G764/G765 Global Mixed-mode Technology Fan Speed Controller with Linear or PWM Mode Features General Description The G764/G765 is a single chip solution for fan speed control. It can be directly connected to the fan and performs close-loop or open-loop control. And there are two modes, PWM and linear, to drive the fan. It determined the current fan speed based on the fan rotation pulses and an externally supplied clock. The desired fan speed is programmed via the SMBus. The actual fan speed and fan status can be read via the SMBus. Short-circuit protection is implemented to prevent damages to the fan and the IC itself. SMBus Interface Linear or PWM Mode Speed Control Open or Close Loop Fan Speed Control Supply Voltage Range 3V~5.5V ADD0 Pin to Select 3 Different SMBus Addresses SMBus Alert # for G765 G765 has Built-in Inverter for Crystal Oscillator Internal 32kHz clock generator, +/- 3% accuracy SOP-8/MSOP-8 for G764 MSOP-10 for G765 Applications Ordering Information Notebook PC Industrial PC LAN Switch Servers Telecom equipment Industrial Control ORDER NUMBER MARKING TEMP. RANGE PACKAGE (Green) G764P11U G764P81U G765P71U G764 G764 G765 -55°C to +125°C -55°C to +125°C -55°C to +125°C SOP-8 MSOP-8 MSOP-10 Note: P1: SOP-8 P8: MSOP-8 1: Bonding Code U: Tape & Reel P7:MSOP-10 Pin Configuration G764 G765 FOUT 1 8 VCC FG 2 7 SDA ADD0 3 6 SCL GND 4 5 CLK SOP-8/MSOP-8 FOUT 1 10 VCC FG 2 9 SDA ADD0 3 8 SCL ALERT# 4 7 X2 GND 5 6 CLK MSOP-10 TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.4 Nov 07, 2011 1