:
To assure fast transmission, the system must assert _RTS low as soon as possible. If the system is ready to receive
the data, it doesn't have to raise _RTS between packages.
The UR6HCPS2-SP40 checks _RTS after every byte transmission. If _RTS returns to high, it means that the
transmission was unsuccessful. The IC will raise _CTS to abort the transmission and the entire package will be re-
transmitted.
The maximum time of T1 is 10ms. If the system cannot assert _RTS low after 10ms of _CTS low, the IC will raise
_CTS to abort the transmission request. After that, the PS2AdaptTM will try to start the transmission again.
_CTS
_RTS
TXD
Figure 1: Serial Transmission Timing
t1
1st
Byte
Last
Byte
Copyright Semtech, 2002-2001
DOC6-PS2-SP40-DS-102
12
www.semtech.com

12 Page





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