UR7HCDMP-A-DW(V4) Просмотр технического описания (PDF) - Semtech Corporation
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UR7HCDMP-A-DW Datasheet PDF : 12 Pages
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AUTODETECT
At power-up the HulaCoder™
automatically detects the host
interface type (PS/2 or serial), and
uses the correct protocol.
PS/2 MODE
At start-up or upon receiving a reset
command, clock and data lines of
the HulaCoder™ can be pulled to a
positive level. The IC then waits
between 300 and 500 milliseconds
before sending an 0xAA to the host
followed by a device ID of 0x00.
Then the IC sets itself to its default
values, i.e. Incremental Stream
Mode with 1:1 scaling, and a report
rate of 100 Hz. The device then
disables itself until it receives a
command from the host.
ERROR HANDLING
For every correct command or
parameter received from the host,
the HulaCoder™ sends an
Acknowledge (0xFA). If an invalid
command or parameter is received,
the HulaCoder™ issues a Resend
Request (0xFE). If an invalid input
is again received, the device
transmits an Error Code (0xFC) to
the host. Both Error and Resend
Request responses are sent by the
device within 25 milliseconds. The
host may not issue any new
commands until either the
HulaCoder™ has responded or 25
milliseconds have elapsed.
PIN DESCRIPTION
Pin Numbers
Mnemonic
Pin
CHX
1
RTS
2
_TxD
3
_RESET
4
GND
5
PS2CLK
6
PS2DAT
7
_RIGHTSW
8
_LEFTSW
9
_MIDDLESW
10
DA0
11
DA1
12
DA2
13
VCC
14
_OSCOUT
15
OSCIN
16
_PWRON
17
CHY
18
Type
Analog Input
I/O
O, Open Drain
I
Power
I/O
I/O
I w/ Pullup
I w/ Pullup
I w/ Pullup
O
O
O
Power
O
I
O
Analog Input
Name and Function
Horizontal input
Ready To Send (RTS) sense,
power save out
Transmit serial data
Reset: apply 0 V for orderly start
up.
Ground
PS/2 clock
PS/2 data
Right switch: low = on
Left switch: low = on
Middle switch: low=on
Resolution enhancement
D/A 0: least significant bit (LSb)
Resolution enhancement
D/A 1
Resolution enhancement
D/A 2: most significant bit (MSb)
Power supply
Oscillator output
Oscillator input
Sensor power strobing
control
Vertical input
Note: An underscore before a pin mnemonic denotes an active low signal.
PIN DESCRIPTION NOTES
The internal oscillator has a built-in feedback resistor. Only one external
component is needed for clock generation. Semtech recommends a 4.00
MHz ceramic resonator with built-in load capacitors.
RIGHTSW, LEFTSW, and MIDDLESW inputs have built-in pull-up resistors.
No additional components are required for a three-button design. However,
if high levels of ESD and EMI are expected, then series protection resistors
(47 Ohms to 1K Ohms) are recommended between the switches and the
switches’ inputs on the IC.
Copyright ©1995-2002 Semtech Corporation
3
DOC7-DMP-DS-109
www.semtech.com
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