UR6HCPS2-SP40 Datasheet, PDF (3/22 Pages) Semtech Corporation – Converts PS/2 Data to Serial or SPI

FUNCTIONAL DESCRIPTION
The PS2Adapt^TM consists
functionally of three major sections.
These are the Dual Mode Serial
Communications Interface, the
Power Management Unit, and the
HID Manager. All sections
communicate with each other and
operate concurrently.
HID MANAGER
The UR6HCPS2-SP40 Human Input
Device (HID) Manager is
responsible for the configuration
and handling of HID devices that
are attached to the controller
through the four external PS/2 ports.
The HID Manager has the following
responsibilities:
1. Initialize PS/2 keyboards and
mice
2. Mix the information from external
PS/2 devices
3. Formatting and relaying reports of
the HID devices to the Host.
OPERATIONS BELOW 5 V
The standard PS/2 devices are
specified for supply voltage of 5V.
Operations of the UR6PS2-SP40 at
a lower voltage (3V) are only
possible if the HID devices
connected to ALL external PS/2
ports are capable of 3V operations.
PIN DEFINITIONS
Pin Numbers
Mnemonic
Power Supply
VDD
VREF
VSS
VSS2
_RESET
Oscillator Pins
OSCIN
_OSCOUT
PS/2 Ports
E0CLK
E0DATA
E1CLK
E1DATA
E2CLK
E2DATA
E3CLK
E3DATA
System Status
Monitoring
_PWR_OFF
X_PWR
Communication
Interface
_SS/_RTS
_ATN/_CTS
LQFP Type
8
PWR
5
AI
11
PWR
7
PWR
6
I
9
I
10
O
18
I/nD
19
I/nD
20
I/nD
21
I/nD
22
I/nD
23
I/nD
24
I/nD
25
I/nD
30
I±Int
4
AI
17
I_Int
31
O
TXD
RXD
SDATA
SCLK
27
O
26
I
29
28
I
Name and Function
Positive Supply Voltage: +3V-+5V
Positive Analog Ref Voltage
Ground: analog signal
Ground: negative supply voltage
Hardware Reset Pin:
at Low-level, this pin holds the
UR6HCPS2-SP40 in a reset state.
Oscillator input: connect ceramic
resonator with built-in load capacitors
or CMOS clock from external oscillator
4 MHz operating frequency
Oscillator Output: connect ceramic
resonator with built-in load capacitors
or keep open if external oscillator
is used
PS/2 Clock: for External Device 0
PS/2 Data: for External Device 0
PS/2 Clock: for External Device 1
PS/2 Data: for External Device 1
PS/2 Clock: for External Device 2
PS/2 Data: for External Device 2
PS/2 Clock: for External Device 3
PS/2 Data: for External Device 3
Power Off Signal: capable of
Interrupt on both Positive and Negative
edges
External PS/2 Device Power
Detector
Ready_To_Send: Active-Low
signal Input.Low-level indicates that
the Host System is ready to send
data from UR6HCPS2-SP40.
Attention (SPI Mode) or
Clear_To_Send (Asynchronous
Serial Mode ): Active-Low signal
Output. Low-level indicates that the
UR6HCPS2-SP40 has data to send to
the Host System
Transmit Data (Asynchronous
Serial Mode): Idle = "High" = 1
Receive Data (Asynchronous
Serial Mode): Reserved future use
Master-In-Slave-Out (SPI Mode):
keep open for ASI mode or tie to Gnd
Serial Clock (SPI Mode): in SPI
Mode, use the following Clock
sequence:Idle-high/ Negative-Edge
(Shift Data) \ Positive-Edge (Latch
Data), Idle-High. Keep open or tie to
Gnd for ASI mode
Copyright Semtech, 2002-2001
3
DOC6-PS2-SP40-DS-102
www.semtech.com