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L6260 数据表(PDF) 4 Page - STMicroelectronics |
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L6260 数据表(HTML) 4 Page - STMicroelectronics |
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4 / 30 page  PIN DESCRIPTION (continued) Pin Types: I = Input, O = Output, P = Power, A = Analog (passive) VCM Driver and DAC PIN # PIN NAME DESCRIPTION PIN TYPE I\O MAPPED? TRI-STATE @SLEEP/@POR 53 VCM_I_SNS1 High side of VCM sense resistor network. This pin provides the current to the network as well as sensing the total voltage across both sense resistors. Sensing the total drop across both resistors results in the low transconductance gain feedback used for track following. ANo No 56 VCM_I_SNS2 Sensing across the lower VCM sense resistor for high transconductance gain feedback for seek operations. ANo No 6 VCM_COMP VCM compensation network. Typically, 200K Ω in series with 100nF is connected from this pin to Ground. ANo No 57 VCM_PLUS VCM Power Amplifier positive output terminal A No No 55 VCM_MINUS VCM Power Amplifier negative output terminal A No No 46 PARK_V A resistor conneced between this pin and VCM_PLUS determines the Parking Voltage ANo No 35 VPARKOUT Output from the retract circuit. This pin is usually directly connected to the VCM_MINUS. AO No No Spindle Driver and DAC PIN # PIN NAME DESCRIPTION PIN TYPE I\O MAPPED? TRI-STATE @SLEEP/@POR 40 SPN_SLEW The External.Spindle Driver Slew Rate resistor (Rslew), typically 250K is connected from this pin to Ground. When in nExternal Slew Rate Mode (System Control Register B, Bit 10=0), the slew rate is determined by: Slew Rate = (0.5V to Rslew) X (DAC slew +1) +20pF DAC slew = System Control Register bits 7 - 9. ANo No 36 SPN_I_COMP A seroies RC network from this pin to ground sets the spin driver compensation. Typical a single 4nF capacitor will provide adequate compensation. ANo No 14 SPN_I_SNS A current sensing resistor (2.5K Ω Typical ).is connected from this pin to ground. See the Circuit Operation section for details. AO No No 20 COIL_A Spindle Power Amplifier output A. Also serves as BEMF sensing for Phase A. ANo No 25 COIL_B Spindle Power Amplifier output B. Also serves as BEMF sensing for Phase B. ANo No 29 COIL_C Spindle Power Amplifier output C. Also serves as BEMF sensing for Phase C. ANo No 59 CTAP Spindle Motor Center Tap connection A No No 22 SYNTH_HALL CMOS level spindle speed output. When SYNHALL (System Control Register B, bit 5) is set to 0, this output switches state at every zero crossing of any phase. With SYNHALL = 1, the output only switches every zero crossing of Phase A. DO Yes Yes 37 SPD_COMP Change Pump RC network connection pin for FLL mode operation. ANo No 38 SPD_COMP_S HT This pin allows for shorting of to the Charge Pump Network resistor. This operation provides a quick charge on the Charge Pump capacitor, reducing settling time once desired speed is reached. Operation is controlled by bit 9 of System Control Register A. ANo No 39 FLL_RES Frequency Locked Loop charge pump gain resistor. (Rep), typically 12.5K Ω , is connected from this pin to Ground. Change Pump current is determined by: I = (0.5V to Rcp) X (FLLGAIN DAC +1) FLLGAIN DAC = System Control Register B bits 0-4 ANo No L6260 4/30 |
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