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UR5HCSPI-FN 데이터시트 PDF




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부품번호 UR5HCSPI-FN 기능
기능 Zero-PowerTM Keyboard Encoder & Power Management IC for H/PCs
제조업체 Semtech Corporation
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UR5HCSPI-FN 데이터시트, 핀배열, 회로
SPICoderTM UR5HCSPI
Zero-PowerTM Keyboard Encoder &
Power Management IC for H/PCs
HID & SYSTEM MANAGEMENT PRODUCTS, H/PC IC FAMILY
DESCRIPTION
The SPICoderTM UR5HCSPI
keyboard encoder and power
management IC is designed
specifically for handheld PCs
(H/PCs). The off-the-shelf
UR5HCSPI will readily work with
CPUs designed for Windows CE®,
saving OEMs significant
development time and money as
well as minimizing time-to-market for
the new generations of handheld
products.
Three main design features of the
UR5HCSPI make it the ideal
companion for the new generation
of Windows CE® -compatible,
single-chip computers: low-power
consumption; real estate-saving
size; and special keyboard modes.
FEATURES
• SPI-compatible keyboard encoder
and power management IC with
other interfaces available
• Compatible with Windows CE®
keyboard specification
• Zero-PowerTM — typically
consuming less than 2µA,
between 3-5V
• Offers overall system power
management capabilities
APPLICATIONS
• StrongARMTM Handheld PCs
• Windows CE® Platforms
• Web Phones
PIN ASSIGNMENTS
• Compatible with “system-on silicon”
CPUs for H/PCs
• Special keyboard and power
management modes for H/PCs,
including programmable “wake-up”
keys
• Scans, debounces, and encodes
an 8 x 12 matrix and controls
discrete switches and LED
indicators
• Custom versions available
• Personal Digital Assistants (PDAs)
• Wearable Computers
• Internet Appliance
“Quasi” Zero-PowerTM consumption
(less than 2µA @ 3V), a must for
H/PCs, provides the host system
with both power management and
I/O flexibility, with almost no battery
drainage.
Finally, special keyboard modes
and built-in power management
features allow the SPICoderTM to
operate in harmony with the power
management modes of Windows
CE®, resulting in more user flexibility
and longer battery life.
33 23
34
_PWR_OK
22 NC
NC0
LED2
OSCO
LED1
OSCI
Vcc
UR5HCSPI-FB
LED0
_IOTEST
NC QFP
Vss
NC NC
_RESET
R7
_WKU
R6
Vx R5
C7
44
1
R4
12
11
6
C5 7
40
1 39
C4
C3
C2
C1
UR5HCSPI-FN
C0 12
PLCC
34
R0
R1
R2
R3
R4 17
29
18 23 28
_PWR_OK
_ATN
_SS
SCK
MOSI
MISO
XSW
SW0
C8
C9
C10/WUKO
The UR5HCSPI also offers
programmable features for wake-up
keys and general purpose I/O pins.
SPICoder is a trademark of Semtech Corp. All
other trademarks belong to their respective
companies.
Copyright Semtech 1997-2001
DOC5-SPI-DS-117
1
www.semtech.com




UR5HCSPI-FN pdf, 반도체, 판매, 대치품
PIN DESCRIPTIONS
VCC and VSS
VCC and VSS are the power
supply and ground pins. The
UR5HCSPI will operate from a 3-5
Volt power supply. To prevent noise
problems, provide bypass
capacitors and place them as
close as possible to the IC with the
power supply. VX, where available,
should be tied to Vcc.
OSCI and OSCO
OSCI and OSCO provide the input
and output connections for the on-
chip oscillator. The oscillator can
be driven by any of the following
circuits:
- Crystal
- Ceramic Resonator
- External Clock Signal
The frequency of the on-chip
oscillator is 2 MHz.
_RESET
A logic zero on the _RESET pin will
force the UR5HCSPI into a known
start-up state. The reset signal can
be supplied by any of the following
circuits:
- RC
- Voltage monitor
- Master system reset
MOSI, MISO, SCK, _SS, _ATN
These five signals implement the
SPI interface. The device acts as a
slave on the SPI bus. The _SS
(Slave Select) pin should be tied to
ground if not used by the SPI
master. The _ATN pin is asserted
low each time the UR5HCSPI has a
packet ready for delivery. For a
more detailed description, refer to
the SPI Communication Channel
section on page 9.
_IOTEST and _WKU
Input Output Testand Wake Up
pins control the stop mode exit of
the device. The designer can
connect any number of active low
signals to these two pins through a
17K resistor, in order to force the
device to exit the stop mode. A
sample circuit is shown on page 15
of this document.
All the signals are wire-anded.
When any one of these signals is
not active, it should be floating (i.e.,
these signals should be driven from
open-collectoror open-drain
outputs). Other configurations are
possible; contact Semtech.
R0-R 7
The R0-R7 pins are connected to
the rows of the scanned matrix.
Each pin provides an internal pull-
up resistor, eliminating the need for
external components.
C0-C9
C0 to C9 are bi-directional pins
connected to the columns of the
scanned matrix. When a column is
selected, the pin outputs an active
low signal. When the column is de-
selected, the pin turns into high-
impedance.
C10/WUKO
The C10/WUKO pin acts
alternatively as column scan output
and as an input. As an input, the
pin detects the Wake-Up Keys
Onlysignal, typically provided by
the host CPU to indicate that the
user has turned the unit off. When
the device detects an active high
state on this pin, it feeds this
information into the Keyboard State
Controlunit, in order to disable the
keyboard and enable the
programmed wake-up keys.
C11/_LID
The C11/_LID pin acts in a similar
manner to the C10/WUKO. This pin
is typically connected to the LID
latch through a 150K resistor, in
order to detect physical closing of
the device cover. When the pin
detects an active low state in this
input, it feeds this information into
the Keyboard State Controlunit, in
order to disable keys inside the
case and enable only switches
located physically on the outer
body of the H/PC unit.
LED0, LED1 and LED2
These three pins provide an active
low drive for LED indicators. The
programming of these pins is
explained in the LEDs section on
page 8 of this document.
Copyright Semtech 1997-2001
DOC5-SPI-DS-117
4
www.semtech.com

