ECE1117 datasheet(4/83 Pages) MICROCHIP

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ECE1117

DS00001860D-page 4

 2014 - 2015 Microchip Technology Inc.

1.0

GENERAL DESCRIPTION

The ECE1117 is a 48-pin 3.3V multi-function companion device. The ECE1117 communicates with the upstream host

via BC-Link or SMBus.

The typical usage model is to locate the ECE1117 in the keyboard assembly. By mounting the ECE1117 onto the key-

board assembly, the keyboard signals as well as the touchpad/point stick PS/2 signals and the backlight PWMs are

routed from the keyboard to the motherboard over a single BC-Link connection. In all other notebook designs without

BC companion device, the keyboard matrix signals, PS/2 and LEDs are routed to the motherboard via a wide ribbon

extension for the keyboard switch circuit.

1.1

Block Diagram

The ECE1117 has a single Power Source VCC and a single digital ground VSS. There are two power domains VCC and

VCC_1.8.

See Section 3.0, " Power, Clocks and Resets," on page 22 for additional details about clocks and power.

FIGURE 1-1:

ECE1117 BLOCK DIAGRAM

SMB_DAT_UP

SMB_CLK_UP

BC_DAT_UP

Internal Address / Data Bus

VCC

RESGEN

Internal VCC PWRGD

LED

GPIO

BC-

LinkTM

Slave

SMBus

Slave

BC-LinkTM / SMBus

Autodetect

Regulator

VR_CAP

TEST

10 Mhz Oscilator

10 MHz

OSC_TRIM

OPT

Trim

Internal

Registers

GPIO[00:01, 03:06,

11:15, 20:23]

PWM[1:4, 7:9]

BC_INT_UP#

SMB_INT_UP#

BC_CLK_UP

Wake/Interrupt logic

10MHz

Clocked by BC_CLK_UP 3MHz max

Clocked by 10Mhz RO

Wakeup logic and all

wakeup event

sources require no

clocks to initiate

wakeup events.

Wake

Key-

board

Matrix

Scan

KSO[00:06, 11:22]

KSI[0:7]

Strap

Options

SMB_ADDR

10MHz

PS2_CLK, TP_CLK

PS/2

PS2_DAT, TP_DAT

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