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TMC5031 Datasheet(PDF) 11 Page - TRINAMIC Motion Control GmbH & Co. KG. |
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TMC5031 Datasheet(HTML) 11 Page - TRINAMIC Motion Control GmbH & Co. KG. |
11 / 63 page TMC5031 DATASHEET (Rev. 1.07 / 2013-APR-30) 11 www.trinamic.com 3.1.1 VCC_IO Requirements For a reliable start-up it is essential that VCC_IO comes up to a minimum of 1.5V before the TMC5031 leaves the reset condition. The reset condition ends earliest 50µs after the time when VSA exceeds its undervoltage threshold of typically 4.2V, or when 5VOUT exceeds its undervoltage threshold of typically 3.5V, whichever comes last. THERE ARE THREE WAYS TO COME UP TO VCC_IO REQUIREMENTS - 5VOUT can be used directly to supply VCC_IO. In this case there are no further requirements. - An external low drop regulator can be used in a 3.3V environment as shown in Figure 3.1. Note, that most voltage regulators are not suitable for this application because they show a delayed boot up. The following external regulators are proved by TRINAMIC: TS3480CX33 This regulator can be used within the full supply voltage range when tied to the motor supply voltage. LD1117-3.3 This regulator can be used to supply VCC_IO from 5VOUT, or from a supply voltage of up to 15V. - VCC_IO can be supplied externally as shown in Figure 3.2 . In this case it is mandatory to connect the Schottky diode to the logic supply of the external circuitry. Please note, that the 2K resistor is not to be used with 5V I/O voltage. 5V Voltage regulator charge pump VCP 22n 100n +VM 5VOUT VSA 4.7µ VCC 100n 470n VCC_IO 2R2 22n +VCC_IO MSS1P3 1K 2K 3.3V, only Figure 3.2 External supply of VCC_IO (showing optional filtering for VCC) Refer to application note no. 028 Supply Voltage Considerations: VCC_IO in TMC50xx Designs (www.trinamic.com). Here you will find complete information about connecting VCC_IO. |
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