Acer 420 User Manual
Page 37
Chapter 1
29
There are two control signals that come form system to control lamp brightness. One signal is
named DAC_BRIG, which limits current to meet LCD lamp current specification. Another one is
named PWM, which adjusts lamp brightness. This inverter brightness is adjusted by PWM burst
mode. The PWM burst mode is that turning on and off the lamp at rate of 150Hz. The effective
brightness is a function of the duty cycle.
Features
1. Wide range 9V to 21V input voltage.
2. Birghtness adjustment by PWM duty mode.
3. Close loop controls lamp current.
Windows logo key
Yes
Internal & external keyboard work simultaneously
Yes
Battery
Item
Specification
Vendor & model name
Sanyo/Sony/Panasonic
Battery Type
Li-ion
Pack capacity
69.93Wh
Cell voltage
3.7V/cell
Number of battery cell
9
Package configuration
Pin 1,2: BATT+: Battery positive power pin
Pin 3: Floating pin (3S3P)
Pin 4: B/I: Enable LI-ion battery output, connect to 1k
resistor to
GND in system.
Pin 5: TS: connect 10K
ohm Thermistor to GND
Pin 6: EC_SMD1: SMbus DATA
Pin 7: EC_SMC1: SMbus CLOCK
Pin 8, 9: GND: battery ground power pin
Package voltage
11.1V
LCD Inverter Specification
This inverter is designed to light up the CCFL of LCD for TravelMate 420 series notebook. It should be
supported the following LCD panels.
No.
Supplier
Model
Type
1
AU
UB141X01
TFT, 14.1” XGA
2
CPT
CLAA141XF01
TFT, 14.1” XGA
3
AU
B150PG01
TFT, 15.0 SXGA+
4
Hitachi
TX38D91VC1FAC
TFT, 15.0” SXGA+
5
AU
B150XG01
TFT, 15.0” XGA
6
IBM
ITSX95C
TFT 15.0” SXGA+
7
Hannstar
HDS150PX14-A
TFT 15.0” XGA
Keyboard
Item
Specification
Ω
Ω
SG_TM420_Ch1.fm Page 29 Thursday, September 26, 2002 9:23 AM