1.7 Hardware interface
Figure 1-6 Hardware Interface
Table 1-2 Definition of Pin assignment
Pin Defined
Pin | Signal Name | I/O | Description | Characteristics |
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1 | VCC | I | DC Supply | DC +3.3V±5% |
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| Voltage input |
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2 | GND | G | Ground | Reference Ground |
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3 | TXA | O | Serial port A | 2.85V ≥ VOH ≥ 2.38V | VOL ≤ 0.7V | ||
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4 | RXA | I | Serial port A | 3.15V ≥ VIH | ≥ 2.0V | - 0.3V ≤ VIL | ≤ 0.86V |
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5 | I/O | General | 3.15V ≥ VIH | ≥ 2.0V | - 0.3V ≤ VIL | ≤ 0.86V | |
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| purpose I/O | 2.85V ≥ VOH | ≥ 2.14V | VOL ≤ 0.71V | |
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6 | VBATT | I | Backup voltage | DC + 2.5 ~ +3.6V |
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| supply | Current ≤ 10uA |
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10
