Acer Aspire 2000 Aspire 2000 Notebook Service Guide - Page 35

Battery Item Cell voltage Number of battery cell Package configuration Package voltag 3.7V/cell 8 Specification Pin 1: BATT+: Battery positive power pin Pin 2: N/A Pin 3: B/I: Enable Li-ion battery output, connect to 1k Ω resistor to GND in system. Pin 4: TS: Detector Battery Pin 5: EC_SMD1: N/A Pin 6: EC_SMC1: SMbus CLOCK Pin 7: GND> EC_SMD1=SMbus DATA Pin8: GND> Battery Ground Power Pin LCD Inverter Specification No. Supplier 1 CMO 2 LG 3 Samsung 4 LG Model NI54I1-L02 LP154W01-A3 LTN154X1-L02 LP154W02-A1 Type 15.4" WXGA 15.4"WXGA 15.4" WXGA 15.4"WSXGA+ 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. 28 Chapter 1