2020-03-02 00:56:31 +01:00
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## User Accessible GPIOs (P3)
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2020-02-19 11:08:58 +01:00
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2020-03-02 00:56:31 +01:00
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Helios64 provides 22 GPIOs on header P3 which can be used for user application.
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Those GPIOs are provided via an 16-bit IO Expander [PCA9655E](http://www.onsemi.com/PowerSolutions/product.do?id=PCA9655E) connected to I2C bus 0.
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2020-02-19 11:08:58 +01:00
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2020-03-02 00:56:31 +01:00
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2020-02-19 11:08:58 +01:00
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### Pinout Table
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2020-03-02 00:56:31 +01:00
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| PIN | Port | Remarks |
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|-----|------|-------------|
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| 1 | - | 3.3V Supply |
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| 2 | - | 5V Supply |
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| 3 | - | GND |
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| 4 | EXP_P0_0 | |
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| 5 | EXP_P0_1 | |
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| 6 | EXP_P0_2 | |
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| 7 | EXP_P0_3 | |
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| 8 | EXP_P0_4 | |
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| 9 | EXP_P0_5 | |
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| 10 | EXP_P0_6 | |
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| 11 | EXP_P0_7 | |
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| 12 | EXP_P1_0 | |
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| 13 | EXP_P1_1 | |
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| 14 | EXP_P1_2 | |
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| 15 | EXP_P1_3 | |
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| 16 | EXP_P1_4 | |
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| 17 | EXP_P1_5 | |
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| 18 | EXP_P1_6 | |
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| 19 | EXP_P1_7 | |
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| 20 | - | GND |
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