Datasheet TB9120AFTG (Toshiba) - 6
| Manufacturer | Toshiba |
| Description | Bipolar stepping motor driver with a clock input interface for automotive applications |
| Pages / Page | 50 / 6 — TB9120AFTG. 7 Description of operation. 7.1 BSTBY Function |
| File Format / Size | PDF / 3.0 Mb |
| Document Language | English |
TB9120AFTG. 7 Description of operation. 7.1 BSTBY Function
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TB9120AFTG 7 Description of operation 7.1 BSTBY Function
When BSTBY=L, the IC is kept in the standby mode. BSTBY Function Standby mode L (Internal oscillator circuits, OSCS and OSCM stop and operation of output MOSFETs to drive a motor stops) H Active mode Note: 0.5ms at the most is required so that the internal circuit related to 5V in the IC becomes stable right after switching from the standby mode state to the active mode. Refer to 7.2. Truth table Input Output state Mode CLK CW/CCW START ENABLE BSTBY H L H H CW (Clockwise) Normal operation L L H H CCW (Counterclockwise) Normal operation X X H H H Initialization of electrical angle Initial (Note 1) X X X L H High-impedance Enable OFF (Note 2) X X X X L High-impedance Standby (Note 3) X: Don’t care. Note 1. Initial: The current level that is fixed to the initial electrical angle indicated by the function of START is output. Note 2. Enable OFF: The outputs enter a high-impedance state. On the other hand, when START=L and a signal is being input to CLK, the internal counter proceeds. Note 3. Standby: BSTBY has higher priority than ENABLE. Therefore, regardless of a state of ENABLE, if BSTBY=L, the IC becomes a standby mode. © 2020 6 2020-05-12 Toshiba Electronic Devices & Storage Corporation
When BSTBY=L, the IC is kept in the standby mode. BSTBY Function Standby mode L (Internal oscillator circuits, OSCS and OSCM stop and operation of output MOSFETs to drive a motor stops) H Active mode Note: 0.5ms at the most is required so that the internal circuit related to 5V in the IC becomes stable right after switching from the standby mode state to the active mode. Refer to 7.2. Truth table Input Output state Mode CLK CW/CCW START ENABLE BSTBY H L H H CW (Clockwise) Normal operation L L H H CCW (Counterclockwise) Normal operation X X H H H Initialization of electrical angle Initial (Note 1) X X X L H High-impedance Enable OFF (Note 2) X X X X L High-impedance Standby (Note 3) X: Don’t care. Note 1. Initial: The current level that is fixed to the initial electrical angle indicated by the function of START is output. Note 2. Enable OFF: The outputs enter a high-impedance state. On the other hand, when START=L and a signal is being input to CLK, the internal counter proceeds. Note 3. Standby: BSTBY has higher priority than ENABLE. Therefore, regardless of a state of ENABLE, if BSTBY=L, the IC becomes a standby mode. © 2020 6 2020-05-12 Toshiba Electronic Devices & Storage Corporation
