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BD63860EFV Datasheet(PDF) 4 Page - Rohm |
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BD63860EFV Datasheet(HTML) 4 Page - Rohm |
4 / 9 page Technical Note 4/8 BD63860EFV www.rohm.com 2012.02 - Rev.A © 2012 ROHM Co., Ltd. All rights reserved. ● Pin descriptions ○ CLK – Clock input terminal for advancing output electrical angle CLK is triggered at the rising edge of the input clock signal. The electrical angle output advances by one step for each CLK pulse input. As the motor may misstep if excessive noise is present on the CLK terminal, the traces leading to this pin should be designed such that noise is kept to a minimum. ○ MODE1, MODE2 – Motor excitation mode terminal Sets the motor excitation mode. Refer to the following table: MODE1 MODE2 Excitation mode L L Full Step H L Half Step A L H Quarter Step H H Eighth Step Refer to pp. 12-13 for the timing chart and motor torque vectors for each excitation mode. Changes to this pin are not synchronized with the CLK input and will reflect immediately in the operation of the IC (refer to p. 16). ○ CW/CCW – Motor rotation direction setting terminal Set the motor’s rotation direction. Changes to this pin are reflected at the rising edge of the next immediate CLK input pulse after the setting is changed (refer to p. 14). CW/CCW Rotation direction L Clockwise (Channel 2 current is output with a 90° phase-lag relative to channel 1) H Counterclockwise (Channel 2 current is output with a 90° phase-lead relative to channel 1) ○ ENABLE – Output enable terminal Forcibly turns off all output transistors (leaving the motor output open). When ENABLE is set to a logic HI, the output electrical angle and operating mode is maintained even if a pulse is input to the CLK pin. However, bear in mind that when the ENABLE signal is switched from HI to LO, the output angle may change depending on whether the CLK input is HI or LO (refer to p. 15). ENABLE Motor output L ACTIVE H OPEN (electrical angle maintained) ○ PS – Power save terminal Switches the IC to standby mode and holds all motor outputs open. Setting the IC to standby mode reinitializes the translator and resets the output angle to the default position (see below). Additionally, when switching from standby to normal mode, a delay of approximately 40μs (max.) occurs before motor output becomes active (refer to p. 11). PS State L Standby mode (reset) H Active mode The default electrical angle for each excitation mode immediately following a reset is as follows (refer to pp. 12-13): Excitation mode Initial electrical angle Full Step 45° Half Step A 45° Quarter Step 45° Eighth Step 45° |
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