RX - 8581 SA / JE / NB
3. Terminal description
3.1. Terminal connections
| RX - 8581 SA |
| RX - 8581 JE |
| RX - 8581 NB | ||||||
SOP − 14 pin |
| VSOJ − 20 pin |
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| SON − 22 pin | |||||
# 1 | # 14 | # 1 | # 14 | # 1 |
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| # 14 |
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| # 10 |
| # 11 |
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| # 11 |
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# 7 |
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No. | Pin terminal | No. | Pin terminal |
| No. | Pin terminal | No. | Pin terminal |
| No. | Pin terminal | No. | Pin terminal | |||
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1 | N.C. | 14 | FOUT |
| 1 | N.C. | 20 | N.C. |
| 1 | / INT | 22 | N.C. | |||
2 | SCL | 13 | N.C. |
| 2 | N.C. | 19 | N.C. |
| 2 | GND | 21 | N.C. | |||
3 | SDA | 12 | N.C. |
| 3 | FOE | 18 | N.C. |
| 3 | ( VDD ) | 20 | N.C. | |||
4 | N.C. | 11 | VDD |
| 4 | VDD | 17 | N.C. |
| 4 | N.C. | 19 | N.C. | |||
5 | GND | 10 | FOE |
| 5 | FOUT | 16 | N.C. |
| 5 | SDA | 18 | N.C. | |||
6 | N.C. | 9 | N.C. |
| 6 | SCL | 15 | N.C. |
| 6 | SCL | 17 | N.C. | |||
7 | / INT | 8 | N.C. |
| 7 | SDAT | 14 | N.C. |
| 7 | FOUT | 16 | N.C. | |||
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| 8 | ( VDD ) | 13 | N.C. |
| 8 | VDD | 15 | N.C. | |||
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| 9 | GND | 12 | N.C. |
| 9 | FOE | 14 | N.C. | |||
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| 10 | / INT | 11 | N.C. |
| 10 | N.C. | (13) | − | |||
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| 11 | N.C. | (12) | − | |||
3.2. Pin Functions
| Signal | I/O | Function | |
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SCL | I | This is the serial clock input pin for I2C Bus communications. | |
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| This pin's signal is used for input and output of address, data, and ACK bits, | |
| SDA | I/O | synchronized with the serial clock used for I2C communications. | |
Since the SDA pin is an | |||
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FOUT | O | When FOE = "H" (high level), this pin outputs a | |
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| When output is stopped, the FOUT pin = "L" (low level). | |
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| This is an input pin used to control the output mode of the FOUT pin. | |
| FOE | I | When this pin's level is high, the FOUT pin is in output mode. When it is low, output via the | |
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| FOUT pin is stopped. | |
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| /INT | O | This pins is used to output alarm signals, timer signals, time update signals, and other | |
| signals. This pin is an open drain pin. | |||
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VDD | − | This pin is connected to a positive power supply. | |
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| (VDD) | − | Although this pin has the same potential as VDD, it should not be connected externally. | |
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| GND | − | This pin is connected to a ground. | |
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| This pin is not connected to the internal IC. | |
| N.C. | − | Leave N.C. pins open or connect them to GND or VDD. | |
(Note) Note with caution that in the | |||
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| 22) are interconnected via the internal frame. | |
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Note: Be sure to connect a bypass capacitor rated at least 0.1 µF between VDD and GND.
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