3.1 Electric Characteristics
| Function | Signal Name | Pin No | I/O | Signal level | Comments |
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| Power | Vcc | 29 | I | 3.6V to 6V | Ityp = 50mA |
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| Supply |
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| GND | 11, 15, |
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| 6 Ground |
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| 18, 30, |
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| terminals to |
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| 36, 38 |
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| be attached |
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| in parallel |
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| RS232 | UART_TX | 21 | O | VOLmax=0.2V |
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| Interface |
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| VOHmin=2.8V |
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| UART_RX | 25 | I | VILmax=0.8V |
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| VIHmin=2.10V |
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| VIHmax=3.7V |
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| UART_CTS | 19 | I | VILmax=0.8V |
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| VIHmin=2.10V |
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| VIHmax=3.7V |
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| UART_RTS | 23 | O | VOLmax=0.2V |
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| VOHmin=2.8V |
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| UART_DSR | 10 | I | VILmax=0.8V |
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| VIHmin=2.10V |
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| VIHmax=3.7V |
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| UART_DTR | 12 | O | VOLmax=0.2V | Shared with |
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| VOHmin=2.8V | GPIO3 |
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| UART_RI | 6 | I or O | O/P : VOLmax=0.2V | Direction |
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| VOHmin=2.8V | may be |
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| I/P : VILmax=0.8V | programme |
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| VIHmin=2.10V | d. |
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| VIHmax=3.7V |
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| UART_DCD | 8 | I or O | O/P : VOLmax=0.2V | Direction |
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| VOHmin=2.8V | may be |
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| I/P : VILmax=0.8V | programme |
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| VIHmin=2.10V | d. |
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| VIHmax=3.7V |
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| External | VCC_1V8 | 39 | O | 1.8V typical | For |
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| Power |
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| monitoring |
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| Supply |
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| only. No |
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| current |
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| source |
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| VCC_3V3 | 27 | O | 3.3V typical |
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| SPI Bus | SPI_MOSI | 17 | I | VILmax=0.8V | Used to |
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| VIHmin=2.10V | reprogram |
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| VIHmax=3.7V | Flash |
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| SPI_MISO | 5 | O | VOLmax=0.2V |
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| VOHmin=2.8V |
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| SPI_CSB | 7 | I | VILmax=0.8V |
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| VIHmin=2.10V |
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| VIHmax=3.7V |
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| SPI_CLK | 9 | I | VILmax=0.8V |
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