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  Microchip Technology Semiconductor Electronic Components Datasheet  

ECE1105 Datasheet

23 x 8 Keyscan Matrix Interface via SMBus or BC-Link Bus

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ECE1105
GPIO Expansion, PS/2, 23x8 Keyscan Matrix Interface via
SMBus or BC-Link Bus
Highlights
Features
The ECE1105 is a 48-Pin 3.3V Keyboard Scan Expan-
sion or GPIO Expansion device. The device supports a
keyboard scan matrix of 23x8 and has two PS/2 ports
for touchpad and/or pointer stick support. The device is
connected to a Master via the BC-Link interface or via
the SMBus.
KSI and KSO signals are multiplexed with GPIOs.
• Up to 23x8 Keyboard Scan Matrix
• Two PS/2 Ports
- Touch Pad Support
- Pointer Stick Support
• 40 Multiplexed General Purpose I/O pins
- All are MCU addressable I/O Pins
• BC-Link Interconnect Bus
- Link to embedded controller
• SMBus Interconnect
- One of two address selection
• 3.3V Operation
- 48-Pin, QFN RoHS Compliant package
- 0.5mm Pitch
- 7x7m Body size
Block Diagram
BC Bus
SMBus
BC Bus /
SMBus
Autodetect
LSBC Bus
Interface
SMBus
Interface
LSBC_INT#
SMBus_INT#
Internal VCC1
PWRGD
GPIO[0:39 ]
Registers
Muxed with
KSO & KSI
Status
Mask
Expander
Base
register
Output
Control
registers
5
5 to 23
Mux
KSO[22:00]
KSI
register
8
KSI[7:0]
8
Mask
Register
KSI[7:0]
VCC1 POR
PS2
Interface
PS2_CLK
PS2_DAT
TB_CLK
TP_DAT
2008-2018 Microchip Technology Inc.
DS00002622A-page 1


  Microchip Technology Semiconductor Electronic Components Datasheet  

ECE1105 Datasheet

23 x 8 Keyscan Matrix Interface via SMBus or BC-Link Bus

No Preview Available !

ECE1105
TO OUR VALUED CUSTOMERS
It is our intention to provide our valued customers with the best documentation possible to ensure successful use of your Microchip
products. To this end, we will continue to improve our publications to better suit your needs. Our publications will be refined and
enhanced as new volumes and updates are introduced.
If you have any questions or comments regarding this publication, please contact the Marketing Communications Department via
E-mail at docerrors@microchip.com. We welcome your feedback.
Most Current Data Sheet
To obtain the most up-to-date version of this data sheet, please register at our Worldwide Web site at:
http://www.microchip.com
You can determine the version of a data sheet by examining its literature number found on the bottom outside corner of any page.
The last character of the literature number is the version number, (e.g., DS30000000A is version A of document DS30000000).
Errata
An errata sheet, describing minor operational differences from the data sheet and recommended workarounds, may exist for cur-
rent devices. As device/documentation issues become known to us, we will publish an errata sheet. The errata will specify the
revision of silicon and revision of document to which it applies.
To determine if an errata sheet exists for a particular device, please check with one of the following:
• Microchip’s Worldwide Web site; http://www.microchip.com
• Your local Microchip sales office (see last page)
When contacting a sales office, please specify which device, revision of silicon and data sheet (include -literature number) you are
using.
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DS00002622A-page 2
2008-2018 Microchip Technology Inc.


Part Number ECE1105
Description 23 x 8 Keyscan Matrix Interface via SMBus or BC-Link Bus
Maker Microchip
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