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FAN8621B Datasheet(PDF) 11 Page - Fairchild Semiconductor |
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FAN8621B Datasheet(HTML) 11 Page - Fairchild Semiconductor |
11 / 21 page FAN8621B 11 Application Informations General The FAN8621B is a stand alone combination chip consisting of Spindle Motor (SPM) and Voice Coil Motor (VCM)circuit for HDD applications. The speed control of SPM is achieved by internal Synchronous Phase Locked Loop (SPLL). The FAN8621B supplies adjustable regulated power with external component and signals READY indicating SPM is locked within some speed range (typically ±0.7% speed error). Current set point is applied by two PWM signals and VCM current is monitored by external sense resistor. VCM circuit generates 4 voltage references for testing. Fig.1 shows overall interfacing of FAN8621B with external and HDD motors Figure 1. Overall Interfacing of the FAN8621B The control signals have three status and their function is summarized as follows; Table 1. Control PIN function Notes: 1. SPM bias + SPM Output Driver enable 2. Makes SPM Open Loop (Start-up) Commutation Signal 3. Test Only when READY is low Pin Status Signals HZ L CNTL1 SPM enable(1) bias enable disable Brake disable disable enable CNTL2 Commutation hard Hard soft Start Clock high(2) low(2) - CNTL3 VCM enable disable disable Retract disable disable enable GAINSEL Start-up hold normal normal hold(3) Sense Amp gain 2 2 8 Power Power Power Power Management Management Management Management SPM SPM SPM SPM VCM VCM VCM VCM Retract/Brake DIGITAL DIGITAL DIGITAL DIGITAL ASIC ASIC ASIC ASIC Interface Interface Interface Interface POR CNTL1 CNTL2 CNTL3 PWMH PWML GAINSEL READY FG VCMREF4V Vreg3.3 RPMSEL TSD CLK |
Similar Part No. - FAN8621B |
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Similar Description - FAN8621B |
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