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数据搜索系统，热门电子元器件搜索 |
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ST8034AT 数据表(PDF) 30 Page - STMicroelectronics |
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ST8034AT 数据表(HTML) 30 Page - STMicroelectronics |
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30 / 39 page  DocID024587 Rev 4 31/40 ST8034T, ST8034AT, ST8034P, ST8034C Functional description 6.10 Card supply voltage (VCC) selection 6.10.1 Automatic determining of card supply voltage (VCC) - all versions except ST8034P The supply voltage (VCC) that the card requires is determined automatically by monitoring the duration of the high state on the CMDVCC pin before the activation command CMDVCC falling edge occurs. If the CMDVCC pin stays high for more than 30 ms (tW_VCC), the activation is done with VCC = 5 V. If the CMDVCC pin stays high for less than 15 ms, the activation is done with VCC = 3 V. To activate the card at VCC = 5 V, the CMDVCC pin must stay high for tW_VCC > 30 ms before going low: Figure 16. Card activation to VCC = 5 V (tW_VCC > 30 ms) To activate the card at VCC = 3 V, the CMDVCC pin must stay high for tW_VCC < 15 ms before going low: Figure 17. Card activation to VCC = 3 V (tW_VCC < 15 ms) |
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