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UR5HCSPI-FN 전자부품, 판매, 대치품
KEYBOARD STATES
These states of operation refer only
to the keyboard functionality and,
although they are related to power
states, they are also independent of
them.
"Send All Keys"
Entry Conditions: Power on reset,
soft reset, PWR_OK =1,
{(LID=1) AND (WUKO=0)}
Exit Conditions: PWR_OK = 0 ->
"Send No Keys"(WUKO=1) AND
(Key Press) -> "Send Wake-Up
Keys Only"(LID = 0) AND
(WUKO=0) AND (Key Press) ->
"Send XSW Key Only"
Description: This is the UR5HCSPIs
normal state of operation, accepting
and transmitting every key press to
the system. This state is entered
after the power-on and is sustained
while the unit is being used.
“Send Wake-Up Keys Only”
Entry Conditions:(WUKO=1) AND
(Key or Switch press)
Exit Conditions: Soft Reset -> Send
All KeysPWR_OK = 0 -> Send No
Keys
Description:This state is entered
when the user turns the unit off. A
signal line driven by the host will
notify the UR5HCSPI about this
state transition. While in this state,
the UR5HCSPI will transmit only
keys programmed to be wake-up
keys to the system. It is not
necessary for the UR5HCSPI to
detect this transition in real time,
since it does not effect any
operation besides buffering
keystrokes.
(LID = 0) AND (WUK0=0)
Send
AND Key Press
XSW Key
Only
Send All
(LID = 1) AND (WUKO=0) Keys
AND Key Press
WUKO=1
AND Key Press
WUKO =1
AND Key
Press
Soft Reset
(PWR_OK =1)
AND (LID = 0)
AND (WUKO=0)
AND Key Press
PWR_OK
PWR_OK
(PWR_OK =1)
AND (WUKO=0)
AND (LID=1)
AND Key Press
PWR_OK = 0
Send Wake
Up Keys
Only
PWR_OK
(PWR_OK =1) AND Key Press
AND (WUKO = 1)
Send
No Keys
Figure 2: The UR5HCSPI implements four modes of keyboard and switch operation.
“Send No Keys"
Entry Conditions:PWR_OK
transition from high to low
Exit Conditions: (PWR_OK = 1)
AND (Matrix key pressed OR
Switch OR _WKUP)
Description: This state is entered
when a PWR_OK signal is asserted
(transition high to low), indicating a
critically low level of battery
voltage. The PWR_OK signal will
cause an interrupt to the
UR5HCSPI, which guarantees that
the transition is performed in real
time. While in this state, the
UR5HCSPI will perform as follows:
1. The LED will be turned off.
Nevertheless, its state is saved and
will be restored after exiting the
disabled state (change of
batteries).
2. The UR5HCSPI will enter the
STOP mode for maximum energy
conservation.
3. Stop mode time-out entry will be
shortened to further conserve
energy.
4. While in this state all interrupts
are disabled. The UR5HCSPI will
exit this state on the next interrupt
event that detects the PWR_OK line
has been de-asserted.e
“Send XSW Key Only"
Entry Condition: (LID=0) AND
(WUKO=0) AND (Key Press)
Exit Condition: (LID=1) AND
(WUKO=0) AND (Key Press) ->
Send All KeysPWR_OK = 0 ->
Send No Keys
(WUKO = 1) AND (Key Press) ->
Send Wake Up Keys Only
Description: This state is entered
upon closing the lid of the device.
While in this state, the encoder will
transmit only the XSW key, which is
located outside the unit. This
feature is designed to
accommodate buttons on the
outside of the box, such as a
microphone button, that need to be
used while the lid is closed.
Copyright Semtech 1997-2001
DOC5-SPI-DS-117
7
www.semtech.com

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