如何使用静音驱动芯片TMC2208替代Allegro_A4988

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德国TRINAMIC公司开发的TMC2208可以完全兼容A4988芯片,此外TMC的芯片带有stealthchop静音步进电机驱动功能
AN45: How to replace Allegro A4988 with TMC2208 Application Note Document Revision V1.3. 201 8-Jan-30 3/5 (a)IO Config: Using 2, 4, 1 6 microsteps won' t require any change. See table 2 below. Different microstep configurations are marked bold Table 2: Configuration of microsteps with //Os TMC2208/A4988TMC2208/A4988 A4988 A4988 TMC2208 MS1 MS2 MS3 Microsteps Microsteps OW high low OW high oo 248 824 high high 16 high high high 16 16 With default settings the TMC2208 will interpolate the microsteps set by the 1/0 configuration pins to 256 microsteps (b)TMC2208 doesnt use third config pin for external microstep configuration, instead this pin offers optional diagnostic function. This is an output pin and should be set as input in the Mcu, leave open if unused (c) INDEX pin is an output pin and should be set as input in the MCu, leave open if unused (d) Analog reference voltage for current scaling or reference current for use of internal sense resistors (optional mode). A voltage between oV and 2. 5V linearly scales the current between 0 and the current scaling defined by the sense resistor setting. Adjust sense resistors to motor current IRMS 325mV IRMS RSENSE+20mQ2 V2 2.5V RE @2018 TRINAMIC Motion Control GmbH Co KG, Hamburg, Germany Terms of delivery and rights to technical change reserved Downloadnewestversionatwww.trinamic.com e Read entire documentation AN45: How to replace Allegro A4988 with TMC2208 Application Note Document Revision V1.3. 201 8-Jan-30 4/5 2 Application Example VMM 正c1F01pF C4,0.1F R3.100k SLEEP 99 VBB2 MS2 OUT UT1A ENABLE OUT2E SENSE1 SENSE2 P7 VREG a)A4988 VMM R3,100k PEN/UART VS C5 C.1uF VCCo CB2 R9,20k IVOUT s GND →RMs=1.15 (b)TMC2208 Figure 1: Stepstick schematic @2018 TRINAMIC Motion Control GmbH Co KG, Hamburg, Germany Terms of delivery and rights to technical change reserved Downloadnewestversionatwww.trinamic.com e Read entire documentation AN45: How to replace Allegro A4988 with TMC2208 Application Note Document Revision V1.3. 201 8-Jan-30 5/5 As an application example a schematic of an StepStick is depicted at the top(subfigure 1 a). The TMC2208 is inserted and used in legacy mode(subfigure 1 b). Recommended changed parts are marked blue. The Pins PDN/UART, INDEX, DIAG, MS2, MS1 feature additional or slightly changed functions as discussed in table 1 The sense resistor should be chosen according to the motor current of the application. Table 3 shows the relation between sense resistor and current for Vref=2.5a after equation 1. for the application example rsense is set to 0. 18Q which allows to control motor currents up to 1. 2A Table 3: Choice of rsense and resulting max. motor current SeNSe RMS current[A], VREF Fitting motor type(examples) 2.5vor open 1.00 0.23 082 0.27 300mA motor 0.75 0.30 0.68 0.33 400mA motor 0.5 0.44 500ma motor 0.47 0.47 0.39 0.56 600ma motor 0.33 0.66 700ma motor 0.27 0.79 800mA motor 0.22 0.96 1 A motor 0.18 1.15 1,2A motor 0.15 35 0.12 1.64 1.5A motor 0.10 1.92* Value exceeds upper current rating, scaling down required, e.g. by reduced VREF @2018 TRINAMIC Motion Control GmbH Co KG, Hamburg, Germany Terms of delivery and rights to technical change reserved Downloadnewestversionatwww.trinamic.com e Read entire documentation AN45: How to replace Allegro A4988 with TMC2208 Application Note Document Revision V1.3. 201 8-Jan-30 5/5 3 Revision History Version Date Author Description V1.0 04.05.2017JPX Inital version V1.1 08052017JPX Reduced size V1.2 10052017JPX Design changes V1.3 30.01.2018Px Correction formular(1) Table 4: Document revision @2018 TRINAMIC Motion Control GmbH Co KG, Hamburg, Germany Terms of delivery and rights to technical change reserved Downloadnewestversionatwww.trinamic.com e Read entire documentation

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