VDD R4 0.01, 1% VBAT R5 10M - E2 U2 VL/CHRG R1 22K GND R2 22K R8 100K R9 100K U1 INT GND 8 Q7 7 11 D0 12 D1 D7 6 D6 5 13 D2 14 D3 D5 4 D4 3 15 CE 16 VCC CP 2 PL 1 C2 0.1 D SCK CS R10 100K CD74HCT165M R11 100K 3 2 GND 7 POL 6 Q3 2N7002 1 LTC4150CMS E5 J1 SHDN E6 CLR 3 CLR 4 CF5 SHDN C1 4.7UF 0805 E7 INT E8 POL Q4 2N7002 MISO MOSI 1 POL SHDN JP1 SD SELF CLR RUN JP2 SC 2 SHDN 0805 Q2 2N7002 1 9 Q7 10 DS 2 C3 4.7UF VCC 3 R7 100K 2 R6 100K C R3 22K Q1 2N7002 1 1 SENSE+ INT 10 2 SENSE- CLR 9 3 CF+ VDD 8 1 VCC E1 3 D 2 R12 100K EESDA EXT CLR E10 CS VCC C GND R15 5.1K R14 475 R16 5.1K U3 3 3 RED DISCHARGE LED1 QTLP600C-74 3 Q6 2N7002 2 1 2 Q5 2N7002 6 6 8 8 1 2 4 GREEN CHARGE 1 5 5 7 7 E9 SCK HD2X7-079-MOLEX R13 475 POL 2 2 4 4 9 9 10 10 11 11 12 12 13 13 14 14 EESCL VCC B VCC 1 1 3 3 1 A0 2 A1 VCC 8 WP 7 3 A2 4 VSS SCL 6 SDA 5 C4 0.1 TP1 24LC025 1 3 B R17 5.1K 2 E4 GND + 3 - E3 VBAT 4 + 5 Q7 2N7002 1 VSS 2 SHDN CUSTOMER NOTICE NOTES: UNLESS OTHERWISE SPECIFIED A 1. ALL RESISTORS ARE IN OHMS, 0402. ALL CAPACITORS ARE IN MICROFARADS, 16V, 0402. 2. INSTALL SHUNT ON JP1-JP2 PIN 1 AND 2. LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. CONTRACT NO. APPROVALS DRAWN: CHECKED: TITLE: APPROVED: ENGINEER: DILIAN R. DESIGNER: 4 3 DATE: 2 SCHEMATIC COULOMB COUNTER/BATTERY GAS GAUGE SIZE A THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 TECHNOLOGY KIM T. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 LTC Confidential-For Customer Use Only DWG NO. REV DC756A-1 * LTC4150CMS Monday, June 21, 2004 SHEET 1 A 1 OF 1 A