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DRV8461SPWPR 数据表(PDF) 56 Page - Texas Instruments |
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DRV8461SPWPR 数据表(HTML) 56 Page - Texas Instruments |
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56 / 117 page  – FAULT bit becomes 0b – UVLO bit stays at 0b – nFAULT pin is pulled high. VRST UVLO reset or VCC UVLO VUVLO rising VUVLO falling Device Status SPI available Digital Alive Outputs switching CP enabled UVLO, FAULT bits 0b* nFAULT high Time VM Voltage SPI available Digital Alive Outputs Hi-Z CP disabled UVLO, FAULT bits 1b nFAULT low SPI unavailable Digital Reset Outputs Hi-Z CP disabled UVLO, FAULT bits 0b nFAULT High SPI available Digital Alive Outputs Hi-Z CP disabled UVLO bit 0b FAULT bit 1b nFAULT low * FAULT bit will be 0b if no fault is present SPI available Digital Alive Outputs switching CP enabled UVLO, FAULT bits 0b* nFAULT high Figure 7-40. Supply Voltage Ramp Profile 7.3.19.2 VCP Undervoltage Lockout (CPUV) If at any time the voltage on the VCP pin falls below the CPUV voltage: • All the outputs are disabled (High-Z) • nFAULT pin is driven low • The charge pump remains active • For the SPI version, the FAULT and CPUV bits are made 1b Normal operation resumes (motor-driver operation and nFAULT released) when the VCP undervoltage condition is removed. The CPUV bit remains at 1b until it is cleared through the CLR_FLT bit or an nSLEEP reset pulse. 7.3.19.3 Logic Supply Power on Reset (POR) If at any time the voltage on the VCC pin falls below the VCCUVLO threshold: • All the outputs are disabled (High-Z) • Charge pump is disabled. VCC UVLO is not reported on the nFAULT pin. Normal motor-driver operation resumes when the VCC undervoltage condition is removed. When device operates with SPI interface: • The NPOR bit is reset and latched 0b once VCC goes above the UVLO threshold. • NPOR remains in reset condition until cleared through the CLR_FLT bit or nSLEEP reset pulse. • After power up, NPOR is automatically latched 1b once the CLR_FLT command is issued. The VCC UVLO scenario is shown in Figure 7-41. DRV8461 SLOSE98 – DECEMBER 2022 www.ti.com 56 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: DRV8461 |
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