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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